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A large electrostrained lead-free bnt-bt-based ceramics

A BNT-BT, electro-strain technology, applied in the field of lead-free ferroelectric ceramic materials, can solve the problems of environmental pollution, harmful to human health, etc., and achieve the effect of great application prospects and excellent field-induced strain performance

Active Publication Date: 2020-11-20
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lead-based ceramics contain a large amount of lead, which pollutes the environment and is harmful to human health, which runs counter to an environmentally friendly society

Method used

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  • A large electrostrained lead-free bnt-bt-based ceramics
  • A large electrostrained lead-free bnt-bt-based ceramics
  • A large electrostrained lead-free bnt-bt-based ceramics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Composition: 0.94 (Bi 1 / 2 Na 1 / 2 )TiO 3 -0.06BaTiO 3 -0.0075Ba(Zn 1 / 3 Nb 2 / 3 )O 3

[0025] Process: First, ZnO and Nb 2 O 5 Combine to prepare ZnNb 2 O 6 ; Its preparation method is: according to the general chemical formula ZnNb 2 O 6 The raw materials are weighed at a stoichiometric ratio of, and the raw materials are ball-milled in ethanol to fully mix the raw materials uniformly. After the uniformly mixed raw materials are dried, they are placed in an alumina crucible and calcined at 800°C for 4 hours. Secondly, use chemically pure Na 2 CO 3 , Bi 2 O 3 , TiO 2 , BaCO 3 And the prepared ZnNb 2 O 6 Etc. as raw materials, according to the general formula (1-x)(Bi 1 / 2 Na 1 / 2 )TiO 3 -xBaTiO 3 -yBa(B 1 / 3 Nb 2 / 3 )O 3 (B=Zn) The stoichiometric ratio of the raw materials is weighed; the raw materials are ball-milled in ethanol to fully mix the raw materials uniformly, and the uniformly mixed raw materials are dried and put into an alumina crucible, and then calcined at 900°C, hol...

Embodiment 2

[0027] Composition: 0.93 (Bi 1 / 2 Na 1 / 2 )TiO 3 -0.07BaTiO 3 -0.01Ba(Zn 1 / 3 Nb 2 / 3 )O 3

[0028] Process: ZnNb 2 O 6 The calcination temperature is 850°C, the holding time is 2h; the calcination temperature of the general ceramic is 850°C, the sintering temperature is 1150°C, the holding time is 4h, and the pressure is 300MPa. Others are the same as in Example 1.

Embodiment 3

[0030] Composition: 0.91 (Bi 1 / 2 Na 1 / 2 )TiO 3 -0.09BaTiO 3 -0.02Ba(Zn 1 / 3 Nb 2 / 3 )O 3

[0031] Process: ZnNb 2 O 6 The calcination temperature is 800°C, the holding time is 3h; the calcination temperature of the general ceramic is 800°C, the sintering temperature is 1000°C, the holding time is 2h, and the pressure is 300MPa. Others are the same as in Example 1.

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PUM

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Abstract

The invention discloses a leadless BNT-BT substrate system with large electrostrictive strain and belongs to the field of leadless ferroelectric ceramic materials. The chemical formula of the leadlessBNT-BT substrate system is (1-x)(Bil / 1Nal / 2)TiO3-xBaTiO3-yBa(Znl / 3Nb2 / 3)O3, wherein x is 0.06-0.09; y is greater than 0 and less than or equal to 0.02; a sample is prepared by using a two-step method, namely ZnO or (MgCO3)4.Mg(OH)2.5H2O is combined with Nb2O5 to prepare ZnNB2O6(MgNb2O6) firstly, and secondly, by taking Na2CO3, BaCO3, TiO2, Bi2O3 and ZnNb2O6(MgNb2O6) as raw materials, a ternary leadless ferroelectric ceramic is prepared. The large electrostrictive strain is achieved, and requirements of micro displacement instruments on materials are met.

Description

Technical field [0001] The invention relates to the field of lead-free ferroelectric ceramic materials, in particular to a lead-free BNT-BT-based system ceramic with large electric strain. [0002] technical background [0003] Micro-displacement technology is a key technology in ultra-precision machining and testing, including micro-displacement devices, detection devices and control systems. With the development of the times, higher requirements are put forward for the positioning accuracy of precision components in the processing process. The demand for micro-displacement devices in the high-tech field is increasing, and they are becoming more and more important in micro-drive and micro-control technology. Status. Ferroelectric ceramics (electrostrictive ceramics) that can produce large strains induced by an electric field have the advantages of small size, large bearing capacity, high displacement resolution, and fast response speed. They are widely used in micro-displacers, s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/475C04B35/622
CPCC04B35/475C04B35/622C04B2235/3201C04B2235/3215C04B2235/3234C04B2235/3236C04B2235/3255C04B2235/3284C04B2235/72
Inventor 朱满康位秋梅李玲郑木鹏侯育冬
Owner BEIJING UNIV OF TECH
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