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Method of manufacturing perovskite powder, perovskite powder manufactured by the same and multilayer ceramic electronic component

Inactive Publication Date: 2012-06-14
SAMSUNG ELECTRO MECHANICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015]An aspect of the present invention provides a method of manufacturing perovskite powder in the form of microparticles with excellent crystallinity and favorable dispersion, including preparation of a high concentration and density metal oxide sol, as well as perovskite powder and a multilayer ceramic electronic component manufactured by the same.

Problems solved by technology

The solid phase method typically has disadvantages such as producing powder containing relatively large particles having a minimum particle size of about 1 micrometer, difficulties in controlling particle size, agglomeration of particles, contamination during the firing of particles, and the like, therefore, the solid phase method entails problems in the production of perovskite powder with regard to microparticles thereof.
In a variety of conventional processes, the tetragonality of dielectric particles generally deteriorates when the particle size thereof decreases.
If the particle size is reduced to less than 100 nm, it is very difficult to secure a desired crystal axial ratio (c / a).
Further, with a decrease in the size of powder particles, dispersion of the powder becomes more difficult.
Therefore, fine powder requires a high degree of dispersibility.
Due to the foregoing, synthesized perovskite powder entails problems such as poor morphology, broad particle size distribution, difficulties in dispersibility caused by the agglomeration of particles due to heat treatment, the generation of microfine particles after pulverization, and the like.
However, such a hydrothermal powder synthesis process has disadvantages in that a crystal structure has an oxygen site substituted by hydroxyl (—OH) group, causing defects such as the formation of pores.
Therefore, it is difficult to improve the crystallinity of synthesized particles.

Method used

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  • Method of manufacturing perovskite powder, perovskite powder manufactured by the same and multilayer ceramic electronic component
  • Method of manufacturing perovskite powder, perovskite powder manufactured by the same and multilayer ceramic electronic component
  • Method of manufacturing perovskite powder, perovskite powder manufactured by the same and multilayer ceramic electronic component

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Titania Nano Sol Using Acidic Peptizing Agent and Titanium Alkoxide

[0083]More than 5-fold volume of pure water was added to titanium isopropoxide and the mixture was hydrolyzed under agitation. After precipitating a titanium hydrate gel formed by hydrolysis, a supernatant was discarded and 10-fold weight of pure water was further added to the titanium hydrate gel. Then, the gel was washed under vacuum while agitating the same. In order to remove an organic material formed during washing, the foregoing procedures are repeated twice. A second supernatant was discarded again and a precipitate was passed through a filter paper. Then, pure water was added again to the obtained titanium hydrate in order to reach a molar concentration of 5M, followed by adding nitric acid to satisfy H+ / Ti=0.5. The mixture was subjected to peptization for 3 hours by increasing a temperature of the mixture in an extent of about 50° C. while agitating the same using a high viscosity agitator, t...

example 2

Preparation of Titania Nano Sol Using Acidic Peptizing Agent and Titanium Salt

[0084]More than 5-fold volume of pure water was gently added to titanium oxide dichloride (TiOCl2) under agitation, thus preparing a transparent solution. Ammonia water was slowly added to the solution to increase pH value, thus inducing gel reaction. Continuously adding ammonia water, the gel was dissolved to generate a precipitate containing titanium hydrate. While precipitating the formed titanium hydrate, a supernatant was discarded and 10-fold weight of pure water was added again to a titanium hydrate gel (that is, the precipitate). The mixture was washed under vacuum while agitating. These procedures are repeated six times. A peptizing process is conducted by the same procedures as described in Example 1. The prepared TiO2 sol exhibited a transmittance of 70%.

example 3

Preparation of Titania Nano Sol Using Alkaline Peptizing Agent and Titanium Alkoxide

[0085]More than 5-fold volume of pure water was gently added to titanium isopropoxide under agitation to conduct hydrolysis. After precipitating a titanium hydrate gel formed by hydrolysis, a supernatant was discarded and 10-fold weight of pure water was added again to the titanium hydrate gel. The mixture was washed under vacuum while agitating. In order to remove an organic material formed during washing, the foregoing procedures are repeated twice. A second supernatant was discarded again while a precipitate was passed through a filter paper. Then, pure water was added again to the obtained titanium hydrate in order to reach a molar concentration of 5M, followed by adding tetraethyl ammonium hydroxide to satisfy OH— / Ti=0.1. The mixture was subjected to peptization for 6 hours by increasing a temperature of the mixture in an extent of about 60° C. while agitating the same using a high viscosity agi...

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Abstract

There are provided a method of manufacturing perovskite powder, and perovskite powder and a multilayer ceramic electronic component manufactured thereof. The manufacturing method includes: washing metal oxide hydrate to remove impurities therefrom; adding pure water and an acid or a base to the metal oxide hydrate to prepare a metal oxide sol; mixing the metal oxide sol with a metal salt to form perovskite particle nuclei; and conducting grain growth of the perovskite particle nuclei by hydrothermal treatment to produce perovskite powder. The method of manufacturing perovskite powder and the perovskite powder manufactured by the same have advantages such as excellent crystallinity, reduced generation of fine powder, and favorable dispersion properties.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the priority of Korean Patent Application No. 10-2010-0126242 filed on Dec. 10, 2010, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a method of manufacturing perovskite powder in the form of microparticles with excellent crystallinity and favorable dispersion properties, by the preparation of a high concentration and high purity metal oxide sol, as well as perovskite powder and a multilayer ceramic electronic component manufactured by the same.[0004]2. Description of the Related Art[0005]Perovskite powder is a ferroelectric ceramic material and broadly used as a raw material of electronic components such as a multilayer chip capacitor (MLCC), a ceramic filter, a piezoelectric device, a ferroelectric memory, a thermistor, a varistor, and the like.[0006]Since elect...

Claims

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Application Information

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IPC IPC(8): H01G4/06C01F11/02C04B35/468B82B3/00B82Y30/00
CPCB82Y30/00C04B35/624C04B35/49C04B2235/3224C04B2235/3225C04B2235/3244C04B2235/5296C04B2235/5445C04B2235/5454C04B2235/5463C04B2235/765H01C7/008H01C17/06533H01G4/1245H01G4/30C01G23/003C01G23/006C01G23/053C01G23/0536C01P2002/34C01P2002/77C01P2004/03C01P2004/04C01P2004/32C01P2004/51C01P2004/62C01P2004/64C01P2006/12C01P2006/14C04B35/4682
Inventor PARK, KUM JINKIM, SANG HYUKBAEG, HYE YOUNGJEON, HYUNG JOONKWON, SANG HOONCHOI, CHANG HAK
Owner SAMSUNG ELECTRO MECHANICS CO LTD
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