KR20130038695A - Perovskite powder, fabricating method thereof and multi-layer ceramic electronic parts fabricated by using the same - Google Patents

Abstract

PURPOSE: A manufacturing method of perovskite powder is provided to obtain perovskite powder of highly crystalline granules by forming at least one film layer selected from a group consisting of salt which includes sulfide and sulfur when composing perovskite powder using hydrothermal synthesis method. CONSTITUTION: A perovskite powder formed a covering layer in surface. The covering layer is at least one which is selected from group consisting of salt which includes the sulfide and sulfur. The sulfide is ammonium sulfate. Salt including the sulfur is at least one selected from a group consisted of phosphate and acetate. A manufacturing method of the perovskite powder comprises following steps. (a) Form perovskite particle nuclear by mixing metal salt and metal oxide. (b) Mix more than one selected from a group consisting of the perovskite particle nuclear, sulfide dissolved in purified water and salt comprises sulfur. And (c) obtain perovskite powder by grain growing in a hydrothermal treatment. [Reference numerals] (AA) Step of forming perovskite particle nuclear by mixing metal salt and metal oxide; (BB) Step of mixing the perovskite particle nuclear and one or more selected from a group consisting of salts containing sulfide and sulfur dissolved in purified water; (CC) Step of grain growing the mixture with hydrothermal treatment and obtaining perovskite powder with the surface on which one or more film layers selected from a group consisting of the salts containing sulfide and sulfur are formed;

Description

Perovskite powder, manufacturing method thereof and laminated ceramic electronic part using the same {Perovskite powder, fabricating method according to the invention and multi-layer ceramic electronic parts fabricated by using the same}

The present invention relates to a perovskite powder from which a highly crystalline fine perovskite powder can be obtained, a manufacturing method thereof, and a multilayer ceramic electronic component using the same.

Perovskite powder is used as a raw material for electronic components such as multilayer capacitor (MLCC), ceramic filter, piezoelectric element, ferroelectric memory, thermistor, varistor, etc. as a ferroelectric ceramic material.

Barium titanate (BaTiO 3) is a high dielectric constant material having a perovskite structure and is used as a dielectric material of a multilayer ceramic capacitor.

Today, in the electronic parts industry, ferroelectric particles are required to have a small size and good dielectric constant and reliability in accordance with trends such as thinning, high capacity and high reliability.

If the particle diameter of the barium titanate powder, which is a main component of the dielectric layer, is large, the surface roughness of the dielectric layer may increase, resulting in a problem of an increase in shot rate and poor insulation resistance.

For this reason, atomization of the barium titanate powder which is a main component is calculated | required.

However, when the barium titanate powder is atomized, there is a problem in that the tetragonal coefficient decreases. Accordingly, it is required to overcome such a crystalline problem and to develop a highly crystalline barium titanate powder.

Methods for producing such perovskite powder include a solid phase method and a wet method, and the wet method includes an oxalate precipitation method and a hydrothermal synthesis method.

The solid phase method is usually difficult to produce perovskite powder as fine particles due to the fact that the minimum powder size of particles is about 1 micron, which is difficult to control the size of the particles, and that the aggregation of particles and contamination generated during firing are problematic. There is this.

Decreasing tetragonality as the dielectric particle size decreases is a common phenomenon in various processes, and when it is smaller than 100 nm, it is very difficult to secure a crystal axis ratio (c / a).

In addition, as the powder size becomes smaller, dispersion becomes more difficult. Therefore, the finer the powder, the higher the dispersibility is required.

Since the existing solid phase method or coprecipitation method forms a crystal phase by high temperature calcination, a high temperature calcination process and a grinding process are required.

For this reason, the synthesized perovskite powder is not good in shape, has a disadvantage in that the particle size distribution is wide, and there is a problem in that dispersion occurs due to agglomeration due to heat treatment.

The present invention relates to a perovskite powder from which a highly crystalline fine perovskite powder can be obtained, a manufacturing method thereof, and a multilayer ceramic electronic component using the same.

One embodiment of the present invention provides a perovskite powder having at least one coating layer selected from the group consisting of sulfides and salts comprising sulfur on its surface.

The sulfide may be ammonium sulfate, and the salt containing sulfur may be at least one selected from the group consisting of phosphate and acetate.

The thickness of the coating layer may be 0.1 to 10 nm.

The perovskite powder is BaTiO ₃ , BaTi _x Zr _1-x O ₃ , Ba _x Y _1-x TiO ₃ , Ba _x Dy _1-x TiO ₃ and Ba _x Ho _1-x TiO ₃ (0 <x <1 It may be one or more selected from the group consisting of

The average particle diameter of the perovskite powder may be 10 to 150 nm, the crystal axis ratio (c / a) of the perovskite powder may be 1.001 to 1.010.

Another embodiment of the present invention comprises the steps of mixing a metal salt and a metal oxide to form a perovskite particle nucleus; Mixing at least one selected from the group consisting of sulfides and sulfur-containing salts dissolved in the pure perovskite particle nucleus with pure water; And growing the mixture by hydrothermal treatment to obtain perovskite powder having at least one coating layer selected from the group consisting of sulfides and salts containing sulfur on a surface thereof. .

The sulfide may be ammonium sulfate, and the salt containing sulfur may be at least one selected from the group consisting of phosphate and acetate.

The metal salt may be barium hydroxide or a mixture of barium hydroxide and rare earth salt, and the metal oxide may be titanium oxide or zirconium oxide.

The thickness of the coating layer may be 0.1 to 10 nm.

The average particle diameter of the perovskite powder may be 10 to 150 nm, the perovskite powder is BaTiO ₃ , BaTi _x Zr _{1 - x} O ₃ , Ba _x Y _{1 - x} TiO ₃ , Ba _x Dy _{1 - x} TiO ₃ And Ba _x Ho _{1 - x} TiO ₃ It may be one or more selected from the group consisting of (0 <x <1), the crystal axis ratio (c / a) of the perovskite powder may be 1.001 to 1.010.

Another embodiment of the invention is a ceramic body comprising a dielectric layer comprising a perovskite powder is formed on the surface of at least one coating layer selected from the group consisting of sulfides and salts containing sulfur; And an internal electrode layer disposed to face each other with the dielectric layer interposed therebetween in the ceramic body.

The thickness of the coating layer may be 0.1 to 10 nm.

The perovskite powder may be BaTiO ₃ , BaTi _x Zr _{1 - x} O ₃ , Ba _x Y _{1 - x} TiO ₃ , Ba _x Dy _{1 - x} TiO ₃ And Ba _x Ho _1-x TiO ₃ (0 <x <1), and the crystal axis ratio (c / a) of the perovskite powder may be 1.001 to 1.010.

According to the present invention, when the perovskite powder is synthesized by hydrothermal synthesis, the preparation of the highly crystalline fine particles of the perovskite powder having suppressed particle growth by forming at least one coating layer selected from the group consisting of sulfides and sulfur-containing salts It is possible.

In addition, the multilayer ceramic electronic component manufactured by using the perovskite powder may improve the reliability due to less cracks.

1 is a perspective view schematically showing a multilayer ceramic capacitor according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line AA ′ of FIG. 1.
3 is a flowchart illustrating a process for preparing perovskite powder according to an embodiment of the present invention.
4 is a scanning electron microscope (SEM) photograph of the barium titanate powder and the conventional barium titanate powder according to one embodiment of the present invention.
5 is a photograph of scanning transmission electron microscope (STEM) for each temperature of barium titanate powder according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention may be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Furthermore, embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. Accordingly, the shapes and sizes of the elements in the drawings may be exaggerated for clarity of description, and the elements denoted by the same reference numerals in the drawings are the same elements.

In the perovskite powder according to one embodiment of the present invention, at least one coating layer selected from the group consisting of a sulfide and a salt containing sulfur may be formed on the surface.

The perovskite powder is not particularly limited, for example, BaTiO ₃ , BaTi _x Zr _1-x O ₃ , Ba _x Y _{1 - x} TiO ₃ , Ba _x Dy _{1 - x} TiO ₃ And Ba _x Ho _{1 - x} TiO ₃ At least one selected from the group consisting of (0 <x <1).

Hereinafter, the perovskite powder, in particular the barium titanate (BaTiO ₃ ) powder according to one embodiment of the present invention will be described, but is not limited thereto.

According to one embodiment of the present invention, the barium titanate (BaTiO ₃ ) powder prepared by the hydrothermal synthesis method is formed on the surface of at least one coating layer selected from the group consisting of a sulfide and a salt containing sulfur, having a high crystallinity and fine It may be a powder of.

The sulfide and the salt containing sulfur are not particularly limited and may be, for example, ammonium sulfate, and may be at least one selected from the group consisting of phosphates and acetates.

According to the existing hydrothermal synthesis method, to reduce the particle size of the barium titanate (BaTiO ₃ ) powder, the reaction temperature must be reduced. However, in this case, the crystallinity of the powder is deteriorated. In this case, there is a problem that the particle size becomes large.

However, according to one embodiment of the invention, at least one coating layer selected from the group consisting of the sulfide and the salt containing sulfur is formed on the surface of the barium titanate (BaTiO ₃ ) powder, so that even if the reaction proceeds at a high temperature Grain growth can be suppressed and fine powder can be obtained while securing high crystallinity.

The thickness of the coating layer is not particularly limited, but may be, for example, 0.1 to 10 nm.

As described above, since the thickness of the coating layer is formed on the surface of the barium titanate (BaTiO ₃ ) powder at 0.1 to 10 nm, the grain growth of the powder may be suppressed even when the barium titanate powder is grown at a high temperature, thereby achieving atomization.

In the case where the thickness of the coating layer is less than 0.1 nm, when grain growth is performed at a high temperature, the grain growth inhibitory effect of the barium titanate (BaTiO ₃ ) powder may be insufficient, making it difficult to manufacture fine powder.

In addition, when the thickness of the coating layer exceeds 10 nm, there is a problem that the thickness of the coating layer is thick, causing a decrease in dielectric constant of the barium titanate (BaTiO ₃ ) powder.

According to one embodiment of the present invention, it is possible to produce fine barium titanate (BaTiO ₃ ) powder while ensuring high crystallinity as described above, in particular, the average particle diameter of the barium titanate (BaTiO ₃ ) powder is 10 to 150 nm The crystal axis ratio (c / a) of the barium titanate (BaTiO ₃ ) powder may be 1.001 to 1.010.

1 is a perspective view schematically showing a multilayer ceramic capacitor according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line AA ′ of FIG. 1.

1 and 2, a multilayer ceramic electronic component according to an exemplary embodiment of the present disclosure may include a dielectric layer including perovskite powder having one or more coating layers selected from a group consisting of sulfides and sulfur-containing salts formed on a surface thereof. A ceramic body 10 comprising 1); And internal electrode layers 21 and 22 disposed to face each other in the ceramic body 10 with the dielectric layer 1 therebetween.

Hereinafter, a multilayer ceramic electronic component according to an exemplary embodiment of the present invention will be described. In particular, the multilayer ceramic capacitor is described as, but is not limited to.

In the multilayer ceramic capacitor according to one embodiment of the present invention, the 'longitudinal direction' is defined as 'L' direction, 'width direction' as 'W' direction, and 'thickness direction' as T direction do. Here, the 'thickness direction' can be used in the same concept as the stacking direction of the dielectric layers, that is, the 'lamination direction'.

According to one embodiment of the present invention, the raw material for forming the dielectric layer 1 is not particularly limited as long as sufficient capacitance can be obtained, and may be, for example, barium titanate (BaTiO ₃ ) powder.

The barium titanate (BaTiO ₃ ) powder may be formed with one or more coating layer selected from the group consisting of a sulfide and a salt containing sulfur on the surface.

The thickness of the coating layer may be 0.1 to 10 nm.

An average particle diameter of the barium titanate (BaTiO ₃ ) powder may be 10 to 150 nm, and the crystal axis ratio (c / a) may be 1.001 to 1.010.

According to one embodiment of the present invention, since the dielectric layer 1 is formed by using barium titanate (BaTiO ₃ ) powder having at least one coating layer selected from the group consisting of sulfides and sulfur-containing salts on the surface, high crystallinity is ensured. It can be composed of fine particles.

Therefore, the multilayer ceramic capacitor manufactured using the barium titanate (BaTiO ₃ ) powder may have an effect of improving reliability due to less cracks.

A variety of ceramic additives, organic solvents, plasticizers, binders, dispersants and the like may be added to the powder of the barium titanate (BaTiO ₃ ) according to the purpose of the present invention.

In addition, the features of the barium titanate (BaTiO ₃ ) powder is overlapped with the features of the perovskite powder according to an embodiment of the present invention described above, it will be omitted here.

The material forming the first and second internal electrodes 21 and 22 is not particularly limited, and for example, silver (Ag), lead (Pb), platinum (Pt), nickel (Ni), and copper (Cu). Can be formed using a conductive paste made of one or more materials.

A multilayer ceramic capacitor according to an embodiment of the present invention includes a first external electrode 31 electrically connected to the first internal electrode 21 and a second external electrode 32 electrically connected to the second internal electrode 22 ). &Lt; / RTI &gt;

The first and second external electrodes 31 and 32 may be electrically connected to the first and second internal electrodes 21 and 22 to form a capacitance, and the second external electrode 32 may be formed of the first and second external electrodes 32 and 32. 1 may be connected to a potential different from that of the external electrode 31.

The first and second external electrodes 31 and 32 are not particularly limited as long as they can be electrically connected to the first and second internal electrodes 21 and 22 for the formation of electrostatic capacitance. And at least one selected from the group consisting of copper (Cu), nickel (Ni), silver (Ag), and silver-palladium (Ag-Pd).

3 is a flowchart illustrating a process for preparing perovskite powder according to an embodiment of the present invention.

Referring to Figure 3, the method for producing a perovskite powder according to an embodiment of the present invention comprises the steps of mixing a metal salt and a metal oxide to form a perovskite particle nucleus; Mixing at least one selected from the group consisting of sulfides and sulfur-containing salts dissolved in the pure perovskite particle nucleus with pure water; And growing the mixture by hydrothermal treatment to obtain perovskite powder having at least one coating layer selected from the group consisting of sulfides and salts containing sulfur on a surface thereof.

Hereinafter, the manufacturing process of the perovskite powder according to the present embodiment will be described in detail for each step.

The perovskite powder is a powder having a structure of ABO _{3. In} one embodiment of the present invention, the metal oxide is an elemental source corresponding to the B site, and the metal salt is an element of the element corresponding to the A site Source.

First, metal salts and metal oxides can be mixed to form perovskite particle nuclei.

The metal oxide may be at least one selected from the group consisting of titanium (Ti) and zirconium (Zr).

In the case of titania and zirconia, hydrolysis is very easy, and when mixed with pure water without any additive, functional titanium and hydrous zirconium can be precipitated in gel form.

The functional metal oxide may be washed to remove impurities.

More specifically, the hydrous metal oxide may be filtered under pressure to remove residual solution and filtered while pouring pure water to remove impurities present on the particle surface.

Next, pure water, an acid or a base may be added to the hydrous metal oxide.

Pure water is added to the hydrous metal oxide powder obtained after the filter, and stirred with a high-viscosity stirrer. The hydrous metal oxide slurry can be prepared by holding the mixture at 0 to 60 ° C for 0.1 to 72 hours.

An acid or a base may be added to the prepared slurry. The acid or base may be used as a peptizing agent and may be added in an amount of 0.0001 to 0.2 mole relative to the content of the hydrous metal oxide.

The acid is not particularly limited as long as it is general, and examples thereof include hydrochloric acid, nitric acid, sulfuric acid, phosphoric acid, formic acid, acetic acid, polycarboxylic acid and the like.

The base is not particularly limited as long as it is a general one, and examples thereof include tetramethylammonium hydroxide and tetraethylammonium hydroxide. These bases may be used alone or in combination.

The metal salt may be a mixture of barium hydroxide or barium hydroxide and rare earth salts.

The rare earth salt is not particularly limited, and for example, yttrium (Y), dysprosium (Dy) and holmium (Ho) can be used.

The step of forming the perovskite particle nuclei may be performed at 60 ° C to 150 ° C.

Next, the perovskite particle nucleus may be introduced into a hydrothermal reactor, and one or more selected from the group consisting of sulfide and sulfur containing salts dissolved in pure water may be mixed.

Obtaining the perovskite powder may be carried out while heating the perovskite particle nucleus from 150 ℃ to 400 ℃.

Next, the mixture may be grain-grown by hydrothermal treatment to obtain perovskite powder having at least one coating layer selected from the group consisting of sulfides and sulfur-containing salts on the surface.

According to the present invention, since at least one coating layer selected from the group consisting of sulfides and sulfur-containing salts is formed on the surface of the perovskite powder, it is excellent in crystallinity even when grain growth at a high temperature, it is possible to produce fine powder.

Specifically, the perovskite particle nucleus is grown in a hydrothermal reactor under conditions of raising the temperature from 150 ° C. to 400 ° C. and maintaining 0.1 hour to 240 hours.

Through the above process, high crystalline perovskite powder particles are obtained.

The perovskite powder may be BaTiO ₃ , BaTi _x Zr _{1 - x} O ₃ , Ba _x Y _{1 - x} TiO ₃ , Ba _x Dy _{1 - x} TiO ₃ And Ba _x Ho _1-x TiO ₃ (0 < x < 1).

The high crystalline perovskite powder prepared by the method of preparing the perovskite powder may have an average particle diameter of 10 to 150 nm and a crystal axis ratio (c / a) of 1.001 to 1.010.

The crystal axis ratio (c / a) value is represented by a with the same length of a and b for tetragonal particles in the crystal axes a, b and c of the crystal grains, and in this case means the ratio of the lattice lengths of a and c.

Hereinafter, the present invention will be described in more detail with reference to preferred embodiments, but the present invention is not limited thereto.

Titanium tetraisopropoxide is hydrolyzed to form hydrous titanium and then filtered.

Next, pure water is added to the water-containing titanium, nitric acid is added to H + / Ti = 0.05, and the mixture is stirred at a temperature of about 60 degrees while stirring using a high viscosity stirrer to prepare a titanium oxide (TiO ₂ ) sol.

The sol produced through peptization is translucent, slightly blue in color, and forms a very stable sol in a monodisperse state. As a result of measuring the permeability of the formed sol with turbiscan, the transmittance was 75%. In the case of pure water, the transmittance is 90%. The TiO ₂ particle size is formed in a single crystal of about 3 nm, and is an anatase.

Barium hydroxide octahydrate (Ba (OH) ₂ 8H ₂ O) was placed in a reactor such that Ba / Ti ≧ 1, and then purged with nitrogen gas to suppress the change of barium carbonate (BaCO ₃ ).

Next, after the pure water is added, the temperature is raised to 95 ° C. to completely dissolve the barium hydroxide octahydrate (Ba (OH) ₂ 8H ₂ O), and the heated TiO ₂ sol is added with nitrogen gas, followed by high speed stirring.

After reacting at 95 ° C, barium titanate (BaTiO ₃ ) particle nuclei are generated.

The barium titanate (BaTiO ₃ ) particle nucleus is transferred to a 30 L hydrothermal reactor, and ammonium sulfate (Ammonium Sulfate) is dissolved in pure water and introduced into a hydrothermal reactor.

The 30L hydrothermal reactor was heated to 260 ° C. and reacted with stirring for 3 to 10 hours.

Barium titanate (BaTiO ₃ ) slurry obtained after the reaction was washed with pure water and dried in an oven set to 150 ℃ to prepare a barium titanate (BaTiO ₃ ) powder.

Table 1 below is a table comparing the physical properties of the final barium titanate (BaTiO ₃ ) powder obtained according to the grain growth temperature and the addition of ammonium sulfate when the barium titanate (BaTiO ₃ ) powder is prepared by the hydrothermal synthesis method .

Reaction condition Concentration 0.5M, 200 degrees Celsius, 2 hours (H) Concentration 0.5M, 260 degrees Celsius, 3 hours (H) Ammonium Sulfate added
Concentration 0.5M, 200 degrees Celsius, 2 hours (H) D50 (nm) 51.72 51.54 51.20 D99 / D50 1.76 1.58 1.80 Specific surface area
(m ² / g)
17.44 15.72 18.49 Crystal Shaft Ratio (c / a) 1.00593 1.00634

FIG. 4 is a scanning electron microscope (SEM) photograph of barium titanate powder (FIGS. 4A and 4B) and a conventional barium titanate powder (FIG. 4C) according to an embodiment of the present invention.

Referring to [Table 1] and FIG. 4, as a result of lowering the grain growth temperature from 260 ° C. to 200 ° C. to reduce particle size, the specific surface area was increased (FIG. 4 (a)), while maintaining the grain growth temperature at 260 ° C. FIG. It can be seen that the specific surface area of the barium titanate (BaTiO ₃ ) powder to which ammonium sulfate was added was similarly increased.

Furthermore, after performing XRD measurement on the barium titanate (BaTiO ₃ ) powder according to the embodiment of the present invention, the crystal axis ratio (c / a) value calculated using the Rietveld method is 1.00634, and ammonium sulfate (Ammonium) Barium titanate (BaTiO ₃ ) powder without the addition of sulfate is higher than 1.00593 it can be seen that the dielectric constant can be increased.

Therefore, according to one embodiment of the present invention, the dielectric constant of barium titanate (BaTiO ₃ ) powder to which ammonium sulfate (Ammonium Sulfate) is added may be increased.

5 is a photograph of scanning transmission electron microscope (STEM) for each temperature of barium titanate powder according to an embodiment of the present invention.

Referring to FIG. 5, in the case of barium titanate (BaTiO ₃ ) powder having a low grain growth temperature, pores are present in the particles.

Due to the pores present in the particles, the crystallinity of the barium titanate (BaTiO ₃ ) powder may be lowered, and when the reaction is performed at low temperature, the pores may be generated.

Meanwhile, sulfate ions generated by dissolving ammonium sulfate during the growth of barium titanate (BaTiO ₃ ) during the hydrothermal synthesis process may exist by adsorption or electrostatic attraction on the surface of the barium titanate (BaTiO ₃ ) powder during the reaction. .

In addition, sulfur may be coated or substituted on the surface of the barium titanate (BaTiO ₃ ) powder after the final reaction.

The presence of sulfur can act as a catalyst for the debinder during firing, so that the occurrence frequency of cracks in the multilayer ceramic capacitor is reduced, thereby enabling the implementation of a multilayer ceramic capacitor having excellent reliability.

It is intended that the invention not be limited by the foregoing embodiments and the accompanying drawings, but rather by the claims appended hereto. It will be apparent to those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. something to do.

1: dielectric layer 10: ceramic body
21: first internal electrode 22: second internal electrode
31, 32: first and second external electrodes

Claims (20)

A perovskite powder having at least one coating layer selected from the group consisting of sulfides and salts containing sulfur on its surface. The method of claim 1,
The sulfide is ammonium sulfate (Ammonium Sulfate) perovskite powder. The method of claim 1,
The salt containing sulfur is at least one perovskite powder selected from the group consisting of phosphate and acetate. The method of claim 1,
The thickness of the coating layer is 0.1 to 10 nm perovskite powder. The method of claim 1,
The perovskite powder may be BaTiO ₃ , BaTi _x Zr _{1 - x} O ₃ , Ba _x Y _{1 - x} TiO ₃ , Ba _x Dy _{1 - x} TiO ₃ And Ba _x Ho _1-x TiO ₃ (0 <x <1). The method of claim 1,
An average particle diameter of the perovskite powder is 10 to 150 nm perovskite powder. The method of claim 1,
Perovskite powder having a crystal axis ratio (c / a) of the perovskite powder of 1.001 to 1.010. Mixing the metal salt and the metal oxide to form a perovskite particle nucleus;
Mixing at least one selected from the group consisting of sulfides and sulfur-containing salts dissolved in the pure perovskite particle nucleus with pure water; And
Granulating the mixture by hydrothermal treatment to obtain perovskite powder having at least one coating layer selected from the group consisting of sulfides and salts containing sulfur on the surface;
Method for producing a perovskite powder comprising a. 9. The method of claim 8,
The sulfide is ammonium sulfate (Ammonium Sulfate) method for producing a perovskite powder. 9. The method of claim 8,
The salt containing sulfur is a method for producing perovskite powder is at least one selected from the group consisting of phosphate and acetate. 9. The method of claim 8,
The metal salt is a method of producing a perovskite powder is a barium hydroxide or a mixture of barium hydroxide and rare earth salts. 9. The method of claim 8,
The metal oxide is titanium oxide or zirconium oxide manufacturing method of perovskite powder. 9. The method of claim 8,
The thickness of the coating layer is 0.1 to 10 nm method of producing a perovskite powder. 9. The method of claim 8,
Method for producing a perovskite powder is the average particle diameter of the perovskite powder is 10 to 150 nm. 9. The method of claim 8,
The perovskite powder may be BaTiO ₃ , BaTi _x Zr _{1 - x} O ₃ , Ba _x Y _{1 - x} TiO ₃ , Ba _x Dy _{1 - x} TiO ₃ And Ba _x Ho _1-x TiO ₃ (0 <x <1). 9. The method of claim 8,
Method for producing a perovskite powder is the crystal axis ratio (c / a) of the perovskite powder is 1.001 to 1.010. A ceramic body comprising a dielectric layer comprising a perovskite powder having at least one coating layer selected from the group consisting of sulfides and sulfur containing salts on a surface thereof; And
And an internal electrode layer disposed to face each other with the dielectric layer interposed therebetween in the ceramic body. 18. The method of claim 17,
The thickness of the coating layer is 0.1 to 10 nm multilayer ceramic electronic component. 18. The method of claim 17,
The perovskite powder may be BaTiO ₃ , BaTi _x Zr _{1 - x} O ₃ , Ba _x Y _{1 - x} TiO ₃ , Ba _x Dy _{1 - x} TiO ₃ And Ba _x Ho _1-x TiO ₃ (0 <x <1). 18. The method of claim 17,
The multilayer ceramic electronic component having a crystal axis ratio (c / a) of the perovskite powder is 1.001 to 1.010.

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