BNT-based piezoelectric ceramic and preparation method thereof

An electrical ceramics and base voltage technology, applied in the field of piezoelectric ceramics, can solve the problems of low high-voltage electrical performance and high leakage current, and achieve the effects of improving piezoelectric performance, reducing coercive field, and alleviating polarization difficulties.

Active Publication Date: 2018-09-28
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problems of low high voltage performance and high leakage current of the current binary system BNT-BT ceramics. The present invention provides a BNT-based piezoelectric ceramic, and the composition of the BNT-based piezoelectric ceramic is 0.93Bi 0.5 Na 0.5 TiO 3 -0.07BaTiO 3 :(0.1%-0.5%MoO 3 ), where Bi 0.5 Na 0.5 TiO 3 , BaTiO 3 The molar ratio is 0.93:0.07, MoO 3 Accounted for 0.93Bi 0.5 Na 0.5 TiO 3 -0.07BaTiO 3 0.1%-0.5% of the total molar amount

Method used

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  • BNT-based piezoelectric ceramic and preparation method thereof
  • BNT-based piezoelectric ceramic and preparation method thereof
  • BNT-based piezoelectric ceramic and preparation method thereof

Examples

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Embodiment 1

[0029] Example 1. The preparation method of BNT-based piezoelectric ceramics.

[0030] 1) in Bi 2 o 3 、Na 2 CO 3 、BaCO 3 、TiO 2 and MoO 3 As raw material, according to the general formula 0.93Bi 0.5 Na 0.5 TiO 3 -0.07BaTiO 3 :0.1%MoO 3 The stoichiometric ratio weighs each raw material;

[0031] 2) Set Bi 2 o 3 、Na 2 CO 3 、BaCO 3 、TiO 2After mixing with an appropriate amount of ethanol, perform ball milling for 12 hours. The amount of ethanol can be used to submerge the raw material (about 40ml) to obtain a slurry;

[0032] 3) Dry the slurry at 90°C for 2.5 hours, grind it, press it into a disc with a diameter of 30mm, put it into an alumina crucible, and sinter it at 800°C for 3 hours. This is the pre-sintering stage.

[0033] 4) Grind the pre-fired disc, then add the weighed MoO 3 Grind together evenly, add appropriate amount of ethanol, and ball mill for 12 hours for the second time.

[0034] 5) Dry the slurry after secondary ball milling at 90°C for 2.5 ...

Embodiment 2

[0038] Example 2. The preparation method of BNT-based piezoelectric ceramics. Repeat Example 1, the difference between this Example and Example 1 is that each raw material described in step 1) in this Example is according to 0.93Bi 0.5 Na 0.5 TiO 3 -0.07BaTiO 3 :0.2% MoO 3 Weigh each raw material for the stoichiometric ratio. Obtained BNT-based piezoelectric ceramics 0.93BNT-0.07BT: 0.2% MoO 3 .

Embodiment 3

[0039] Example 3. The preparation method of BNT-based piezoelectric ceramics. Repeat Example 1, the difference between this Example and Example 1 is that each raw material described in step 1) in this Example is according to 0.93Bi 0.5 Na 0.5 TiO 3 -0.07BaTiO 3 :0.3%MoO 3 Weigh each raw material for the stoichiometric ratio. Obtained BNT-based piezoelectric ceramics 0.93BNT-0.07BT: 0.3% MoO 3 .

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Abstract

The invention relates to BNT-based piezoelectric ceramic and a preparation method thereof and belongs to the technical field of piezoelectric ceramic. The BNT-based piezoelectric ceramic aims at solving the problems that for an existing binary-system BNT-BT ceramic, the high voltage performance is low, and the leakage current is high. The BNT-based piezoelectric ceramic is composed of 0.93Bi0.5Na0.5TiO3-0.07BaTiO3:(0.1%-0.5%MoO3), Bi2O3, Na2CO3, Ba2CO3 and TiO2 are used as raw materials, the raw materials are premixed, ball-milled, sintered, doped with MoO3, ball-milled for the second time, sintered and coated with a silver electrode, and the ceramic is obtained. The BNT-based piezoelectric ceramic is suitable for production of the piezoelectric ceramic with high voltage performance and low leakage current.

Description

technical field [0001] The invention relates to the technical field of piezoelectric ceramics, in particular to a BNT-based piezoelectric ceramic and a preparation method thereof. Background technique [0002] Piezoelectric ceramics are information functional materials that can convert mechanical energy and electrical energy. They are widely used in high-tech fields such as ultrasonic energy conversion, non-destructive testing, sensors, and electronic information. The products involve various industries such as automobiles, electronics, military, and medical care. . The development of piezoelectric technology is of great significance to the progress of science and technology and the improvement of people's living standards. At present, the most used in the market is Pb(Zr,Ti)O 3 (PZT) based piezoelectric ceramic materials. PZT-based piezoelectric ceramics have very excellent piezoelectric properties, and can meet many different performance requirements through doping modi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622C04B35/64H01L41/187H01L41/43
CPCC04B35/475C04B35/622C04B35/64C04B2235/3256C04B2235/5427C04B2235/3201C04B2235/3215H10N30/8561H10N30/097
Inventor 吴丰民林炜鹏王军军贺训军张春晓
Owner HARBIN UNIV OF SCI & TECH
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