TW202042405A - Dielectric ceramic material composition for capacitor applications for effectively improving insulation characteristics, capacitance temperature characteristics and stability to an electric field of DC bias - Google Patents

Abstract

The present invention provides a dielectric ceramic material composition for capacitor applications, especially application to a laminated ceramic capacitor used in the base metal electrode manufacturing process, comprising a primary component of BaTiO3 and at least one secondary component of Sc2O3. By controlling an addition amount of Sc2O3, the property of BaTiO3 is modified. In a process of sintering reaction, the addition of Sc2O3 allows BaTiO3 to produce a core-shell structure, which has the effect of inhibiting growth of BaTiO3 crystalline grains and effectively improves insulation characteristics, capacitance temperature characteristics and stability to an electric field of DC bias. And, MgO can be appropriately added to improve the stabilization of the TCC curve in the range of -55 DEG C to 25 DEG C. Since the composition of the additives is simple and the content thereof is relatively low, the production process can be simplified and the usage amount of Sc2O3 is reduced in obtaining a dielectric ceramic material that meets the EIA-X8R specification at a low cost and can be used in base metal electrode manufacturing process for laminated ceramic capacitors.

Description

The composition of dielectric ceramic materials used in capacitors

The present invention provides a dielectric ceramic material meet EIA-X8R specification can be applied to a base metal of an electrode manufacturing process, especially the control Sc ₂ O ₃ is added in an amount of BaTiO ₃ by reforming the produced BaTiO ₃ core - shell structure In order to improve the dielectric properties of BaTiO ₃ to the application temperature and the stability of the DC bias voltage field, and to reduce the amount of Sc ₂ O ₃ used to reduce costs, it is also very industrially applicable.

With the advancement and rapid development of science and technology, capacitors are moving towards miniaturization, high capacitance, high stability and reliability, etc., and are transformed from traditional capacitors to chip-type multilayer ceramic capacitors (MLCCs). This type of capacitor not only reduces the volume of the capacitor and increases the capacitance, but also reduces the production cost, making the multilayer ceramic capacitor the most widely used and most widely used electronic component among electronic components. The Electronic Industries Association of America (EIA) broadly summarizes capacitors into two categories: temperature-compensated capacitors and medium-to-high dielectric value capacitors based on different ranges of use and electrical characteristics. Among them, X7R (-55°C to 125°C, △C/C≦±15%) standard multilayer ceramic capacitors have multiple electrical characteristics and can meet the application temperature range of most consumer electronic products, so they are widely used in various Among the types of electronic products: In recent years, the application of automotive electronic products has developed rapidly and the requirements for safety have become more stringent, so X7R multilayer ceramic capacitors are not enough to cope with such a harsh operating environment. Based on safety considerations, X8R (-55°C to 150°C, △C/C≦±15%) high-end multilayer ceramic capacitors with temperature stability have received high attention.

Furthermore, as the technology in the field of capacitors matures, the areas that can be changed in the capacitor structure tend to be limited. Therefore, most of them are adjusted for the composition ratio and dielectric characteristics of the dielectric ceramic materials to meet the expectations. It can meet the X8R specification and have the characteristics of high dielectric constant. Generally, the manufacturing process of multilayer ceramic capacitors is divided into internal electrodes, which can be divided into precious metal manufacturing processes and base metal manufacturing processes. Among them, the precious metal manufacturing process often uses silver/palladium alloy as internal electrodes. Such rare metals are expensive and their derived products have extremely high costs. Therefore, based on cost considerations, nowadays, cheaper base metal processes are mostly used. The internal electrode material of the base metal electrode manufacturing process is copper (Cu) or nickel (Ni) metals that are easily oxidized, so sintering in a reducing atmosphere is required. However, sintering in a reducing atmosphere will cause the dielectric ceramic material to deoxidize, which will degrade the insulating properties of the multilayer ceramic capacitor. Therefore, a stable dielectric ceramic material formulation is not easy to achieve.

In addition, in the development of the X8R standard multilayer ceramic capacitors, the main direction is the barium titanate ceramic substrate with higher dielectric constant, and the addition of various modifiers, grain growth inhibitors, sintering accelerators, etc. Barium titanate is modified to improve the stability of dielectric properties and sinterability of dielectric ceramic materials. The related prior art has disclosed a method for preparing dielectric ceramic mixtures. Please refer to the Republic of China Invention Publication No. TW201044427A. Using BaTiO ₃ as the main component, and doping with different proportions of Sc ₂ O ₃ , MgCO ₃ , BaSiO ₃ , MnCO ₃ , La ₂ O ₃ , Co ₃ O ₄ and NiO and other additives for uniform mixing to prepare a X8R standard dielectric ceramics with better compactness, but in order to achieve the stability of the dielectric characteristics of the dielectric ceramics in accordance with the X8R standard, a considerable proportion (that is, more than 1.00 mol%, but less than 4.00 mol%) Expensive Sc ₂ O ₃ components result in extremely high production costs, which makes its industrial applicability poor. To reduce the content of Sc ₂ O ₃ and achieve stable dielectric properties, additional oxygen compounds that are not easily available (such as La ₂ O ₃ , Co ₃ O ₄ or NiO, etc.), thereby increasing the complexity of the material formulation composition, material control and production costs, and the risk of manufacturing variability. In addition, there is another prior art in order to meet the X8R specification by adding different main components or complex sub-components to modify, so that the TCC curve near the Curie temperature or the high temperature end range (25°C to 150°C) can achieve a gradually flattening purpose. Unfortunately, the TCC curve at the low temperature end (such as room temperature or -55℃ to 25℃) is abnormally steep or fluctuates too much, and the excellent and gentle characteristics of the TCC curve below room temperature are severely lost. This modification method takes care of the other, and is also manufacturing The problems caused by the difficulty of controlling variability need to be solved effectively by those engaged in this industry to study and improve.

Therefore, the inventor considers that the above-prepared dielectric ceramics are modified by adding Sc ₂ O ₃ to modify BaTiO ₃ , and it is necessary to add a considerable proportion of expensive Sc ₂ O ₃ , which leads to high production costs and not commercial competitiveness. If the content of Sc ₂ O ₃ is reduced, additional compounds such as La ₂ O ₃ , Co ₃ O ₄ and NiO must be added, thus increasing the composition complexity, cost, and manufacturing variability of the material formulation. . After collecting relevant information, after many evaluations and considerations, and using years of research and development experience in this industry, the invention patent of the dielectric ceramic material composition that can be applied to the base metal electrode process was born.

The main purpose of the present invention is that the multilayer ceramic capacitor prepared in the examples is to modify the BaTiO ₃ by controlling the addition amount of Sc ₂ O ₃ , and during the sintering reaction, the addition of the Sc ₂ O ₃ component can be The BaTiO ₃ produces a core-shell structure, which has the effect of inhibiting the growth of BaTiO ₃ grains and effectively improves its insulation properties and dielectric temperature stability. The ratio of Sc ₂ O ₃ to BaTiO _{3 added} per 100 mol is 0.30~1.00 mol, and 0~2.00 mol of MgO can be added appropriately. For TCC in the range of -55℃ to 25℃ The curve has the effect of strengthening stabilization. Because the additive composition of the material ratio is simple and the content is sparse, it can reduce the amount of Sc ₂ O ₃ used, the cost and the risk of manufacturing variability, and then it can be applied to base metals Electrode manufacturing process and dielectric ceramic materials that meet EIA-X8R specifications.

The secondary objective of the present invention is that the dielectric ceramic material used in the above-mentioned multilayer ceramic capacitor is optimally BaTiO ₃ co-doped with 0.45 mol% Sc ₂ O ₃ and 1.00 mol% MgO, and the dielectric ceramic material is between -55 ℃ and 150 ℃. The rate of change of the electrical constant is maintained within the range of ±10%, which complies with the EIA-X8R specification and can be applied to the base metal electrode process. The dielectric constant is 1744, the dielectric loss is 0.58%, and the TCC at -55°C is -3.9%. And 150℃ TCC is -8.5%, room temperature resistivity reaches 2.8×10 ¹² Ω-cm and high temperature 150℃ resistivity reaches 1.7×10 ¹¹ Ω-cm, which can effectively improve the stability of the dielectric temperature characteristics of multilayer ceramic capacitors It also has good insulation properties.

[Figure 1] is a flow chart of the production of multilayer ceramic capacitors of the embodiment of the present invention using dielectric ceramic materials.

[Figure 2] is a data table (1) of the ratio parameters and dielectric properties of the dielectric ceramic materials used in the embodiment of the present invention.

[Figure 3] is the dielectric temperature characteristic measurement diagram (1) of the embodiment of the present invention.

[Figure 4] is a data table (2) of the ratio parameters and dielectric properties of the dielectric ceramic materials used in the embodiment of the present invention.

[Figure 5] is the dielectric temperature characteristic measurement diagram (2) of the embodiment of the present invention.

In order to achieve the above-mentioned purpose and effect, the technical means and structure adopted by the present invention are illustrated in detail below to explain the structure and function of the preferred embodiment of the present invention in order to fully understand.

Please refer to Figure 1, which is a manufacturing flow chart of the multilayer ceramic capacitor of the embodiment of the invention using dielectric ceramic materials. It can be clearly seen from the figure that the method of manufacturing the multilayer ceramic capacitor of the embodiment of the invention It is implemented according to the following steps, but the method of preparation in actual application is not limited to this, as long as any method of preparing multilayer ceramic capacitors known to those with ordinary knowledge in the field can be used, and includes other types Application products of related ceramic capacitors. The method of manufacturing a multilayer ceramic capacitor of the embodiment of the present invention includes the following steps:

(101) Mix the main component and the secondary component powder according to the composition ratio to prepare a ceramic slurry.

(102) Preparation of ceramic thin tape.

(103) Screen printing electrode pattern.

(104) Preparation of laminated ceramic green embryo.

(105) Oxidative heat treatment burns out organic matter.

(106) Sintering in a reducing atmosphere.

(107) Re-oxidation heat treatment.

(108) Prepare external electrodes.

(109) Electrical measurement.

It can be known from the above implementation steps that the step is to first heat high purity (>99%) barium titanate (BaTiO ₃ ) powder in the air at a heating rate of 5°C/min to 115 0°C for 4 hours, as Initial BaTiO ₃ powder. Then the main component contains BaTiO ₃ powder, 0.05 mol% of manganese carbonate (MnCO ₃ ), 1.37 mol% of barium silicate (BaSiO ₃ ), and at least one secondary component containing 0.30 to 1.00 mol% of scandium oxide (Sc ₂ O ₃₎ ) And 0~2.00mol% of magnesium oxide (MgO) are mixed according to the composition ratio, then toluene, absolute alcohol, binder, dispersant and plasticizer are added, and zirconia balls are used to grind and mix uniformly to prepare ceramic slurry The ceramic paste can be scraped into a thin ceramic ribbon, and the electrode pattern of the metal containing nickel (Ni), copper (Cu), silver (Ag) or palladium (Pd) can be printed by screen printing. It is made on the ceramic thin ribbon, and then the ceramic thin ribbon is stacked in a staggered manner and hot-pressed to form a compact laminated ceramic green embryo, which can be cut according to the designed laminated ceramic capacitor size.

Before sintering, the laminated ceramic green embryos are oxidized and heat treated at 350°C~550°C for 4 hours (heating and cooling rates are maintained at 2°C/min) in a pure nitrogen (N ₂ ) atmosphere to burn out the laminate The organic matter previously added to the ceramic green embryo is then sintered for 2 hours at 1200℃~1300℃ in a reducing atmosphere composed of 97% pure nitrogen, 3% hydrogen (H ₂ ) and 35℃ saturated steam. (The heating and cooling rate is maintained at 5°C/min), and then all burned samples are placed in a low oxygen partial pressure atmosphere composed of pure nitrogen and 35°C saturated steam at 950°C for 2 hours, and slowly After cooling down to room temperature, a laminated ceramic cooked embryo is obtained.

Continue to coat the outer electrode containing Cu electrode paint on the two ends of the laminated ceramic cooked green blank by dipping, and contact the inner Ni electrode, then the outer electrode is sintered at 900°C in a pure nitrogen atmosphere and combined with the inner Ni electrode. Finally, Ni and Sn (tin) are electroplated on the two-terminal Cu electrodes of the semi-finished multilayer ceramic capacitor to complete the preparation of all the samples in each embodiment in the following specification. After the preparation of the samples is completed, use a scanning electron microscope ( SEM), transmission electron microscope (TEM) and X-ray diffractometer (XRD) to observe the multilayer ceramic The microstructure of the container, and the dielectric characteristics of multilayer ceramic capacitors are measured using an inductance capacitance resistance (TLC) measuring instrument.

Please refer to Figures 2 to 3, which are the data sheet (1) and the dielectric temperature characteristic measurement diagram of the embodiment (1) of the dielectric ceramic material ratio parameters and dielectric characteristics used in the embodiment of the present invention. It can be clearly seen from the figure that the dielectric ceramic materials used in the above-mentioned multilayer ceramic capacitors of the present invention are mainly composed of BaTiO ₃ , 0.05 mol% MnCO ₃ , and 1.37 mol% BaSiO ₃ as the main components, but in practical applications, it can also be appropriate Add other compounds mixed with BaTiO ₃ , and add different content of Sc ₂ O ₃ (0.30~0.60mol%) and MgO (0~2.00mol%) as secondary components to modify BaTiO ₃ from the main component.

When the cross section was observed using an SEM microstructure of the laminated ceramic capacitor of the embodiment when the respective embodiments, may be added in an amount found to 0.30mol% Sc ₂ O ₃ of the multilayer ceramic capacitor as compared to the addition amount 0.60mol% Sc ₂ O ₃ ceramic laminate of Capacitors have fewer porosity and higher sintered density. With the increase of Sc ₂ O ₃ addition, although the grain size of BaTiO ₃ can be refined and the grain size can be more uniform, it tends to suppress the grain boundary migration rate of BaTiO ₃ during the sintering reaction process, so excessive The addition of Sc ₂ O ₃ will cause the density of BaTiO ₃ to decrease and the sintering densification temperature to increase. Due to the shrinking of BaTiO ₃ grain size, with the increase of Sc ₂ O ₃ addition, the dielectric constant and dielectric constant of BaTiO ₃ The electrical loss will also decrease, and its insulating properties will have a significant improvement effect due to the increase in the specific surface area of the crystal grains. Further observe the TCC curve between 0.30mol% to 0.60mol% of the added amount of Sc ₂ O _3, may be found with increasing amount of added ₂ O ₃ Sc, TCC curves for the stability of the BaTiO ₃ has a significant benefit.

In order to understand the influence of different Sc ₂ O ₃ additions on the crystal structure and dielectric properties of BaTiO ₃ in the microstructure of multilayer ceramic capacitors, TEM observation shows that when the addition of Sc ₂ O ₃ increases to 0.45 mol% or more, BaTiO The crystal grains of ₃ produce a core-shell structure with uneven chemical composition. By using energy dispersive X spectrometer (EDS) to analyze the composition of the grains, it can be found that the outer shell of the grain has a higher content of scandium (Sc) element (>1.0at%), while the core of the grain has a lower content of scandium. (Sc) element (<0.5at%), this phenomenon is due to the concentration gradient difference caused by the low diffusion rate of Sc element. The higher content of Sc element leads to the generation of nuclei with concentration gradient at the crystal grains of BaTiO ₃ -Shell structure, and the crystal grain shell has a low squareness, which is a paraelectric state similar to a cubic crystal structure, while the crystal grain core has a high squareness and a spontaneously polarized ferroelectric square crystal structure. In addition, the diffusion rate of Mg element is relatively fast, so there is not much difference in the content of Mg element in the grain shell and the grain core. However, when the amount of Sc ₂ O ₃ added reached 0.30 mol%, no core-shell structure with uneven chemical composition was found in the crystal grains.

As shown in Figures 2 to 3, the dielectric properties of multilayer ceramic capacitors with different contents of Sc ₂ O ₃ and MgO sintered in a reducing atmosphere are listed, and the temperature coefficient of capacitance (TCC) and temperature are plotted. The relationship curve shows that when BaTiO _{3 is} added with Sc ₂ O ₃ from 0.30mol%, the TCC curve in the range of -55℃ to 150℃ can become flatter, especially when the addition amount is 0.45mol%. And 0.60mol% Sc ₂ O ₃ multilayer ceramic capacitors. When the addition amount of MgO is 1.00 mol%, the TCC curve from -55°C to 25°C has an enhanced stabilization effect. Therefore, the addition of Sc ₂ O ₃ has a good stabilizing effect on the dielectric temperature characteristics of BaTiO ₃ . In particular, the influence of the TCC curve from 25°C to 150°C is more obvious.

Furthermore, when the addition amount of Sc ₂ O ₃ is 0.45 mol% and 0.60 mol%, the dielectric constant is 1744 and 1675, the dielectric loss (tanδ) is 0.58%, 0.59%, and the measurement temperature is -55 The TCC at ℃ is -3.9%, -2.1%, and the TCC at 150℃ is -8.5%, -11.6%, and the resistivity at room temperature 25℃ is 2.8×10 ¹² Ω-cm, 3.3×10 ¹² Ω- The resistivity of cm and high temperature 150℃ reach 1.7×10 ¹¹ Ω-cm and 4.3×10 ¹¹ Ω-cm respectively. The TCC curves of all relevant composition ratios can meet the application specifications defined by EIA-X8R, and have good Insulation characteristics.

In this embodiment, the dielectric ceramic materials used in the above multilayer ceramic capacitors are doped with 0.45mol% Sc ₂ O ₃ and 1.00mol% MgO to have the best dielectric properties, and the measurement temperature is -55℃ to 150℃ The rate of change of the dielectric constant (K value) of the interval is maintained within ±10%, which conforms to the EIA-X8R specification. The dielectric constant is 1744, the dielectric loss (tanδ) is 0.58%, and the measurement temperature is -55℃. The TCC is -3.9% and the TCC at 150°C is -8.5%, the resistivity at 25°C at room temperature reaches 2.8×10 ¹² Ω-cm and the resistivity at 150°C at high temperature reaches 1.7×10 ¹¹ Ω-cm. However, the multilayer ceramic capacitor prepared in the embodiment of the present invention uses the control of the addition amount of Sc ₂ O ₃ to modify the BaTiO ₃ substrate, so that the BaTiO ₃ grains have a core-shell structure, and Sc ₂ O ₃ is in the process of the sintering reaction. _{The addition of 2} O ₃ has the effect of inhibiting the growth of BaTiO ₃ grains, and can effectively improve its insulation properties. Because the amount of Sc ₂ O ₃ added is very small and not more than 1.00 mol%, the composition of the material components is simple and the content is rare , Which can simplify the production process and reduce the amount of Sc ₂ O ₃ used to obtain a dielectric ceramic material composition that is applied to the base metal electrode process and meets the EIA-X8R specification at a low cost.

Please refer to Figures 4 to 5 at the same time, which are the data table (2) of the dielectric ceramic material ratio parameters and dielectric characteristics used in the embodiment of the present invention and the measurement diagram of the dielectric temperature characteristics of the embodiment (2) ), it can be clearly seen from the figure that when the addition amount of Sc ₂ O ₃ is between 0.60mol% and 1.00mol%, even if it is a multilayer ceramic capacitor with 0mol% MgO added, all relevant composition ratios of TCC The curves can all meet the application specifications defined by EIA-X8R. Adding more than 0.45 mol% of Sc ₂ O ₃ can produce a core-shell structure in the BaTiO ₃ grains, and can effectively suppress the peak of the TCC curve within the measurement temperature range of -55°C to 150°C. The addition of MgO has the effect of strengthening the stabilization of the TCC curve in the range of -55℃ to 25℃. When the addition amount of MgO is between 0.50mol% and 2.00mol%, it has the same trend of influence. The dielectric loss (tanδ) of ceramic capacitors dropped sharply from 0.76% of 0mol% MgO to 0.56% of 2.00mol% MgO. Obviously, the added content of Sc ₂ O ₃ is a key element for the stability of the dielectric constant, TCC curve and other dielectric temperature characteristics of multilayer ceramic capacitors, and the presence of MgO is beneficial to increase the density of BaTiO ₃ and reduce the dielectric Electricity loss, and increase the low temperature (-55℃) TCC value (from -2.1% to -0.2%). Especially when Sc ₂ O ₃ reaches 0.60 mol% or more, the influence of different content of MgO on the TCC curve will become quite insignificant. This also shows that the addition of Sc ₂ O ₃ improves the dielectric properties of BaTiO ₃ The stability of temperature also improves the stability of BaTiO ₃ to chemical composition. It can be seen that the content of the present invention is extremely valuable for industrial applicability.

In other words, the inventors considered that the prior art hindered the preparation of dielectric ceramics because of the difficulties in modifying BaTiO ₃ by adding Sc ₂ O ₃ , especially adding La ₂ O ₃ , Co ₃ O ₄ or NiO. Compounds cause manufacturing variability problems, etc., so we actively researched the use of small amounts of Sc ₂ O ₃ (0.3~1.00mol%) and MgO elements (0~2.0mol%), and through clever control of the microscopic diffusion behavior in the crystal lattice, the production The process is simplified and finally meets the X8R specification requirements. When Sc ₂ O _{3 is} between 0.45 and 1.00 mol%, BaTiO ₃ grains can form a core-shell structure with a concentration gradient and have stable dielectric properties. Taking Sc ₂ O ₃ as 0.60 mol% as an example, no matter how much MgO is added, the overall TCC curve has an almost overlapping trend in the temperature range of -55℃~150℃. If you further examine the low temperature end of the TCC curve (-55℃ to 25°C) or the high temperature end (25°C to 150°C) is an excellent smooth curve. Conversely, when the Sc ₂ O _{3 is} less than 0.45 mol%, because the crystal grains do not form a core-shell structure with a concentration gradient, the composition ratio between the trace Sc ₂ O ₃ and MgO must be skillfully controlled to successfully meet the X8R specification Taking Sc ₂ O ₃ as 0.30mol% as an example, because the addition of MgO has a stabilizing effect on the TCC curve between -55℃ and 25℃, this result smoothly makes the dielectric ceramic conform to the X8R specification, and its dielectric constant is even higher. Other core-shell structures with a concentration gradient are excellent. In addition, the present invention is not limited to the experimental values of the various graphs or data tables disclosed above. In particular, those in the field can "extrapolate" the relationship between the data obtained in the present invention by using statistical logic or trend derivation. It is further calculated that those that are not recorded in the specific experimental values of the present invention, but whose effects still do not deviate from the technical solution or scope of the present invention, for example: the extrapolation method is used to find that the trace amount of Sc ₂ O ₃ is controlled down to 0.05 mol%. Will have the same effect. Therefore, even though the present invention does not propose specific test values, nor has it elaborated on these test values in depth, but mastering the subtle control relationship of Sc ₂ O ₃ or MgO and supplementing common scientific methods such as extrapolation, the results derived are still consistent. It belongs to the technical scheme or category of the present invention.

Compared with the dielectric ceramic materials used in the prior art, the dielectric ceramic material provided by the present invention has the following advantages:

(1) The dielectric ceramic material used in the multilayer ceramic capacitor prepared in the embodiment of the present invention is made of BaTiO ₃ as the main component, and different content of Sc ₂ O ₃ (0.30~1.00 mol%) is added as a secondary component to BaTiO ₃ Modification, in the process of sintering reaction, Sc ₂ O ₃ can not only make the BaTiO ₃ grain size finer and more uniform, and with the addition of Sc ₂ O _{3, it} can inhibit the growth of BaTiO ₃ grains and effectively improve it. Its insulating properties. When Sc ₂ O ₃ reaches 0.45 mol% or more, it can form a core-shell structure with a concentration gradient and greatly improve the stability of the TCC curve of BaTiO ₃ at -55°C to 150°C, as well as all relevant composition ratios. All of the TCC curves can meet the application specifications of EIA-X8R.

(B) of the present invention, the above-described dielectric ceramic material used in the laminated ceramic capacitor may be formed in addition to BaTiO ₃ was added different amounts of Sc ₂ O ₃ for a modified pair of BaTiO _3, may also be appropriately added MgO (0 ~ 2.00mol%), for - The TCC curve in the range of 55°C to 25°C has an enhanced stabilization effect. The composition of this dielectric ceramic material is simple and the content is rare. It can not only reduce the amount of Sc ₂ O ₃ used, but also does not require additional addition Compounds such as La ₂ O ₃ , Co ₃ O ₄ and NiO can effectively reduce the compositional complexity, cost and manufacturing variability of the material formulation, and then be applied to the base metal electrode process and meet the EIA-X8R specification. Electric ceramic materials.

(3) The best dielectric ceramic material used in the present invention is BaTiO ₃ co-doped with 0.45 mol% Sc ₂ O ₃ and 1.00 mol% MgO, with a dielectric constant of 1744, a dielectric loss of 0.58%, and a temperature of -55℃ TCC is -3.9% and 150℃ TCC is -8.5%, room temperature resistivity reaches 2.8×10 ¹² Ω-cm and high temperature 150℃ resistivity reaches 1.7×10 ¹¹ Ω-cm, which can effectively improve the dielectric properties of multilayer ceramic capacitors. Stability of electrical temperature characteristics.

The above detailed description is for a preferred and feasible embodiment of the present invention. However, the embodiment is not intended to limit the scope of the patent application of the present invention. All other equal changes and modifications made without departing from the spirit of the technique disclosed in the present invention All changes shall be included in the scope of patent covered by the present invention.

In summary, the composition of the dielectric ceramic material used in the capacitor application of the present invention can indeed achieve its efficacy and purpose when used. Therefore, the present invention is truly an invention with excellent practicability, and it actually meets the requirements of an invention patent application. The application is filed, and I hope that the review committee will grant this case as soon as possible to protect the inventor’s hard work. If there is any doubt, please send me instructions. The inventor will do his best to cooperate and feel good.

Claims (9)

A composition of dielectric ceramic materials used in capacitors, especially multilayer ceramic capacitors used in the base metal electrode manufacturing process, including: One main ingredient contains BaTiO ₃ ; and The two secondary components include Sc ₂ O ₃ and MgO. The content ratio of the first secondary component Sc ₂ O ₃ to the main component BaTiO ₃ per 100 mol is between 0.30 and 1.00 mol. The content ratio of the second sub-component MgO to the main component BaTiO ₃ per 100 mol is between 0.10 and 2.00 mol. The main component and the sub-component are sintered through the base metal electrode process to form a grain structure It contains a core-shell structure (Core-Shell Structure). A composition of dielectric ceramic materials used in capacitors, especially multilayer ceramic capacitors used in the base metal electrode manufacturing process, including: The main components include BaTiO ₃ and MnCO ₃ ; and A secondary component Sc ₂ O ₃ , wherein the content ratio of the secondary component Sc ₂ O ₃ to the main component BaTiO ₃ per 100 mol is between 0.30 and 1.00 mol, and the primary component and the secondary component pass The grain structure formed by sintering the base metal electrode process contains a core-shell structure. A composition of dielectric ceramic materials used in capacitors, especially multilayer ceramic capacitors used in the base metal electrode manufacturing process, including: The main components include BaTiO ₃ and BaSiO ₃ ; and A secondary component Sc ₂ O ₃ , wherein the content ratio of the secondary component Sc ₂ O ₃ to the main component BaTiO ₃ per 100 mol is between 0.30 and 1.00 mol, and the primary component and the secondary component pass The grain structure formed by sintering the base metal electrode process contains a core-shell structure. A composition of dielectric ceramic materials used in capacitors, especially multilayer ceramic capacitors used in the base metal electrode manufacturing process, including: The main components include BaTiO ₃ , MnCO ₃ , BaSiO ₃ ; and A secondary component Sc ₂ O ₃ , wherein the content ratio of the secondary component Sc ₂ O ₃ to the main component BaTiO ₃ per 100 mol is between 0.30 and 1.00 mol, and the primary component and the secondary component pass The grain structure formed by sintering the base metal electrode process contains a core-shell structure. A composition of dielectric ceramic materials used in capacitors, especially multilayer ceramic capacitors used in the base metal electrode manufacturing process, including: A core-shell structure (Core-Shell Structure) grain structure is formed by sintering the main component BaTiO ₃ and the secondary component Sc ₂ O ₃ through a base metal electrode process. The secondary component Sc ₂ O _{3 is} relative to the main component The content ratio of BaTiO _{3 added} per 100 mol is between 0.30 and 1.00 mol. The composition of the dielectric ceramic material used in the capacitor according to claim 5, wherein the outer shell and the inner core of the core-shell structure (Core-Shell Structure) grain structure contain scandium (Sc) element, and scandium (Sc) element The concentration gradient is that the shell is larger than the inner core. The composition of the dielectric ceramic material used in the capacitor according to claim 6, wherein the outer shell of the core-shell structure (Core-Shell Structure) grain structure contains more than 1.0at% of scandium (Sc) element, and the core contains 0.5at% The following scandium (Sc) element. The dielectric ceramic material composition for capacitor applications according to any one of claims 1 to 7, wherein the content of the first secondary component Sc ₂ O ₃ is between 0.45 and 1.00 mol. The composition of the dielectric ceramic material used in the capacitor according to claim 8, wherein the TCC curve of the dielectric ceramic complies with the EIA-X8R specification.

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