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Piezoelectric ceramic composition

A technology of piezoelectric ceramics and compositions, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, circuits, piezoelectric/electrostrictive/magnetostrictive devices, etc., can solve the problem of insufficient piezoelectric properties, etc. problem, to achieve the effect of low pollution

Active Publication Date: 2008-10-01
TDK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the actual situation is that these bismuth sodium titanate-based materials still cannot obtain sufficient piezoelectric properties compared with lead-based piezoelectric materials, and the piezoelectric properties need to be further improved.

Method used

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Examples

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Embodiment

[0054] Next, specific examples to which the present invention is applied will be described based on experimental results.

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Abstract

A piezoelectric ceramic composition that acquires excellent piezoelectric properties even when it is fired at a low temperature is offered. The piezoelectric ceramic composition possesses a composition corresponding to a solid solution that contains a first compound having a rhombohedral crystal-based perovskite structure, a second compound having a tetragonal crystal-based perovskite structure, and a third compound. The third compound is a compound oxide containing Bi as a first component element, Fe or Mn as a second component element, and a hexavalent metallic element as a third component element. The hexavalent metallic element is at least one kind selected from W and Mo.

Description

technical field [0001] The present invention relates to piezoelectric ceramic compositions widely used in the fields of actuators, sensors, resonators and the like. Background technique [0002] Piezoelectric materials (piezoelectric ceramic compositions) have the effect of generating strain (converting electrical energy into mechanical energy) by applying an external electric field and generating charges on the surface (converting mechanical energy into electrical energy) by external stress, and have been widely used in recent years. in various fields. For example lead zirconate titanate (Pb(Zr,Ti)O 3 :PZT) and other piezoelectric materials, for the applied voltage to generate 1×10 -10 The m / V level is roughly proportional to the strain, so it has excellent performance in small position adjustments, and can also be applied to fine adjustments in optical systems. In addition, in contrast to this, piezoelectric materials generate charges proportional to applied stress or t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462H01L41/187H01L41/39
CPCC04B35/462
Inventor 塚田岳夫古川正仁
Owner TDK CORP
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