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Sodium niobate/bismuth titanate lithium system leadless piezoelectric ceramic composition

A ceramic composition and lead-free piezoelectric technology, which is applied in the field of sodium niobate bismuth titanate lithium-based lead-free piezoelectric ceramic composition, can solve the problems of less research and achieve stable preparation process, high Curie temperature, high pressure The effect of excellent electrical performance

Inactive Publication Date: 2012-07-04
SICHUAN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, compared to the above four types of lead-free piezoelectric ceramics, regarding NaNbO 3 There are very few studies on lead-free ferroelectric piezoelectric ceramic materials

Method used

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  • Sodium niobate/bismuth titanate lithium system leadless piezoelectric ceramic composition
  • Sodium niobate/bismuth titanate lithium system leadless piezoelectric ceramic composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Formulation: 0.95NaNbO 3 -0.05Bi 0.5 Li 0.5 TiO 3

[0021] performance:

[0022] d 33 (pC / N) ε r k p (%) tanδ(%)

[0023] 54 290 17.5 5.80

Embodiment 2

[0025] Formulation: 0.925NaNbO 3 -0.075Bi 0.5 Li 0.5 TiO 3

[0026] performance:

[0027] d 33 (pC / N) ε r k p (%) tanδ(%)

[0028] 59 338 17.3 3.50

Embodiment 3

[0030] Formulation: 0.90NaNbO 3 -0.10Bi 0.5 Li 0.5 TiO 3

[0031] performance:

[0032] d 33 (pC / N) ε r k p (%) tanδ(%)

[0033] 46 443 11.4 1.50

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Abstract

The invention relates to a novel sodium niobate / bismuth titanate lithium system leadless piezoelectric ceramic composition containing perovskite antiferroelectric NaNbO3 and ABO3 compound Bi0.5Li0.5TiO3 with a general formula expressed as (1-x)NaNbO3-xBi0.5Li0.5TiO3, wherein x is great than or equal to 0.025 and less than or equal to 0.25. The leadless piezoelectric ceramic composition can also contain one or more oxides with a general formula of (1-x)NaNbO3-xBi0.5Li0.5TiO3((100-a) mol%)+MalphaObeta (a mol%), wherein MalphaObeta is one or more oxides, the molar ratio of the content a of MalphaObeta to the main component (1-x)NaNbO3-xBi0.5Li0.5TiO3 is 0-3%, M is an element with (+1)-(-6) valence and can be combined with oxygen to form a solid oxide, and alpha and beta are used for respectively expressing the atom numbers of the corresponding element M and oxygen in the related oxide. The system leadless piezoelectric ceramic composition obtained by adopting traditional piezoelectric ceramic preparing technology is characterized in that the optimal value d33 can be up to more than 50pC / N and the kp can be up to more than 15%, and has the advantages of high Curie temperature, good heat stability, good compactness and stable process.

Description

technical field [0001] The invention belongs to the field of perovskite structure piezoelectric ceramics, and relates to a novel multi-element niobate lead-free piezoelectric ceramic composition, in particular to a lead-free piezoelectric ceramic composition of sodium niobate bismuth titanate lithium series . Background technique [0002] Since the mid-1940s, the piezoelectricity of barium titanate ceramics was discovered, especially lead zirconate titanate Pb(Ti,Zr)O with excellent piezoelectric properties and high Curie temperature. 3 After the successful development of ceramics, the structural feature is ABO 3 The research and development of lead-based 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. lead zirconate titanate (Pb(Ti,Zr)O 3 ) as the representative lead-based binary system and lead zirconate titanate (Pb(Ti,Zr)O 3 )...

Claims

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Application Information

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IPC IPC(8): C04B35/495
Inventor 赁敦敏郑荞佶伍晓春
Owner SICHUAN NORMAL UNIVERSITY
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