Piezoelectric ceramic composition and piezoelectric device

A technology of piezoelectric ceramics and piezoelectric devices, applied in piezoelectric/electrostrictive/magnetostrictive devices, manufacturing/assembly of piezoelectric/electrostrictive devices, piezoelectric devices/electrostrictive devices, etc., capable of Solve problems such as complex production methods and increased production costs

Inactive Publication Date: 2010-02-24
NGK SPARK PLUG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it is known that the piezoelectric distortion constant of anisotropic crystalline materials such as the bismuth layered structure ferroelectric material NBT can be improved by orienting the material into a specific The production method becomes complicated, which leads to an increase in production cost

Method used

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  • Piezoelectric ceramic composition and piezoelectric device
  • Piezoelectric ceramic composition and piezoelectric device
  • Piezoelectric ceramic composition and piezoelectric device

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0039] Sodium carbonate (Na 2 CO 3 ), bismuth oxide (Bi 2 o 3 ), titanium oxide (TiO 2 ), cobalt oxide (CoO) and lanthanide oxides (lanthanum oxide (La 2 o 3 ), cerium oxide (Ce 2 o 3 ), praseodymium oxide (Pr 2 o 3 ), neodymium oxide (Nd 2 o 3 ), ytterbium oxide (Yb 2 o 3 )) raw material powders to prepare various raw material powder mixtures. In various examples, to form 0.967 (Bi 0.5 Na 0.48 Bi 4 Ti 4 o 15 )-0.033CoO (wherein 0<Ln / (Na+Bi+Ln)≤0.04) piezoelectric ceramic composition is weighed as the final product. In Comparative Examples, raw materials were weighed in such a way that the following four compositions were formed.

[0040] (1) Bi 0.5 Na 0.5 Bi 4 Ti 4 o 15

[0041] (2)0.967(Bi 0.5 Na 0.48 Bi 4 Ti 4 o 15 )-0.033CoO

[0042] (3) Bi 0.5 Na 0.48 Bi 4 Ti 4 o 15 , where La / (Na+Bi+La)=0.002

[0043] (4) Bi 0.5 Na 0.48 Bi 4 Ti 4 o 15 , where La / (Na+Bi+La)=0.04

[0044] Each raw powder mixture was blended with ethanol and subjec...

experiment example 2

[0063] The piezoelectric device (piezoelectric ceramic composition) of Sample 3 of Experimental Example 1 and the piezoelectric devices of Samples 15 and 16 corresponding to those in which Group 2 elements Ba and Sr were added to the composition of Sample 3 (piezoelectric ceramic composition) were tested. The Curie temperature (Tc) of the ceramic composition) and the degree of deterioration of the piezoelectric distortion constant under heat treatment at 600° C. for 1 hour.

[0064] More specifically, the raw material powders used for Sample 3 were the same as those of Experimental Example 1. In Samples 15 and 16, raw materials were weighed in such a manner that the following compositions were formed as final products.

[0065] (1)0.967(Bi 0.5 Na 0.48 ) Bi 4 Ti 4 o 15 -0.033CoO, where La / (Na+Bi+La)=0.01, and (Bi 0.5 Na 0.48 ) replaced by 25 mol% of Ba

[0066] (2)0.967(Bi 0.5 Na 0.48 ) Bi 4 Ti 4 o 15 -0.033CoO, where La / (Na+Bi+La)=0.01, and (Bi 0.5 Na 0.48 ) rep...

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Abstract

Disclosed is a piezoelectric ceramic composition mainly composed of a bismuth lamellar compound containing Na, Bi, Co and an Ln (lanthanoid). Also disclosed is a piezoelectric ceramic composition mainly composed of a compound containing Na, Bi, Ti, Co and an Ln (lanthanoid) and having a crystal phase represented by Na0.5Bi4.5Ti4O15. The piezoelectric ceramic compositions are characterized in thatthe atomic ratio satisfies the following relation: 0 < Ln / (Na + Bi + Ln) = 0.04.

Description

technical field [0001] The present invention relates to a piezoelectric ceramic composition and a piezoelectric device using the same. Background technique [0002] Most piezoelectric ceramic materials currently used in practical use contain lead, represented by lead titanate (PT) and lead zirconate titanate (PZT). However, lead-containing piezoelectric ceramic materials raise concerns about the environmental impact of their lead components. In addition, lead-containing piezoelectric ceramic materials have a Curie point (Curie temperature) of about 200 to 500° C., and lose their piezoelectricity at temperatures higher than or equal to the Curie point, so that it is difficult to convert lead-containing piezoelectric ceramics into Materials are used in piezoceramic sensors whose operating temperatures are typically above 500°C. There is a need for lead-free piezoelectric ceramics usable above 500°C with less environmental impact and without loss of piezoelectricity. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/46H01L41/24H01L41/09H03H9/17H01L41/187H01L41/22H01L41/257H01L41/39
CPCC04B2235/3418C04B2235/3213C04B2235/3201C04B2235/3227C04B2235/3284C04B35/475H01L41/187C04B2235/3215C04B2235/3229C04B2235/3224C04B2235/3217C04B2235/3225C04B2235/3275H10N30/8561H10N30/097C04B35/46H10N30/853
Inventor 山崎正人伊藤浩平山际胜也光冈健
Owner NGK SPARK PLUG CO LTD
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