JPH03145114A - Porcelain capacitor and manufacture thereof - Google Patents

Abstract

PURPOSE:To enhance the permitting of the title porcelain capacitor by a method wherein the fundamental component is composed of themetal oxide of Ba and Ca or Sr and Ti in which porcelain is indicated by a specific chemical formula, Cr2O3 or Al2O3 is used as the first additive substance, three-component type Li2O1, SiO2 and a specific metal oxide which is in specific compositional range are used as the second additive substance. CONSTITUTION:The title porcelain capacitor is composed of the fundamental component of porcelain of 100.0 pts. wt., the first additive component of 0.01 to 3.00 pts. wt., and the second additive component of 0.2 to 5.0 pts. wt. The fundamental component consists of (Bak-xMx)OkTiO2 (provided that M indicates the metal containing one or more kinds selected from Ca and Sr, (k) indicates the value within the range of 1.00 to 1.05, and (x) indicates the value within the range of 0.01 to 0.05) the first additive substance is the metal oxide containing one or more kinds selected from Cr2O3 and Al2O3, and the second additive substance contains Li2O, SiO3 and MO (provided that MO indicates the metal containing one or more kinds selected from BaO, SrO, CaO, MgO and ZnO. Also, the range of composition of the above-mentioned material is to be within the region surrounded by the line linking points A, B, C, D and E, shown in the triangular diagram separately mentioned, successively. As a result, a porcelain capacitor having high permittivity can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a ceramic capacitor having a single-layer or laminated structure consisting of dielectric ceramic and at least two electrodes, and a method for manufacturing the same.

[Prior art] Conventionally, when manufacturing multilayer ceramic capacitors, a conductive paste of noble metal such as platinum or palladium is printed in a desired pattern on a green sheet (unsintered ceramic sheet) made of dielectric magnetic H raw material powder. A plurality of these sheets were stacked and pressed together, and sintered in an oxidizing atmosphere at 1300°C to 1600°C. As a result, the dielectric ceramic and the internal electrode can be obtained at the same time.

As mentioned above, if a noble metal is used, the intended internal electrode can be obtained even if it is sintered at high temperature in an oxidizing atmosphere. However, since precious metals such as platinum and palladium are expensive, the cost of multilayer ceramic capacitors has inevitably increased.

As a solution to the above-mentioned problem, Japanese Patent Publication No. 14607/1987, filed by the applicant, describes (Bak-x M,) OkTiO2 (where M is at least one of Mg and Zn). A basic component consisting of L
A dielectric ceramic composition is disclosed that includes an additive component consisting of i O and 810□.

Moreover, in Japanese Patent Publication No. 61-14608, instead of Li2O and sio in the above-mentioned Japanese Patent Publication No. 61-14607, Li2O, SiO2, and Mo2 are used (where MO is at least one of Bad, CaO, and SrO). ) is disclosed.

In addition, in Japanese Patent Publication No. 61-14609, (Bak-
x-yMxLy)OTlO2 (where M is Mg and Zn
(L is at least one of Sr and Ca) and an additive component consisting of Li 2 O and s i O 2 is disclosed.

In addition, in Japanese Patent Publication No. 61-14610, instead of Li2O and SiO in the above-mentioned Japanese Patent Publication No. 61-14609, Li2O, 8102, and MO (however, MO is Ba
Disclosed is a dielectric ceramic composition containing an additive component selected from the group consisting of at least one of CaO and SrO.

In addition, in Japanese Patent Publication No. 61-14611, (Bak,
M,)ok'rio2 NF+, M is Mg, Zn, S
a basic component consisting of at least one of r and Ca), and B
A dielectric ceramic composition is disclosed that includes three additional components consisting of O and S i O2.

In addition, in Japanese Patent Publication No. 1595/1983, (Bak-x
Mx)o,,Tio2 (However, M is Mg, Zn, S
At least one of r and Ca)), B203 and MO (however, aO1MgO5Z from MOζ
A dielectric ceramic composition containing an additive component consisting of at least one of nO, SrO, and CaO is disclosed.

In addition, in Tokuko No. 1596/1986, instead of 8203 and MO in Tokoku No. 1595/1982, B
O and sto. A dielectric ceramic composition is disclosed which includes an additive component consisting of MO<where MO3 is at least 1'm of Bad, MgO1ZnO, SrO and CaO.

The dielectric ceramic composition disclosed in these documents can be fired in a reducing atmosphere at 1200°C or lower, has a relative dielectric constant of 2000 or more, and has a temperature change rate of capacitance of -25°C. It can be made within a range of ±10% at ~+85°C.

[Question B that the invention attempts to solve] By the way, the recent increase in the density of electronic circuits G; 11. There is a very strong demand for miniaturization of multilayer capacitors, and in order to meet this demand, the dielectric ceramic compositions disclosed in the above-mentioned publications have been developed to improve the relative dielectric constant of the dielectric without worsening the temperature change rate. It is desired that the dielectric constant be further increased than that of .

Therefore, the purpose of the present invention is to use a non-oxidizing atmosphere at 1200°C.
A ceramic capacitor equipped with a dielectric ceramic having a high dielectric constant and a small rate of change in dielectric constant over a wide temperature range, even though it is obtained by firing at the following temperatures, and a method for manufacturing the same. It is about providing.

[Means for Solving the Problems] To achieve the above object, the present invention provides a ceramic capacitor comprising a dielectric ceramic and at least two electrodes in contact with the ceramic, in which the ceramic has a weight of 100.0 parts of the basic component, 0.01 to 3.00 fJ, 1 part of the first additive component, and 0.2 to 5.0 parts by weight of the second additive component, and the basic component is (Ba M)OT
ie□ (However, -XXk M is at least one metal selected from Ca and Sr, and k is 1.
00 to 1.05, X is a numerical value within the range of 0.01 to 0.05), and at least one additive component is Cr 0
3 and A 1203, and the second additive component force (LlO and sto
and MO (however, MO is at least one of l3aO52 SrOlCaOlMgO and ZnO)
120 in the triangular diagram showing these compositions in mol% is 1.
mol%, the S I O2 is 80 mol%, the MO is 1
9 mol% point (A), and the L i 20 is 1 mol%,
The point (B) where the SiO2 is 39 mol % and the first 8-MO is 60 mol %, and the point (B) where the Li 20 is 30 mol % and the Si
A point (C) where O2 is 30 mol% and the MO is 40 mol%, and a point (C) where the L i 20 is 50 mol% and the SiO2 is 50 mol%.
mol%, the point <D) where the MO is 0 mol%, and the Li2
20 mol% of O, 80 mol% of the SiO2, the MO
This relates to a capacitor that is within a region surrounded by five straight lines sequentially connecting points (E) with 0 mol %.

In the compositional formula showing the basic components, k-x and x of course indicate the number of atoms of each element, Ba is barium, O is oxygen, Ti is titanium, Ca is calcium, and Sr is strontium.

The first additive component Cr2O3 is chromium oxide, Al2O3
is aluminum oxide. L in the second additive component
i2O is lithium oxide, SiO2 is silicon oxide, BaO
is barium oxide, SrO is strontium oxide, CaO
is calcium oxide, Mgo is magnesium oxide, ZnO
is zinc oxide.

The invention related to the manufacturing method includes the steps of: preparing a mixture of the above-mentioned basic components and additive components; making a molded product of the mixture having at least two electrode parts; and non-containing the molded product having the electrode parts. The present invention relates to a method for manufacturing a ceramic capacitor, which includes a step of firing in an oxidizing atmosphere and a step of heat-treating a molded product obtained by the firing in an oxidizing atmosphere.

[Operation and Effect] The dielectric ceramic in the ceramic capacitor of the above invention can be obtained by firing in a non-oxidizing atmosphere at 1200° C. or lower.

Therefore, it becomes possible to manufacture a ceramic capacitor by applying a conductive paste of a base metal such as nickel to a green sheet and firing the green sheet and the conductive paste simultaneously. By setting the composition of the dielectric ceramic within the range specified in the present invention, the dielectric constant is 3000 or more, the dielectric loss tan δ is 2.5% or less, and the resistivity ρ is l.
X106MΩ・・C4 or more, and the temperature change rate of relative permittivity is -15% to +15% (2
(based on 5℃), -10% to +10% at -25℃ to 85℃
It is possible to provide a capacitor including dielectric ceramic that falls within the range of 20″C (based on 20″C).

[Examples] Next, Examples and Comparative Examples according to the present invention will be described.

First, in order to obtain the compositional formula (B a M ) OT I O2 of the basic component according to the present invention in the ratio shown in the column x of Sample 1 in Table 1, in other words -"
ao, 97M0.05) 01.02T” 2-More 6
:More details: MO,05"CaO,01SrO,04
Therefore, (BaO,97°aO,01S'0.04
) Purity 99oO% to obtain 01.02T”2
Above B a CO3 (barium carbonate), Ca C0
3 (calcium carbonate), S r CO3 (strontium carbonate), and T10 (prepare titanium chloride, without adding impurities, BaC0: 1032.OOg (equivalent to 0.97 mole part) CaCO3: 5.40g ( (equivalent to 0.01 mole part) S
rCO: 31.83 (equivalent to 0.04 mole part)'T'i0
2:430.77 g (equivalent to 1,00 mole parts) was weighed.

Next, these weighed raw materials are placed in a pot mill (pot mill).
After adding alumina balls and 2.5j of water and stirring for 15 hours, the stirred mixture was placed in a stainless steel pot and dried at 150°C in a hot air dryer for 4 hours. Next, this dried product was coarsely pulverized, and the coarsely pulverized product was calcined in the atmosphere at 1200° C. for 2 hours in a tunnel furnace to obtain the basic components having the above compositional formula.

On the other hand, in order to obtain the second additive component of sample 14Q1 in Table 2, 0.43 g (1 mole part) of Li2O and SiO
68.76g (80 mol parts) of BaCO3 and 1
0.73g (3.8 mol parts) and 8.0g of SrCO3
3g (3.8 mol parts) and 5.44g of CaCO3
<3.8 mol parts), 2.19 g (3.8 mol parts) of MgO, and 4.42 g (3.8 mol parts) of ZnO were weighed, and 300 cc of alcohol was added to this mixture. 1 using an alumina ball in an ethylene pot
After stirring for 0 hours, it was pre-calcined in the air at 1000°C for 2 hours, and then put into an alumina pot with 300cc of water.
Grind with alumina ball for 15 hours, then 150°
After drying at C for 4 hours, L i 20 was 1 mol %, SiO
2 is 80 mol%, MO is 19 mol% (Ba03.8 mol% + SrO3, 8 mol% + CaO3, 8 mol% + MgO
A powder of additive components having a composition of 3.8 mol% and ZnO3.8 mol% was obtained. In addition, the contents of MO, BaO and SrO
The proportions of CaO, MgO, and ZnO are all 20 mol% as shown in Table 2.

Next, 2 parts by weight (20 g) of the second additive component was added to 100 parts by weight (1000 g) of the basic component, and further, as the first additive component, well-aligned particles with an average particle size of 0.5 μm were added. 0.1 part by weight (1 part by weight) of Cr 203 with a purity of 99.0% or more
g) addition, further adding 15% by weight of an organic binder made from an aqueous solution of an acrylic acid ester polymer, glycerin, and condensed phosphate based on the total weight of the basic component and the first and second additive components; Further, 50% by weight of water was added, and the mixture was placed in a ball mill and ground and mixed to prepare a slurry of porcelain raw materials.

Next, the above slurry is degassed by putting it into a vacuum defoaming machine, and this slurry is put into a reverse roll coater, and the thin film molding obtained from this is continuously coated on a long polyester film, and the same This was dried on a film by heating to 100° C. to obtain an unsintered porcelain sheet with a thickness of about 25 μm. This sheet is a beautiful size, but it is 10
Cut it into a square with the CI corner and use it.

On the other hand, the conductive paste for internal electrodes has an average particle size of 1.5 μm.
10g of nickel powder and 0.9g of ethyl cellulose
was dissolved in 9.1 g of butylcarpitol and placed in a stirrer and stirred for 10 hours. This conductive paste was printed on one side of the unsintered porcelain sheet through a screen having 50 patterns of 14 nm in length and 7 in width, and then dried.

Next, two unsintered porcelain sheets were laminated with the printed surfaces facing up. At this time, the adjacent upper and lower sheets were arranged so that their printed surfaces were shifted by about half in the longitudinal direction of the pattern. Furthermore, four unsintered porcelain sheets with a thickness of 60 μm were laminated on each of the upper and lower surfaces of this laminate. Next, this laminate was subjected to a load of approximately 40 tons in the thickness direction at a temperature of approximately 50°C. It was crimped. Thereafter, this laminate was cut into a grid shape to obtain 50 laminate chips.

Next, this laminate was placed in a furnace capable of firing in an atmosphere, and the temperature was raised to 600° C. at a rate of 100° C./h in an air atmosphere to burn the organic binder. Thereafter, the atmosphere in the furnace was changed from air to an atmosphere containing H2 (2% by volume) and 10N (98% by volume). Then, while maintaining the reducing atmosphere in the furnace as described above, the heating temperature of the laminate was increased from 600°C to the sintering temperature of 1150'Ct at a rate of 100°C/h to 1150°C (maximum temperature ) after holding for 3 hours, 100
The temperature is lowered to 600'C at a rate of °C/h, the atmosphere is changed to an air atmosphere (oxidizing atmosphere), 600°C is maintained for 30 minutes to carry out oxidation treatment, and then the laminated sintered body is cooled to room temperature. A chip was created.

Next, in order to obtain the multilayer ceramic capacitor 10 shown in FIG. 1, three dielectric ceramic layers 12 and two internal type f! A pair of external electrodes 16 were formed on a laminated sintered body chip 15 consisting of 14. The external electrode 16 is made of zinc and glass frit on the side surface of the sintered chip 15 where the i4 pole is exposed.
A conductive base consisting of s frit and a vehicle is applied and dried, and this is baked in the atmosphere at a temperature of 550° C. for 15 minutes to form a zinc electrode layer 18, and further electroless plating is applied on this. A copper layer 20 is formed using a copper layer 20, and a pb-sn solder layer 22 is further formed on this using an electroplating method.
It consists of the following.

The thickness of the dielectric ceramic layer 12 of this capacitor 0 is 0.0
2w, the opposing area of the pair of internal electrodes 14 is 5 squares x 5 squares = 2
'zm2. The composition of the porcelain layer 12 after sintering is as follows:
The mixed composition of the basic components and additive components before sintering is substantially the same.

Next, we measured the electrical characteristics of capacitor 0 and found the average value, and as shown in Table 3, we found that the dielectric constant ε was 3.
'810, tan δ is 1.1%, resistivity ρ is 3.7X1
0 MΩ・cm, based on capacitance at 25°C -5
Rate of change in capacitance ΔC, ΔC1□ at 5℃ and +125℃
5 is -10.2%, 55 +3.4%, -25℃ based on the capacitance at 20℃,
The rate of change in capacitance at +85℃ ΔC-25, ΔC85 is -
They were 4.9% and -6.0%.

Note that the electrical characteristics were measured in the following manner.

(A) The relative permittivity ε is at a temperature of 20°C and a frequency of 1kHz.
z, voltage (effective value) 1. The capacitance was measured under OV conditions, and the measured value was 0.02 mm between the opposing area 25 of the pair of internal electrodes 14 and the thickness of the ceramic layer 12 between the pair of internal electrodes 14.
It was calculated from.

(B) Dielectric loss tan δ (%) was measured under the same conditions as the relative dielectric constant.

(C> Resistivity ρ (MΩ cm) was calculated by measuring the resistance value between the pair of external electrodes 16 after applying DClooV for 1 minute at a temperature of 20°C and based on this measurement value and dimensions. .

CD) Temperature characteristics of capacitance were determined by placing the sample in a constant temperature bath and measuring temperatures of -55°C, -25°C, 0°C, +20°C, 25°C,
+40℃, +60℃, +85℃, +105℃, +125
At each temperature of ℃, frequency 1kHz, voltage (effective value >
1. Capacitance was measured under OV conditions, 20°C and 25°C.
It was obtained by determining the rate of change at each temperature with respect to the capacitance at °C.

The preparation method of sample Nα1 and its characteristics have been described above, but for samples 8112 to 103, the compositions of basic components and additive components, their ratios, and the firing temperature in a reducing atmosphere are shown in Tables 1 to 3. A multilayer ceramic capacitor was manufactured in exactly the same manner as Sample 1, except for the changes shown in the table, and its electrical characteristics were measured in the same manner.

Table 1 shows the composition of the basic component and first additive component of each sample and the amount of the second additive component added, Table 2 shows the composition of the second additive component of each sample, Table 3 shows the firing temperature and electrical characteristics of each sample.
In addition, x in the basic component shelf of Table 1 indicates the number of atoms of each element in the composition formula, that is, the ratio of the number of atoms of each element when the number of Ti atoms is 1. , Sr indicate the content of M in the general formula, the number of atoms is shown in the column of these, and the total value (X value) of these is shown in the column of total. The amount of the first and second additive components is 1 of the basic component.
It is expressed in parts by weight relative to 00 parts by weight. In the MO content column of the second additive component in Table 2, Bad, MgO5
The proportions of ZnO and 5rO5CaO are shown in mol%. In Table 3, the temperature characteristics of capacitance are based on the capacitance at 25°C, and the capacitance change rate ΔC (%) and ΔC (%) at 55°C and +125"C, and -55125 20 The capacitance change rates ΔC (%) and Δc8525 (%) are shown at −25° C. and +85° C. based on the capacitance at °C.

As is clear from Tables 1 to 3, the samples according to the present invention have a relative dielectric constant ε of 3000 or more and a dielectric loss tan δ of 2.5 in a non-oxidizing atmosphere and under baking conditions of 1200°C or less.
% or less, resistivity ρ is 1 x 106 MΩ・01 or more, temperature change rate of capacitance ΔC-55 and ΔC125 is 15% or more
+15%, ΔC-25 and ΔC85 are -10% to +10
%, and a capacitor with desired characteristics can be obtained. On the other hand, between samples, 11-16.27.32.33.
38.39.44.45.52.53.54.62.6
3.70-74.79.80.84.85.94.95
96.102.103 cannot achieve the purpose of the present invention, and therefore they are outside the scope of the present invention.

Table 3 shows only ΔC, ΔC125, ΔC-25, Δ55C8, but it is one of the samples that belong to the scope of the present invention.Various capacitance change rates in the range of 25°C to +85°C ΔC falls within the range of −10% to +10%, and the rate of change of various capacitances ΔC within the range of −55° C. to +125° C. falls within the range of −15% to +15%.

Next, the reasons for limiting the composition will be described.

If the value of
Although C-55 is outside the range of -15% to +15%, as shown in sample Nα46.47.55.56.64.65,
When the value of X is 0.01, desired electrical characteristics can be obtained. Therefore, the lower limit of the value of X is 0.01. On the other hand, sample NQ52.53.62.70.71.72
．． As shown in 73, when the value of X is 0.06, ΔC
85 is outside the range of -10% to +10%, but sample Nα
50.51.58.59.60, 61.67.68.6
As shown in FIG. 9, when the value of X is 0.05, desired electrical characteristics can be obtained. Therefore, the upper limit of the value of X is 0.05. Note that the M components Ca and Sr work almost in the same way, and the same result can be obtained even if one selected from them is used or a plurality of them are used. And M
It is desirable that the value of X be in the range of 0.01 to 0.05 in either case of one or more of the components.

When the value of k is smaller than 1°0, as shown in 74.80 between samples, ρ is less than lX10'MΩ・1,
Although significantly lower, desired electrical characteristics can be obtained when the value of k is 1.00, as shown in sample spacing 75.81. Therefore, the lower limit of the value of k is 1.00. On the other hand, when the value of k is larger than 1.05 as shown in sample N079.84, a dense sintered body cannot be obtained, but sample NQ7
As shown in 8.83, desired electrical characteristics can be obtained when the value of k is 1.05. Therefore, the upper limit of the value of k is 1.
It is 05.

Cr2O3 and/or Al2O3 as the first additive component
If the amount added is zero as shown in sample No. 85.96, ΔC-55 will be less than -15%, but sample No. 86
．． As shown in 87.97.98, when the amount added is 0.01 part by weight per 100 parts by weight of the basic component, desired characteristics can be obtained. Therefore, the lower limit of the first additive component is 0
．． It is 01. - side, between samples 94.95.102.10
As shown in Figure 3, the amount added is 3. Of! If the amount is greater than 1 part by weight, a dense sintered body cannot be obtained even if fired at 1250°C, but iIn <
When the amount added is 3.0 parts by weight, desired characteristics can be obtained. Therefore, the upper limit of the first additive component is 1 part by weight. Note that the first additive component Cr 20 and A I
203 works almost the same way, and 1 selected from these
Similar results can be obtained using one or more. Whether the first additive component is one type or multiple types, the amount added is preferably in the range of 0.01 to 3.0. Note that this first additive component is
If? Contributes to the improvement of capacitance characteristics. That is, by adding the first additive component, the temperature change rate of capacitance ΔC to ΔC1°5 in the range of -55°C to 125°C can be easily kept within the range of -55% to +15%. At the same time, it becomes possible to easily keep the temperature change rate of capacitance ΔC-2, ~ΔC85 in the range of -25°C to 85°C within the range of -10% to +10%, and It is possible to reduce the fluctuation range of the temperature change rate of capacitance. Further, the first additive component has the effect of slightly increasing the resistivity ρ.

When the amount of the second additive component added is zero, sample No.
As is clear from 27.33.39, the firing temperature is 125
Even at 0°C, a dense sintered body cannot be obtained, but the sample! +
As shown in 0.28.34.40, when the amount added is 0.2 parts by weight per 100 parts by weight of the basic component, 118
A sintered body having desired electrical properties can be obtained by firing at 0 to 1190°C. Therefore, the lower limit of the second additive component is 0.2
Parts by weight.

On the other hand, as shown in sample 32.38.44, when the amount of the second additive component is 6.0 parts by weight, ε is 300
becomes less than 0, and ΔC-25 or ΔC85 becomes 11
It is outside the range of 0% to +10%, or ΔC or Δ
Although C125 is outside the range of -15% to +155%, desired characteristics can be obtained when the amount added is 5.0 parts by weight, as shown in sample No. 031.37.43. Therefore, the upper limit of the amount added is 5.0 parts by weight.

A preferred composition of the second additive component is Li20-
It can be determined based on a triangular diagram showing the composition ratio of 3 i 02-Mo. The first point (A) of the triangular diagram shows the composition of sample No. 1 with 1 mol% of Li2O, 80 mol% of SiO2, and 19 mol% of MO, and the second point (B) shows the composition of sample No. 1. 1 mol% of Li2O, 3% of SiO2
9 mol%, MO shows a composition of 60 mol%, and the third point (
C) is sample NQ3 with 30 mol% Li2O and SiO2
indicates a composition of 30 mol%, MO is 40 mol%, and the fourth point (D> is 50 mol% of L i 20 of sample NG4,
sio.

is 50 mol%, MO is 0 mol%, and the fifth point (E) is the composition in which L i 20 of test INQ5 is 20 mol%, S
It shows a composition of 80 mol% I O2 and 0 mol% MO.

The composition of the additive components of the sample that falls within the scope of the present invention is within the region surrounded by five straight lines connecting the first to fifth points (A) to (B) of the triangular diagram in order.

If the composition is within this range, desired electrical characteristics can be obtained. On the other hand, if the composition of the second additive component falls outside the range specified in the present invention, as in samples Nos. 11 to 16, a dense sintered body cannot be obtained. As shown in 22 to 26 <Bad, MgO
, ZnO1SrO, and CaO, or an appropriate ratio as shown in other samples.

[Modifications] Although the embodiments of the present invention have been described above, the present invention is not limited thereto, and, for example, the following modifications are possible.

(a) A trace amount of M n O2 (preferably 0.05-0.
A mineralizing agent such as 1% by weight) may be added to improve sinterability. Further, other substances may be added as necessary.

(b) The starting material may be an oxide or hydroxide or a compound thereof other than those shown in the examples.

(c) Even if the temperature of the treatment in the oxidizing atmosphere after the treatment in the non-oxidizing atmosphere during firing is lower than the sintering temperature other than 600 °C (preferably in the range of 500 °C to 1000 °C). In other words, various changes can be made in consideration of the electrode material such as nickel and the oxidation of the porcelain.

(d) The firing temperature in a non-oxidizing atmosphere can be varied depending on the electrode material. When nickel is used as the internal electrode, hardly any agglomeration of nickel particles occurs in the range of 1050°C to 1200°C.

(e) Sintering may be performed in a neutral atmosphere.

(f> It is of course applicable to general single-layer ceramic capacitors other than multilayer ceramic capacitors.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a multilayer ceramic capacitor according to an embodiment of the present invention, and FIG. 2 is a triangular diagram showing the composition range of additive components. 12... Ceramic layer, 14... Internal electrode, 16... External electrode.

Claims (1)

[Scope of Claims] [1] A ceramic capacitor comprising a dielectric ceramic and at least two electrodes in contact with the ceramic, wherein the ceramic contains 100.0 parts by weight of a basic component and 0.01 to 0.01 parts by weight of a basic component.
It consists of 3.00 parts by weight of the first additive component and 0.2 to 5.0 parts by weight of the second additive component, and the basic component is (Ba_k_−_xM_x)O_kTiO_2 (However,
M is at least one metal selected from Ca and Sr, k is a numerical value within the range of 1.00 to 1.05, and x is a numerical value within the range of 0.01 to 0.05), and the first additive component is Cr_2O_3 and Al_2O_3
The second additive component is at least one metal oxide of Li_2O, SiO_2, and MO (however, MO
is made of at least one metal oxide of BaO, SrO, CaO, MgO, and ZnO, and the Li_
The composition range of 2O, the SiO_2, and the MO is a point (A) where the Li_2O is 1 mol%, the SiO_2 is 80 mol%, and the MO is 19 mol% in a triangular diagram showing these compositions in mol%. , said Li_2
O is 1 mol%, the SiO_2 is 39 mol%, the MO
Point (B) where Li_2O is 60 mol%, point (C) where Li_2O is 30 mol%, SiO_2 is 30 mol%, and MO is 40 mol%, and Li_2O is 50 mol% and the S
Point (D) where iO_2 is 50 mol% and the MO is 0 mol%
, the Li_2O is 20 mol%, and the SiO_2 is 8 mol%.
0 mol %, and the capacitor is within an area surrounded by five straight lines sequentially connecting the point (E) where the MO is 0 mol %. [2] 100.0 parts by weight of basic components, and 0.01 to 3.
It consists of 00 parts by weight of the first additive component and 0.2 to 5.0 parts by weight of the second additive component, and the basic component is (Ba_k_−_xM_x)O_kTiO_2 (however,
M is at least one metal selected from Ca and Sr, and k is 1.
00 to 1.05, x is a numerical value within the range of 0.01 to 0.05), and the first additive component is Cr_2O_3 and A
Li_2O_3 is at least one metal oxide of Li_2O_3, and the second additive component is Li_2O, SiO_2 and MO.
(However, MO is BaO, SrO, CaO, MgO and Z
nO), and the composition range of the Li_2O, the SiO_2, and the MO is such that the Li_2O is 1 mol% and the SiO_2 in the triangular diagram showing these compositions in mol%. is 80 mol%,
Point (A) where the MO is 19 mol%, the Li_2O is 1 mol%, the SiO_2 is 39 mol%, and the MO is 6 mol%.
0 mol% point (B) and the Li_2O is 30 mol%,
The point (C) where the SiO_2 is 30 mol% and the MO is 40 mol%, and the point (C) where the Li_2O is 50 mol% and the SiO
A point (D) where _2 is 50 mol% and the MO is 0 mol%,
A mixture characterized in that the mixture is within a region surrounded by five straight lines connecting in order the point (E) where the Li_2O is 20 mol%, the SiO_2 is 80 mol%, and the MO is 0 mol%. a step of preparing a molded product of the mixture having at least two electrode portions; a step of firing the molded product having the electrode portion in a non-oxidizing atmosphere; and a step of baking the molded product obtained by the firing. A method for manufacturing a ceramic capacitor, comprising a step of heat treatment in an oxidizing atmosphere.