Title:
PIEZOELECTRIC MATERIAL AND METHOD FOR PRODUCING SAME, PIEZOELECTRIC ELEMENT, AND DEVICE USING PIEZOELECTRIC ELEMENT
Document Type and Number:
WIPO Patent Application WO/2016/103514
Kind Code:
A1
Abstract:
A piezoelectric material containing: a first component comprising a lead-free complex oxide having a perovskite structure, having a Curie temperature of Tc1, and comprising rhombohedral crystals in a single composition; a second component comprising a lead-free complex oxide having a perovskite structure, exhibiting a Curie temperature Tc2 lower than Tc1, and comprising rhombohedral crystals in a single composition; and a third component comprising a lead-free complex oxide differing from the second component, having a perovskite structure, having a Curie temperature Tc3 equal to or higher than Tc1, and comprising rhombohedral crystals in a single composition, just as the second component does. Furthermore, if the mole ratio of the third component to the total of the second and third components is α, and α×Tc3+(1-α)×Tc2=Tc4, |Tc4-Tc2| is 50°C or less.
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Inventors:
SUMI KOJI (JP)
KITADA KAZUYA (JP)
SAKAI TOMOHIRO (JP)
HAMADA YASUAKI (JP)
ISSHIKI TETSUYA (JP)
KIMURA SATOSHI (JP)
ITO AKIO (JP)
HANDA TSUNEO (JP)
KITADA KAZUYA (JP)
SAKAI TOMOHIRO (JP)
HAMADA YASUAKI (JP)
ISSHIKI TETSUYA (JP)
KIMURA SATOSHI (JP)
ITO AKIO (JP)
HANDA TSUNEO (JP)
Application Number:
PCT/JP2014/084701
Publication Date:
June 30, 2016
Filing Date:
December 26, 2014
Export Citation:
Assignee:
SEIKO EPSON CORP (JP)
International Classes:
H01L41/187; C04B35/00; H01L41/39
Foreign References:
| JP2011222884A | 2011-11-04 | |||
| JP2010241615A | 2010-10-28 |
Other References:
TOMOAKI KARAKI ET AL.: "Morphotropic Phase Boundary Slope of (K,Na,Li) NbO3-BaZrO3 Binary System Adjusted Using Third Component (Bi,Na) Ti03 Additive", JAPANESE JOURNAL OF APPLIED PHYSICS, vol. 52, no. 9Sl, 20 September 2013 (2013-09-20), pages 09KD11-1 - 09KD11-4, XP055377309, Retrieved from the Internet [retrieved on 20150312]
TADASHI TAKENAKA: "Current developments and future prospects of lead-free piezoelectric ceramics", MATERIALS INTEGRATION, vol. 22, no. 7, 25 June 2009 (2009-06-25), pages 1 - 24, XP008184807
See also references of EP 3240055A4
TADASHI TAKENAKA: "Current developments and future prospects of lead-free piezoelectric ceramics", MATERIALS INTEGRATION, vol. 22, no. 7, 25 June 2009 (2009-06-25), pages 1 - 24, XP008184807
See also references of EP 3240055A4
Attorney, Agent or Firm:
KURIHARA, Hiroyuki et al. (JP)
Hiroyuki Kurihara (JP)
Hiroyuki Kurihara (JP)
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