Growth of $LiNbO_3$ single crystals and evaluation of the dependence of its piezoelectric properties on temperature

$LiNbO_3$단결정 성장 및 온도에 따른 압전 특성 평가

  • 정화구 (서울대학교 금속공학과) ;
  • 김병국 (서울대학교 금속공학과) ;
  • 강길영 (서울대학교 금속공학과) ;
  • 윤종규 (서울대학교 금속공학과)
  • Published : 1996.05.01

Abstract

Growth of $LiNbO_3$ single crystal by Czochralski method was carried out to study the piezoelectric effects. Piezoelectric coefficients and elastic compliances of the $LiNbO_3$ single crystal were determined by the resonance method of length-extentional mode of bar resonator from the room temperature up to $100^{\circ}C$. Two dielectric constants of $LiNbO_3$ were also determined by measuring the capacitance of the plate specimen. Measured constants were piezoelectric coefficients $d_{15},d_{22},d_{31},d_{33}$ elastic compliances $s^E_{11},s^E_{33},2s^E_{13}+2s^E_{44},s^E_{14}$ and dielectric constants $K^T_{11},K^T_{33}$. As temperature increased, elastic compliances changed very slowly while piezoelectric coeffiecients and dielectric constant $K^T_{33}$ changed very rapidly. Electromechanical coupling constant of zyw ($45^{\circ}C$)-bar was as high as 0.51 in room temperature and nearly constant up to $1000^{\circ}C$. The increase of piezoelectric coefficients was mainly due to the increase of dielectric permittivity.

Keywords

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