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

The Korea Association of Crystal Growth (한국결정성장학회)
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Fe doped $SrTiO_3$ single crystal growth and its electrical conductivity

Fe를 첨가한 $SrTiO_3$ 단결정 성장과 전기전도도 조사

  • Jeon, Byong-Sik (Department of Inorganic Materials Engineering, Hanyang University) ;
  • Cho, Hyun (Department of Inorganic Materials Engineering, Hanyang University) ;
  • Orr, Keun-Ho (Department of Inorganic Materials Engineering, Hanyang University)
  • 전병식 (한양대학교 무기재료공학과) ;
  • 조현 (한양대학교 무기재료공학과) ;
  • 오근호 (한양대학교 무기재료공학과)
  • Published : 1995.06.01
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Abstract

Abstract 0.2 wt % $Fe_2O_3$ doped $SrTiO_3$ single crystals were grown by floating zone method in air and Nz atmosphere, respectively. The growth rate was fixed at 5 mm/hr and rotation speed was maintained at 30 rpm. As - grown crystals were cut perpendicular to its growth direction and then, annealed at 900, 1000 and $1100^{\circ}C$ for 2 hours in Nz atmosphere. Resistivities of each samples were measured and then converted into conductivities. By using these conductivity values, the activation energies were calculated and by means of the calculated activation energies, mechanism which contribute to increasing the electrical conductivity were investigated.

99.9%의 $Fe_2O_3$ 를 0.2 wt% 첨가한 $SrTiO_3$ 단결정을 air 분위기와 질소분위기하에서 floating zone 법으로 성장시켰다. 성장속도는 5mm/hr 였으며 회전속도는 30rpm이었다. 육성한 결정을 성장방향에 수직하게 절단하여 준비한 시편을 질소분위기하에서 900, 1000, $1100^{\circ}C$에서 2시간동안 annealing한 후 비저항을 측정하였다. 측정한 비저항치를 전기전도도로 전환하고 이를 이용해 계산한 activation energy로서 전기전도도 향상기구를 설명하고자 하였다.

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