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Bismuth sodium lithium titanate barium titanate strontium titanate calcium titanate based lead-free piezoelectric ceramics

A bismuth sodium lithium titanate, lead-free piezoelectric technology, applied in ceramics, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., can solve the problems of difficult polarization and practical application, and achieve electric hysteresis Good loop rectangularity, excellent piezoelectric ferroelectric properties, excellent performance effects

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

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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  • Bismuth sodium lithium titanate barium titanate strontium titanate calcium titanate based lead-free piezoelectric ceramics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Formulation: [0.87Bi 0.5 (Na 0.925 Li 0.075 ) 0.5 TiO 3 +0.06BaTiO 3 +0.01SrTiO 3 +0.06CaTiO 3 ](97wt%)+Li 2 O(1wt%)+Y 2 o 3 (2wt%)

[0015] Performance: d 33 (pC / N) tgδ(%) ε 33 / ε 0 k p (%) Qm Poisson's ratio

[0016] 208 4.3 989 36.67 78 0.302

Embodiment 2

[0018] Formulation: [0.84Bi 0.5 (Na 0.925 Li 0.075 ) 0.5 TiO 3 +0.08BaTiO 3 +0.02SrTiO 3 +0.06CaTiO 3 ](97wt%)+Li 2 O(1wt%)+Fe 2 o 3 (2wt%)

[0019] Performance: d 33 (pC / N) tgδ(%) ε 33 / ε 0 k p (%) Qm Poisson's ratio

[0020] 168 3.8 1185 17.3 82 0.297

[0021] When u=0, the composition formula (1-y-z) Bi is formed (1-w) (Na 1-x Li x ) w TiO 3 +yBaTiO 3 +zSrTiO 3 or add dopant M α o β (wt%) lead-free piezoelectric ceramics.

Embodiment 3

[0023] Formulation: 0.92Bi 0.6 (Na 0.90 Li 0.10 ) 0.4 TiO 3 +0.06BaTiO 3 +0.02SrTiO 3

[0024] Performance: d 33 (pC / N) tgδ(%) ε 33 / ε 0 k p (%) Qm Poisson's ratio

[0025] 200 3.6 940 32.1 109 0.296

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Abstract

The lead-free bismuth sodium lithium barium strontium titanate piezoelectric ceramic is one polycomponent perovskite type environment consistency piezoelectric ceramic composition. The composition has the general expression of (1-y-z-u)Bi1-w(Na1-xLix)wTiO3+yBaTiO3+zSrTiO3+uCaTiO3+aMalphaObeta, where x is 0-0.5, y 0-1, z 0-1, u 0-1, (y+z+u) 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, Ni, Zn, etc. with alpha and beta being atom number. The piezoelectric ceramic composition has d33 up to 200 pC / N, kp up to 35.0 % 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 structural feature is ABO 3 The research and development of piezoelectric ceramics is very active. Piezoelectric ceramics and their components have been widely used in industry, especially in the field of information industry. Lead zirconate titanate (Pb(Ti, Zr)O 3 ) as the representative lead-based binary system, 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 ] as a representative, the A position is Pb, and the B position is Mg 1 / 3 Nb 2 / 3 The lead-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/465C04B35/475H01B3/12H10N30/853
Inventor 肖定全赁敦敏朱建国余萍李灵芝
Owner SICHUAN UNIV
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