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

A bismuth sodium barium titanate and 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 excellent piezoelectricity The effect of electric ferroelectric performance, excellent performance and stable process

Inactive Publication Date: 2006-06-21
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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] formula:

[0014] 0.915 Bi 0.5 Na 0.5 TiO 3 +0.085(Ba 0.7 Sr 0.18 Ca 0.12 )TiO 3

[0015] performance:

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

[0017] 147 2.0 729 29.7 153 0.292

Embodiment 2

[0019] formula:

[0020] 0.935 Bi 0.3 Na 0.7 TiO 3 +0.065(Ba 0.62 Sr 0.23 Ca 0.15 )TiO 3

[0021] performance:

[0022] d 33 (pC / N) tgδ(%) ε 33 / ε 0 k p (%) Qm Poisson's ratio

[0023] 105 1.2 502 27.0 258 0.292

Embodiment 3

[0025] formula:

[0026] [0.9Bi 0.5 Na 0.5 TiO 3 +0.1(Ba 0.6 Sr 0.3 Ca 0.1 )TiO 3 ](95wt%)+Li 2 O (5wt%)

[0027] performance:

[0028] d 33 (pC / N) tgδ(%) ε 33 / ε 0 k p (%) Qm Poisson's ratio

[0029] 162 2.5 984 25.4 126 0.295

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PUM

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Abstract

The invention relates to a lead-free piezoelectric ceramic of bismuth sodium barium strontium calcium titanate, relates to a novel multi-element lead-free piezoelectric ceramic composition, and belongs to the field of perovskite structure-environment coordination piezoelectric ceramics. The lead-free piezoelectric ceramic that the present invention proposes can use general formula (1-z) Bi (1-w) Na w TiO 3 +z(Ba 1-x-y Sr x Ca y )TiO 3 +aM α o β (wt%), where 0<x<1, 0<y<1, 0<z<1, 0<(x+y)<1, 0.3≤w≤0.7, M α o β It is one or more doped oxides whose content a accounts for the main component (1-z) Bi (1-w) Na w TiO 3 +z(Ba 1-x-y Sr x Ca y )TiO 3 The weight ratio is 0-10%, M is an element with a valence of +1-+6 and can form a solid oxide with oxygen, such as 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, etc., α and β denotes the number of atoms of the corresponding element M and oxygen in the relevant oxide, respectively. The system piezoelectric ceramic composition d 33 Up to 160pC / N or more, k p It can reach more than 30.0%, its process is stable, it can be obtained by using traditional piezoelectric ceramic preparation technology and industrial raw materials, and it has practicability.

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 characteristics are 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 site is Pb; the B site is Ti, Zr and lead magnesium niobate-lead titanate [Pb(Mg 1 / 3 Nb 2 / 3 )O 3 -PbTiO 3 ] as the base material, add the third component, such as lead magnesium niobate (Pb (Mg 1 / 3 Nb 2 / 3 )O 3 ) as a representative, the A position is Pb, and the B position is Mg 1 / 3 Nb 2 / 3 ...

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