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

A technology of BNT-BT-BMT and ceramic materials, applied in the field of perovskite structure piezoelectric ceramics, can solve the problems of low piezoelectric activity, difficulty in polarization, large coercive field, etc., and achieve various performance improvement effects
CN103102154AInactive Publication Date: 2013-05-15BEIJING UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
BEIJING UNIV OF TECH
Publication Date
2013-05-15
Estimated Expiration
Not applicable · inactive patent

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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.
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Description

technical field

[0001] The invention belongs to the field of perovskite structure piezoelectric ceramics, and relates to a new type of multi-component Bi with higher piezoelectric performance 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 It is a lead-free piezoelectric ceramic. Background technique

[0002] As a material sensitive to electricity, force, heat and light, piezoelectric ceramics are widely used in the fields of ultrasonic transducers, sensors, non-destructive testing and communication technology. Especially Pb(Ti,Zr)O zirconate titanate with excellent piezoelectric properties and high Curie temperature 3 After the successful development of ceramics, the structural feature is ABO 3 Lead-based perovskite piezoelectric ceramics have developed rapidly in recent years. Piezoelectric filters, micro-displacers, drivers and sensors made with it are widely used in satellite b...

Claims

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