Dielectric and electromechanical properties of rare earth calcium oxyborate piezoelectric crystals at high temperatures

Fapeng Yu, Shujun Zhang, Xian Zhao, Duorong Yuan, Lifeng Qin, Qing Ming Wang, Thomas R. Shrout

Research output: Contribution to journalArticle

38 Scopus citations

Abstract

The electrical resistivity, dielectric, and electromechanical properties of ReCa4O(BO3)3 (ReCOB; Re = Er, Y, Gd, Sm, Nd, Pr, and La) piezoelectric crystals were investigated as a function of temperature up to 1000°C. Of the studied crystals, ErCOB and YCOB were found to possess extremely high resistivity (ρ): ρ > 3 × 10 7 Ω·cm at 1000°C. The property variation in ReCOB crystals is discussed with respect to their disordered structure. The highest electromechanical coupling factor k26 and piezoelectric coefficient d26 at 1000°C, were achieved in PrCOB crystals, with values being on the order of 24.7% and 13.1 pC/N, respectively. The high thermal stability of the electromechanical properties, with variation less than 25%, together with the low dielectric loss (<46%) and high mechanical quality factor (>1500) at elevated temperatures of 1000°C, make ErCOB, YCOB, and GdCOB crystals promising for ultrahigh temperature electromechanical applications.

Original languageEnglish (US)
Article number5750110
Pages (from-to)868-873
Number of pages6
JournalIEEE transactions on ultrasonics, ferroelectrics, and frequency control
Volume58
Issue number4
DOIs
StatePublished - Apr 1 2011

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Acoustics and Ultrasonics
  • Electrical and Electronic Engineering

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