Invention Grant
US08258679B2 Piezoelectric ceramic comprising a bismuth layered compound and piezoelectric element 有权
包含铋层状化合物和压电元件的压电陶瓷

  • Patent Title: Piezoelectric ceramic comprising a bismuth layered compound and piezoelectric element
  • Patent Title (中): 包含铋层状化合物和压电元件的压电陶瓷
  • Application No.: US12521113
    Application Date: 2007-12-21
  • Publication No.: US08258679B2
    Publication Date: 2012-09-04
  • Inventor: Shuuichi Fukuoka
  • Applicant: Shuuichi Fukuoka
  • Applicant Address: JP Kyoto
  • Assignee: Kyocera Corporation
  • Current Assignee: Kyocera Corporation
  • Current Assignee Address: JP Kyoto
  • Agency: DLA Piper LLP (US)
  • Priority: JP2006-348410 20061225; JP2007-279861 20071029
  • International Application: PCT/JP2007/074724 WO 20071221
  • International Announcement: WO2008/078703 WO 20080703
  • Main IPC: H01L41/187
  • IPC: H01L41/187 C04B35/00
Piezoelectric ceramic comprising a bismuth layered compound and piezoelectric element
Abstract:
The present invention provides a piezoelectric ceramic and a piezoelectric element, which have a large dynamic d33 (dynamic piezoelectric coefficient d33), can be used even under an elevated temperature of 200° C., and exhibit a small variation between the dynamic d33 at room temperature and the dynamic d33 at 200° C. The piezoelectric ceramic of the present invention is characterized by containing 100 parts by mass of a bismuth layered compound as a main component and a total of 0.05 to 1 part by mass, in terms of oxides (MnO2 and Fe2O3), of at least one of Mn and Fe, the bismuth layered compound being represented by a compositional formula of Bi4Ti3O3O12.β[(1-γ)M1TiO3.γM2M3O3], wherein β and γ satisfy the following formulae: 0.405≦β≦0.498 and 0≦γ≦0.3, M1 represents at least one selected from Sr, Ba, Ca, (Bi0.5Na0.5) (Bi0.5Li0.5) and (Bi0.5K0.5), M2 is at least one selected from Bi, Na, K and Li, and M3 is at least one of Fe and Nb.
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