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Bi.Na.K.Li Ag titanate series lead-free piezoelectric ceramics

A sodium potassium bismuth titanate, lead-free piezoelectric technology, applied in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve polarization difficulties, large coercive fields, and low performance indicators and other problems, to achieve the effect of excellent piezoelectric performance, excellent piezoelectric performance and stable process

Inactive Publication Date: 2006-08-09
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects of the existing lead-free piezoelectric ceramics, such as extremely large coercive field (73Kv / cm), difficult polarization, and low performance index, and propose a new type of lead-free piezoelectric ceramics combination

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0013] The preparation process and conditions of the examples are as described above.

[0014] The general formula is Bi 0.5 (Na 1-x-y-z K x Li y Ag z ) 0.5 TiO 3 The formulation and performance indicators of the lead-free piezoelectric ceramics in the system are as follows:

Embodiment 1

[0016] When x=0.18, y=0.10, z=0.02, the composition formula of lead-free piezoelectric ceramics is:

[0017] Bi 0.5 (Na 0.70 K 0.18 Li 0.10 Ag 0.02 ) 0.5 TiO 3

[0018] d 33 (pC / N)

Embodiment 2

[0020] When x=0.20, y=0.075, z=0.075, the composition formula of lead-free piezoelectric ceramics is:

[0021] Bi 0.5 (Na 0.65 K 0.20 Li 0.075 Ag 0.075 ) 0.5 TiO 3

[0022] d 33 (pC / N)

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PUM

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Abstract

The invention relates to bismuth titanate natrium-potassium-lithium-silver series leadless piezoelectric ceramics. The general equation of the compound is Bi0.5(Na1-x-y-zKxLiyAgz)0.5TiO3+aM alpha O beta(wt%), and in the equation, 0 alpha Obeta is one or plural doping oxide. The main constituent is 0-5 of Bi0.5(Na1-x-y-zKxLiyAgz)SUB>0.5TiO3, M could be Na, K, Li, Ni, Zn, Cr, Co, Nb, Ta, Al, Cu, Fe, Ce, Pr, Nd, Sm, Gd, Dy, Er, Yb, In, Y, Sc, La, Ho, Lu, Sn, Sb, Mn, Ca, Ba, Sr, Mg, Si, Bi, Ag, etc. Alpha and beta mean the M element and atomicity corresponding to the relative oxide. The optimal value of the compound of d33 could be over 210pC / N, kp could be over 40%. And the technology is stable, and it would be made from traditional technology and raw material.

Description

1. Technical field [0001] The invention relates to a novel multi-component lead-free piezoelectric ceramic composition, which belongs to the field of piezoelectric ceramics with perovskite structure and environment coordination. 2. Background technology [0002] Since the discovery of the piezoelectricity of barium titanate ceramics in the mid-1940s, the structural feature is ABO 3 The research and development of perovskite piezoelectric ceramics is very active. Piezoelectric ceramics and piezoelectric ceramic devices have been widely used in industry, especially in the field of information industry. Components made of piezoelectric ceramics have penetrated into people's daily life. . Lead zirconate titanate (Pb(Ti, Zr)O 3 ) as the representative lead-based binary system and lead zirconate titanate (Pb(Ti, Zr)O 3 ) as the base, add the third component [such as lead magnesium niobate (Pb (Mg 1 / 3 Nb 2 / 3 )O 3 ) as the representative] lead-based ternary piezoelectric ceram...

Claims

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Application Information

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IPC IPC(8): C04B35/462C04B35/475H01L41/187
Inventor 赁敦敏肖定全朱建国余萍
Owner SICHUAN UNIV
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