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Bi0.5Na0.5TiO3-BaTiO3-BiMg0.5Ti0.5O3 lead-free piezoelectric ceramic material

A BNT-BT-BMT, ceramic material technology, applied in the field of perovskite structure piezoelectric ceramics, can solve the problems of low piezoelectric activity, large coercive field, high electrical conductivity, and achieve the effect of improving various properties

Inactive Publication Date: 2014-07-02
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its low piezoelectric activity and large coercive field (73kV cm -1 ) and high electrical conductivity and difficult to polarize, so forming a multi-component solid solution system with other compounds has become an effective means to improve the performance of BNT ceramics

Method used

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  • Bi0.5Na0.5TiO3-BaTiO3-BiMg0.5Ti0.5O3 lead-free piezoelectric ceramic material
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  • Bi0.5Na0.5TiO3-BaTiO3-BiMg0.5Ti0.5O3 lead-free piezoelectric ceramic material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Recipe:

[0021] 0.9Bi 0.5 Na 0.5 TiO 3 -0.1BaTiO 3 -0BiMg 0.5 Ti 0.5 O 3

[0022] Process: calcination temperature 850°C, sintering temperature 1200°C.

Embodiment 2

[0024] Recipe:

[0025] 0.7Bi 0.5 Na 0.5 TiO 3 -0.30BaTiO 3 -0BiMg 0.5 Ti 0.5 O 3

[0026] Process: calcination temperature 900°C, sintering temperature 1100°C.

Embodiment 3

[0028] Recipe:

[0029] 0.7Bi 0.5 Na 0.5 TiO 3 -0.1BaTiO 3 -0.2BiMg 0.5 Ti 0.5 O 3

[0030] Process: calcination temperature 850°C, sintering temperature 1150°C.

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Abstract

The invention provides a Bi0.5Na0.5TiO3-BaTiO3-BiMg0.5Ti0.5O3 lead-free piezoelectric ceramic material, relates to a multicomponent system lead-free piezoelectric ceramic compound and belongs to the perovskite structure piezoelectric ceramic field. The composition provided by the invention can be expressed by a general formula of xBi0.5Na0.5TiO3-yBaTiO3-zBiMg0.5Ti0.5O3, wherein the numeric area of x, y and z is indicated by the shadow area of a ternary phase diagram (the area comprises the boundary line). The lead-free piezoelectric ceramic composition further contains oxide Bi2O3; and the content of oxide Bi2O3 is 1% of the content of Bi ions in the composition. The coercive field of the system changes with the three-component system components between 20kV / cm and 40 kV / cm; the piezoelectric coefficient d33 and the electromechanical coupling coefficient Kp are increased with the increase of the value of y in the polarizable component range; d33 is unequal from 100pC / N to 170 pC / N, while Kp is from 0.1 to 0.3. Besides, the depolarization temperature of the ceramics is slightly reduced between 80 DEG C and 120 DEG C with the increase of y.

Description

technical field [0001] The invention belongs to the field of piezoelectric ceramics with perovskite structure, and relates to a new type of multi-component Bi 0.5 Na 0.5 TiO 3 based lead-free piezoelectric ceramic materials, specifically xBi 0.5 Na 0.5 TiO 3 -yBaTiO 3 -zBiMg 0.5 Ti 0.5 O 3 Department of lead-free piezoelectric ceramics. Background technique [0002] Piezoelectric ceramics are widely used in the fields of ultrasonic transducer, sensor, non-destructive testing and communication technology as electricity, force, heat and light sensitive materials. Especially Pb(Ti, Zr)O zirconate titanate with excellent piezoelectric properties and high Curie temperature 3 After the successful development of the ceramic, the structural feature is ABO 3 Type lead-based perovskite piezoelectric ceramics have developed rapidly in recent years. Piezoelectric filters, microdisplacers, actuators and sensors made of them are widely used in satellite broadcasting, electronic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/475C04B35/622
Inventor 朱满康段成辉侯育冬刘晶冰王如志刘立英汪浩严辉
Owner BEIJING UNIV OF TECH