Title:
PIEZOELECTRIC COMPOSITION AND PIEZOELECTRIC ELEMENT
Document Type and Number:
WIPO Patent Application WO/2018/180770
Kind Code:
A1
Abstract:
[Problem] To provide: a piezoelectric composition able to achieve a balance between mechanical strength and electromechanical coupling coefficient k31; and a piezoelectric element comprising the piezoelectric composition.
[Solution] A piezoelectric composition which contains manganese and a composite oxide having a perovskite structure represented by general formula ABO3, wherein the piezoelectric composition is characterized in that: the A site element in the ABO3 is potassium or potassium and sodium; the B site element is niobium; and in the piezoelectric composition, a variation exists in the concentration distribution of manganese, and this variation is 35-440% in terms of CV value.
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Inventors:
HIROSE MASAKAZU (JP)
HIROSE YUIKO (JP)
KATOH HIROKI (JP)
HIROSE YUIKO (JP)
KATOH HIROKI (JP)
Application Number:
PCT/JP2018/011037
Publication Date:
October 04, 2018
Filing Date:
March 20, 2018
Export Citation:
Assignee:
TDK CORP (JP)
International Classes:
C04B35/495; H01L41/083; H01L41/187; H01L41/43
Foreign References:
| JPS4956198A | 1974-05-31 |
Other References:
LIN, DUNMIN ET AL.: "Piezoelectric and ferroelectric properties of KxNa1-xNbO3 lead-free ceramics with MnO2 and CuO doping", JOURNAL OF ALLOYS AND COMPOUNDS, vol. 461, 6 August 2007 (2007-08-06), pages 273 - 278, XP022708719, DOI: doi:10.1016/j.jallcom.2007.06.128
MATSUMOTO, K. ET AL.: "Electric-field-induced strain in Mn-doped KNbO3 ferroelectric ceramics", CERAMICS INTERNATIONAL, vol. 34, 4 October 2007 (2007-10-04), pages 787 - 791, XP022623308, DOI: doi:10.1016/j.ceramint.2007.09.026
NAGATA, HAJIME ET AL.: "Fabrication and Electrical Properties of Mn-Doped KNbO3 Ceramics Synthesized from KHC03 as a Starting Material", JAPANESE JOURNAL OF APPLIED PHYSICS, vol. 51, 20 September 2012 (2012-09-20), pages 09LD05, XP055613093
MATSUMOTO, K. ET AL.: "Electric-field-induced strain in Mn-doped KNbO3 ferroelectric ceramics", CERAMICS INTERNATIONAL, vol. 34, 4 October 2007 (2007-10-04), pages 787 - 791, XP022623308, DOI: doi:10.1016/j.ceramint.2007.09.026
NAGATA, HAJIME ET AL.: "Fabrication and Electrical Properties of Mn-Doped KNbO3 Ceramics Synthesized from KHC03 as a Starting Material", JAPANESE JOURNAL OF APPLIED PHYSICS, vol. 51, 20 September 2012 (2012-09-20), pages 09LD05, XP055613093
Attorney, Agent or Firm:
MAEDA & SUZUKI (JP)
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