Leadless BNT-BT substrate system with large electrostrictive strain

A BNT-BT, electro-strain technology, applied in the field of lead-free BNT-BT-based systems, can solve problems such as harming human health and polluting the environment, and achieve the effect of great application prospects and excellent field-induced strain performance.

Active Publication Date: 2018-02-23
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 environmen

Method used

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  • Leadless BNT-BT substrate system with large electrostrictive strain
  • Leadless BNT-BT substrate system with large electrostrictive strain
  • Leadless BNT-BT substrate system with large electrostrictive strain

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Composition: 0.94 (Bi 1 / 2 Na 1 / 2 )TiO 3 -0.06BaTiO 3 -0.0075Ba(Zn 1 / 3 Nb 2 / 3 )O 3

[0023] Process: first combine ZnO with Nb 2 o 5 combined to prepare ZnNb 2 o 6 ; Its preparation method is: according to the general chemical formula ZnNb 2 o 6 Weigh the raw materials according to the stoichiometric molar ratio, ball mill the raw materials in ethanol to make the raw materials fully mixed and uniform, dry the uniform raw materials and put them into alumina crucibles, and calcinate at 800°C for 4 hours. Second, using chemically pure Na 2 CO 3 , Bi 2 o 3 ,TiO 2 , BaCO 3 and 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 The stoichiometric ratio of (B=Zn) weighs the raw materials; ball mill the raw materials in ethanol to fully mix the raw materials, dry the uniformly mixed raw materials and put them into an alumina crucible, and calcinate them at 900°C for a ...

Embodiment 2

[0025] Composition: 0.93(Bi 1 / 2 Na 1 / 2 )TiO 3 -0.07BaTiO 3 -0.01Ba(Zn 1 / 3 Nb 2 / 3 )O 3

[0026] Process: ZnNb 2 o 6 The calcination temperature is 850° C., and the holding time is 2 hours; the calcination temperature of the general ceramic is 850° C., the sintering temperature is 1150° C., the holding temperature is 4 hours, and the pressure is 300 MPa. Others are the same as in Example 1.

Embodiment 3

[0028] Composition: 0.91(Bi 1 / 2 Na 1 / 2 )TiO 3 -0.09BaTiO 3 -0.02Ba(Zn 1 / 3 Nb 2 / 3 )O 3

[0029] Process: ZnNb 2 o 6 The calcination temperature is 800° C., and the holding time is 3 hours; the calcination temperature of the general ceramic is 800° C., the sintering temperature is 1000° C., the holding temperature is 2 hours, and the pressure is 300 MPa. Others are the same as in Example 1.

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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 base system with large electrical strain. technical background [0002] 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 placed on the positioning accuracy of precision components during processing. The demand for micro-displacement devices in high-tech fields is increasing, and they are becoming more and more important in micro-drive and micro-control technology. status. Ferroelectric ceramics (electrostrictive ceramics), which can produce large strains through electric field induction, have the advantages of small size, large bearing capacity, high displacement resolution, and fast response speed, and are widely used in micro-displacers, sensors, brakes, and ...

Claims

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Application Information

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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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