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Multi-component system nonleaded piezoelectric ceramic with good performance

A lead-free piezoelectric and piezoelectric ceramic technology, applied in ceramics, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., can solve the problems of difficult polarization and difficult practical application, and achieve excellent piezoelectric iron The effect of electrical properties, excellent performance and stable process

Inactive Publication Date: 2006-02-15
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Simple Bi 0.5 Na 0.5 TiO 3 Ceramic coercive field is extremely large (73Kv / cm), polarization is difficult, and it is difficult to be practical, so Bi 0.5 Na 0.5 TiO 3 Modification to obtain lead-free piezoelectric ceramic system with low coercive field and good piezoelectric ferroelectric performance

Method used

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  • Multi-component system nonleaded piezoelectric ceramic with good performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] formula:

[0015] [0.96(Bi 0.96 La 0.04 ) 0.6 (Na 0.80 K 0.15 Li 0.05 ) 0.4 TiO 3 +0.2BaTiO 3 +0.1SrTiO 3 +0.1CaTiO 3 ](95-98wt%)+Fe 2 O 3 (2-5wt%)

[0016] Performance: d 33 (pC / N) tgδ(%) ε 33 / ε 0 k p (%) Qm Poisson's ratio

[0017] 153 2.9 863 18.6 89 0.291

Embodiment 2

[0019] formula:

[0020] [0.93(Bi 0.96 La 0.04 ) 0.5 (Na 0.875 K 0.05 Li 0.075 ) 0.5 TiO 3 +0.2BaTiO 3 +0.3SrTiO 3 +0.2CaTiO 3 ](92-98wt%)+Nb 2 O 5 (2-8wt%)

[0021] Performance: d 33 (pC / N) tgδ(%) ε 33 / ε 0 k p (%) Qm Poisson's ratio

[0022] 157 2.7 651 36.1 169 0.277

Embodiment 3

[0024] formula:

[0025] [0.96(Bi 0.98 La 0.02 ) 0.3 (Na 0.885 K 0.015 Li 0.10 ) 0.7 TiO 3 +0.1BaTiO 3 +0.1SrTiO 3 +0.2CaTiO 3 ](95-99wt%)+La 2 O 3 (1-2wt%)+Nb 2 O 5 (0-3wt%)

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

[0027] 203 4.3 1207 23.9 74 0.292

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Abstract

The polycomponent lead-free piezoelectric ceramic composition with excellent performance is one perovskite type environment consistency piezoelectric ceramic composition. The composition has the general expression of (1-e-f-g)(Bi1-uLu)1-w(Na1-x-yKxLiy)wTiO3+eBaTiO3+fSrTiO3+gCaTiO3+aMalphaObeta, where x is 0-1, y 0-0.5, u 0-0.12, (x+y) 0-1, e 0-1, f 0-1, g 0-1, (e+f+g) 0-1, w 0.3-0.7, L is RE elements La, Ce, Pr, Nd, Sm, etc.; 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, Zn, Cr, etc. with alpha and beta being atom number. The piezoelectric ceramic composition has d33 up to 200 pC / N, kp up to 36.0 % 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-element lead-free piezoelectric ceramic composition, which belongs to the field of piezoelectric ceramics with perovskite structure and environmental coordination. 2. Background technology [0002] Since the piezoelectricity of barium titanate ceramics was discovered in the mid-1940s, the structure is characterized by ABO 3 The research and development of piezoelectric ceramics is very active. Piezoelectric ceramics and the manufactured components have been widely used in industry, especially the information industry. Lead zirconate titanate (Pb(Ti, Zr)O 3 ) Is the lead-based binary system represented by the A position is Pb; the B position 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 ] Is representative, A position is Pb, B position is Mg 1 / 3 Nb 2 / 3 The lead-based ternary piezoelectr...

Claims

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Application Information

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