Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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$SrTiO_3$ single crystal growth by floating zone method

Floating zone 법에 의한 $SrTiO_3$단결정 성장

  • Jeon, Byong-Sik (Dept. of Inorganic Materials Engineering, Hanyang University) ;
  • Cho, Hyun (Dept. of Inorganic Materials Engineering, Hanyang University) ;
  • Orr, Keun-Ho (Dept. of Inorganic Materials Engineering, Hanyang University)
  • 전병식 (한양대학교 무기재료공학과) ;
  • 조현 (한양대학교 무기재료공학과) ;
  • 오근호 (한양대학교 무기재료공학과)
  • Published : 1995.04.01
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Abstract

Strontium titanate single crystal was grown by floating wne method. Growth conditions are as follows; at air atmosphere, rotation rate of upper and lower shafts were 20 - 25 rpm, 15 - 20 rpm respectively and growth rate was 3 mmlhr. As grown crystal was light brown color and transparent. After annealing, color was faded away. Growth direction was [112] direction and it was confirmed that grown crystal has $SrTiO_3$single phase and stoichiometric composition by XRD and EDS. Etch pit pattern was investigated after chemical etching in $350^{\circ}C$, KOH solution for 5 min and dielectric constant was measured at the range of room temperature ~ $350^{\circ}C$ .

Floating zone법으로 strontium titanate 단결정을 육성하였다. 성장조건은 공기 분위기하에서 성장속도 3mm/hr, 상부축 회전속도 20~25rpm, 하부축 회전속도 15~20rpm이었으며 육성한 단결정은 옅은 갈색을 띄고 있었으며 투명하였고 annealing 후 색깔이 옅어짐을 확인할 수 있었다. 성장방위는 [112] 방향이었으며 XRD, EDS로 화학양론적인 조성은 $SrTiO_3$단일 결정상임을 알 수 있었다. $350^{\circ}C$, KOH용액에서 5분동안 chemical etching하여 etch pit pattern을 조사하였으며 상온하에서$350^{\circ}C$의 온도 범위에서 유전상수 값을 조사하였다.

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