Co-doped barium titanate ceramic dielectric material as well as preparation method and application thereof

A technology of ceramic dielectric materials and heterobarium titanate, which is applied in the field of ceramic media, can solve the problems of MLCC reliability reduction, reliability reduction, and grain boundary reduction, so as to improve remanent polarization, improve reliability, and suppress The effect of oxygen vacancies

Pending Publication Date: 2022-02-08
SHENZHEN INST OF ADVANCED ELECTRONICS MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, increasing the grain size with a certain thickness of the dielectric layer will lead to a decrease in the number of grain boundaries, which may lead to a decrease in the reliability of the MLCC
The factors leading to the reduction of reliability are more complicated, but generally it is caused by the migration of oxygen vacancies

Method used

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  • Co-doped barium titanate ceramic dielectric material as well as preparation method and application thereof
  • Co-doped barium titanate ceramic dielectric material as well as preparation method and application thereof
  • Co-doped barium titanate ceramic dielectric material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] In this example, the host material BaTiO 3 The particle size of the powder is 200nm (generally there is an error in the size calculated by the electron microscope, that is, 200±10nm is considered normal), the sintering temperature in a reducing atmosphere is 1200°C, the time is 2h, and the temperature is lowered to 950°C for reoxidation After treatment for 2 hours, the composition of the co-doped barium titanate ceramic dielectric material in this example is shown in Table 1, and the performance test of the prepared MLCC sample is shown in Table 2.

[0081] The formula table of table 1 embodiment 1

[0082]

[0083] The performance test result table of table 2 embodiment 1

[0084]

Embodiment 2

[0086] In this example, the host material BaTiO 3 The particle size of the powder is 150nm, the temperature of sintering in a reducing atmosphere is 1300°C, the time is 2h, and the temperature is lowered to 950°C for reoxidation treatment for 2h. The components of the co-doped barium titanate ceramic dielectric material in this example See Table 3, and see Table 4 for the performance tests of the prepared MLCC samples.

[0087] The formula table of table 3 embodiment 2

[0088]

[0089] The performance test result table of table 4 embodiment 2

[0090]

Embodiment 3

[0092] In this example, the host material BaTiO 3 The particle size of the powder is 150nm, the temperature of sintering in a reducing atmosphere is 1280°C, the time is 2h, and the temperature is lowered to 950°C for reoxidation treatment for 2h. The components of the co-doped barium titanate ceramic dielectric material in this example See Table 5, and see Table 6 for the performance tests of the prepared MLCC samples.

[0093] The formula table of table 5 embodiment 3

[0094]

[0095] The performance test result table of table 6 embodiment 3

[0096]

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Abstract

The invention discloses a co-doped barium titanate ceramic dielectric material, a preparation method and application of the co-doped barium titanate ceramic dielectric material in preparation of an electronic component. The co-doped barium titanate ceramic dielectric material takes 93-97 mol% of BaTiO3 as a main body material, and takes 3-7 mol% of a glass phase material, an anti-reducing agent, an alkali metal compound and a rare earth oxide as doping materials. The invention also discloses a multilayer ceramic capacitor prepared from the co-doped barium titanate ceramic dielectric material, the dielectric constant of the multilayer ceramic capacitor is between 2800 and 3900, the thickness of the dielectric layer is between 650 and 850nm, the room temperature resistivity can reach 8G omega.m, and the reliability meets the requirement of a life test. The co-doped barium titanate ceramic dielectric material and the capacitor provided by the invention are simple in preparation process, free of toxic substances, well matched with base metal inner electrodes such as nickel, compact in ceramic body, small in crystal grain, few in defect and wide in application prospect.

Description

technical field [0001] The invention relates to the technical field of ceramic media, in particular to a co-doped barium titanate ceramic dielectric material, a preparation method and an application thereof. Background technique [0002] Multilayer ceramic capacitors (MLCCs) are widely used in communication infrastructure circuits in the fields of communication equipment, automotive electronics, industrial equipment, and medical equipment. It can be used as power supply bypass capacitor, such as liquid crystal module (LCD driving voltage circuit), LSI / IC / OP amplifier with high power supply voltage, or as smoothing capacitor, such as DC-DC converter (input and output), switching power supply (two secondary side), etc. [0003] Barium titanate (BaTiO 3 ) is the base material of class II capacitors in MLCC, which has a high dielectric constant. In recent years, the miniaturization of mobile electronic equipment has made MLCC gradually develop in the direction of miniaturizat...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/622C04B35/64H01G4/12
CPCC04B35/468C04B35/622C04B35/64H01G4/1227C04B2235/3206C04B2235/3262C04B2235/3239C04B2235/3224Y02E60/13
Inventor 王朋飞张蕾于淑会黄雄孙蓉
Owner SHENZHEN INST OF ADVANCED ELECTRONICS MATERIALS
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