Barium zirconate titanate ceramic material with low dielectric loss and preparation method thereof

A technology of barium zirconate titanate and ceramic materials, which is applied in the field of barium zirconate titanate ceramic materials and its preparation, and can solve problems such as unreachable, large dielectric loss, and failure to meet application requirements.

Inactive Publication Date: 2017-08-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Barium titanate (BaTiO 3 ) is a compound with a simple perovskite structure, but its dielectric loss is relatively large and cannot meet the application requirements. Therefore, solid solution or doping is usually used to improve its dielectric properties
TiO 3 with ZrO 2 The solid solution system formed is barium zirconate titanate (Ba(Ti 1-x Zr x )O 3 ), after replacing Ti ions by Zr ions, BaTiO 3 The dielectric constant has been greatly improved, but the dielectric loss of barium zirconate titanate is still relatively large (>10 -2 ), which cannot meet the requirements of practical applications. In addition, the sintering temperature of this system is also high (>1400°C)

Method used

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  • Barium zirconate titanate ceramic material with low dielectric loss and preparation method thereof
  • Barium zirconate titanate ceramic material with low dielectric loss and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] (1) BaCO 3 , CaCO 3 、TiO 2 , ZrO 2 According to the stoichiometric formula Ba 0.9 Ca 0.1 Ti 0.8 Zr 0.2 o 3 For batching, the ratio is: 15.4523g BaCO 3 , 0.8665g CaCO 3 , 5.5611gTiO 2 , 2.1443gZrO 2 , put about 20g of mixed powder into a nylon ball mill jar, add 200ml of deionized water, add 150g of zirconium balls, and mill on a planetary ball mill for 6 hours at a speed of 400 rpm;

[0021] (2) Place the ball-milled raw material in a drying oven, dry at 100°C, and then pass through a 40-mesh sieve;

[0022] (3) Put the sieved powder into a medium-temperature furnace, pre-fire at 1100°C, and keep it warm for 4 hours;

[0023] (4) Add 0.6wt.% Li to the pre-fired powder in step 3 2 CO 3 Mix, put into a ball mill jar, add zirconia balls and deionized water, ball mill for 12 hours, dry and sieve, then use a powder tablet press to press into a green body with a pressure of 4 MPa;

[0024] (5) The green body is sintered at 1350° C. and kept for 4 hours to prepa...

Embodiment 2-6

[0029] The sintering temperature and dielectric properties of the specific example are shown in Table 1, and the rest of the preparation process is exactly the same as that of Example 1.

[0030] Table 1

[0031]

[0032]

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Abstract

The invention discloses a barium zirconate titanate ceramic material with low dielectric loss. The chemical formula of the barium zirconate titanate ceramic material is Ba0.9Ca0.1Ti0.8Zr0.2O3+0.2-0.8wt.% Li2CO3 and is abbreviated as BCTZL. A preparation method of the barium zirconate titanate ceramic material includes: preparing BaCO3, CaCO3, TiO2 and ZrO2 according to the stoichiometric formula Ba0.9Ca0.1Ti0.8Zr0.2O3, performing ball milling, drying and sieving, pre-sintering at 1000-1200 DEG C, mixing the pre-sintered powder with 0.2-0.8wt.% Li2CO3, performing ball milling in a ball milling tank, drying, sieving, performing compression molding to obtain a green body, and sintering the green body at 1250-1325 DEG C to obtain the barium zirconate titanate ceramic material with low dielectric loss. The barium zirconate titanate ceramic material and the preparation method thereof have the advantages that the dielectric loss of the material is low and reaches 0.00548, the high dielectric constant of the material is high and reaches 6643, the sintering temperature (1250-1325 DEG C) of the preparation method is moderate, and the material can meet the needs, for constantly developing towards low power consumption, of electronic devices.

Description

technical field [0001] The invention belongs to a ceramic composition characterized by components, in particular to a barium zirconate titanate ceramic material with low dielectric loss and a preparation method thereof. Background technique [0002] Barium titanate (BaTiO 3 ) is a compound with a simple perovskite structure, but its dielectric loss is relatively large, which cannot meet the application requirements. Therefore, solid solution or doping is usually used to improve its dielectric properties. BaTiO 3 with ZrO 2 The solid solution system formed is barium zirconate titanate (Ba(Ti 1-x Zr x )O 3 ), after replacing Ti ions by Zr ions, BaTiO 3 The dielectric constant has been greatly improved, but the dielectric loss of barium zirconate titanate is still relatively large (>10 -2 ), which cannot meet the requirements of practical applications. In addition, the sintering temperature of this system is also high (>1400°C). [0003] CaTiO 3 It is also a comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/49
CPCC04B35/49C04B2235/3203C04B2235/3208C04B2235/3215C04B2235/442C04B2235/96
Inventor 李玲霞孙正卢特乔坚栗
Owner TIANJIN UNIV
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