The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 14, 2015
Filed:
Mar. 09, 2011
Takayuki Hayashi, Nagano, JP;
Toshimitsu Aruga, Nagano, JP;
Makoto Matsukura, Hokuto, JP;
Yutaka Anzai, Hokuto, JP;
Akio Miyamoto, Hokuto, JP;
Sadao Matsumura, Hokuto, JP;
Yasunori Furukawa, Hokuto, JP;
Takayuki Hayashi, Nagano, JP;
Toshimitsu Aruga, Nagano, JP;
Makoto Matsukura, Hokuto, JP;
Yutaka Anzai, Hokuto, JP;
Akio Miyamoto, Hokuto, JP;
Sadao Matsumura, Hokuto, JP;
Yasunori Furukawa, Hokuto, JP;
Citizen Finetech Miyota Co., Ltd., Nagano, JP;
Abstract
In accordance with the present invention, there is provided a method for producing a single LTGA crystal from a polycrystalline starting material prepared from a mixture of LaO, TaO, GaO, and AlO, wherein a mixture having a composition represented by y(LaO)+(1−x−y−z)(TaO)+z(GaO)+x(AlO) (in the formula, 0<x≦0.40/9, 3.00/9<y≦3.23/9, and 5.00/9≦z<5.50/9) is used as the polycrystalline starting material, and a single LTGA crystal is grown using the Z-axis as a crystal growth axis. The grown LTGA single crystal is preferably subjected to a vacuum heat treatment. The single LTGA crystal grown by the method according to the present invention, which is highly insulative and highly stable, can be utilized in such applications as a piezoelectric element of a highly reliable combustion pressure sensor useful in measurement of a combustion pressure in a combustion chamber of an internal combustion engine.