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Title:
POTASSIUM BISMUTH TITANATE PIEZOELECTRIC BODY, METHOD FOR PRODUCING SAME, PIEZOELECTRIC ELEMENNT AND PIEZOELECTRIC FUNCTIONAL DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/172474
Kind Code:
A1
Abstract:
The present invention produces an ideal potassium bismuth titanate piezoelectric body by preventing volatilization of Bi and K, and provides an excellent lead-free piezoelectric body, a piezoelectric element and a piezoelectric functional device. A piezoelectric body which is characterized by: containing potassium bismuth titanate that has a tetragonal perovskite structure; being uniaxially oriented in the polarization axis direction; and satisfying the requirement such that the lattice constant ratio c/a is larger than 1.040 and/or the requirement such that the Curie temperature is higher than 380°C. A method for producing a potassium bismuth titanate piezoelectric body, wherein a substrate is immersed in a water-containing solvent that contains potassium hydroxide, a bismuth starting material and a titanium starting material, and heat and pressure are sequentially applied thereto in a reaction container, thereby depositing potassium bismuth titanate having a tetragonal perovskite structure on the substrate.

Inventors:
FUNAKUBO HIROSHI (JP)
KUROSAWA MINORU (JP)
ITO YOSHIHARU (JP)
TATEYAMA AKINORI (JP)
SHIRAISHI TAKAHISA (JP)
KUBOTA RURIKA (JP)
Application Number:
PCT/JP2021/007204
Publication Date:
September 02, 2021
Filing Date:
February 25, 2021
Export Citation:
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Assignee:
TOKYO INST TECH (JP)
International Classes:
C01G29/00; C04B35/462; C04B35/475; H01L41/09; H01L41/113; H01L41/187; H01L41/257; H01L41/317; H01L41/39; H02N2/02; H02N2/18
Foreign References:
JP2016163027A2016-09-05
JP2019121702A2019-07-22
CN107117960A2017-09-01
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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