PIEZOELECTRIC PORCELAIN AND METHOD FOR PRODUCTION THEREOF

Title:

PIEZOELECTRIC PORCELAIN AND METHOD FOR PRODUCTION THEREOF

Document Type and Number:

WIPO Patent Application WO/2005/061413

Kind Code:

A1

Abstract:

A piezoelectric substrate (1) which comprises (1-m-n)&lcub Na_1-x-yK_xLi_y&rcub (Nb_1-zTa_z)O₃&rcub + m&lcub (M1)ZrO₃&rcub + n&lcub M2(Nb_1-wTa_w)₂O₆&rcub as a primary component, wherein M1 and M2 are alkaline earth metal elements, and wherein x, y, m and n preferably satisfy 0.1 ≤ x ≤ 0.9, 0 ≤ y ≤ 0.1, 0 < m < 0.1, and 0 < n ≤ 0.01; and a method for producing the piezoelectric substrate. The piezoelectric substrate can have a high Curie temperature and can generate a great displacement, and further the firing operation for the piezoelectric substrate can be carried out with ease. In the firing step, (M1)ZrO₃is first prepared and then is mixed with other materials. The piezoelectric substrate can be used for providing a piezoelectric porcelain which exhibits a wide range of service temperature, can exhibit a great displacement, can be produced through easy firing operation, and further is excellent from the view points of low pollution, the friendliness to the environment, and ecology.

Inventors:

FURUKAWA MASAHITO (JP)
NANAO MASARU (JP)
MUROSAWA SHOUGO (JP)
SATOU NAOYOSHI (JP)
KURODA TOMOFUMI (JP)

Application Number:

PCT/JP2004/019091

Publication Date:

July 07, 2005

Filing Date:

December 21, 2004

Export Citation:

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Assignee:

TDK CORP (JP)
FURUKAWA MASAHITO (JP)
NANAO MASARU (JP)
MUROSAWA SHOUGO (JP)
SATOU NAOYOSHI (JP)
KURODA TOMOFUMI (JP)

International Classes:

C04B35/495; H01L41/09; H01L41/187; C04B35/00; H01L41/22; H01L41/257; H01L41/39; (IPC1-7): C04B35/495; H01L41/187; H01L41/24

Domestic Patent References:

WO2002102738A1

2002-12-27

Foreign References:

JP2002160967A

2002-06-04

Other References: