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Sodium bismuth titanate base nonleaded piezoelectric ceramic

A bismuth sodium titanate-based, lead-free piezoelectric technology, applied in ceramics, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., can solve problems such as volatile, human and ecological environment pollution and hazards, Achieve the effects of excellent performance, stable process, and excellent piezoelectric ferroelectric performance

Inactive Publication Date: 2004-11-03
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

PbO or Pb 3 o 4 It is volatile at high temperature, so that lead-based piezoelectric ceramics will cause serious pollution and harm to human beings and the ecological environment in the process of production, use and disposal.

Method used

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  • Sodium bismuth titanate base nonleaded piezoelectric ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] formula:

[0018] [0.82Bi 0.5 Na 0.5 TiO 3 +0.15Bi 0.5 K 0.5 TiO 3 +0.02BaTiO 3 +0.01SrTiO 3 ](95wt%)+Y 2 o 3 (5wt%)

[0019] performance:

[0020] d 33 (pC / N) tgδ(%) ε 33 / ε 0 k p (%) Qm Poisson's ratio

[0021] 186 3.3 1089 24.0 78 0.286

Embodiment 2

[0023] formula:

[0024] [0.78Bi 0.6 Na 0.4 TiO 3 +0.15Bi 0.5 K 0.5 TiO 3 +0.02BaTiO 3 +0.05SrTiO 3 ](99wt%)+Na 2 O (1wt%)

[0025] performance:

[0026] d 33 (pC / N) tgδ(%) ε 33 / ε 0 k p (%) Qm Poisson's ratio

[0027] 169 3.9 1208 19.6 67 0.292

Embodiment 3

[0029] formula:

[0030] [0.68Bi 0.6 Na 0.4 TiO 3 +0.15Bi 0.5 K 0.5 TiO 3 +0.02BaTiO 3 +0.15SrTiO 3 ](96wt%)+Li 2 O (4wt%)

[0031] performance:

[0032] d 33 (pC / N) tgδ(%) ε 33 / ε 0 k p (%) Qm Poisson's ratio

[0033] 192 4.3 1227 24.6 77 0.288

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Abstract

The lead-free bismuth sodium titanate piezoelectric ceramic composition is one perovskite type environment consistency piezoelectric ceramic composition. The composition has the general expression of (1-x-y-z)Bi1-wNawTiO3+xBi0.5K0.5TiO3+yBaTiO3+zSrTiO3+aMalphaObeta, where x is 0-1, y 0-1, z 0-1, (x+y+z) 0-1, w 0.3-0.7; MalphaObeta is doping oxide(s) in the content an of 0-10 %; M is +1~+6 valent element capable of forming solid oxide, such as Na, K, Li, Al, Cu, etc. with alpha and beta being atom number. The piezoelectric ceramic composition has d33 up to 190 pC / N, kp up to 24.0 % and stable technological process, may be produced via traditional piezoelectric ceramic preparation process and industrial material, and is practical.

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 research and development of piezoelectric ceramics with structural characteristics of AB O3 has been very active. Piezoelectric ceramics and their components have been widely used in industrial special applications. Is the field of information industry. Lead zirconate titanate (Pb(Ti, Zr)O 3 ) as the representative lead-based binary system, the A site is Pb; the B site is Ti, Zr and lead zirconate titanate (Pb(Ti, Zr)O 3 ) as the base material, add the third component, such as lead magnesium niobate-lead titanate [Pb(Mg 1 / 3 Nb 2 / 3 )O 3 -PbTiO 3 ] as a representative, the A position is Pb, and the B position is Mg 1 / 3 ...

Claims

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Application Information

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IPC IPC(8): C04B35/462C04B35/465C04B35/475H01B3/12H01L41/187
Inventor 肖定全赁敦敏朱建国余萍李灵芝
Owner SICHUAN UNIV
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