한국광물학회지 (Journal of the Mineralogical Society of Korea)

  • 제23권3호
  • /
  • Pages.267-272
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  • 2010
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  • 1225-309X(pISSN)
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  • 2288-7172(eISSN)
한국광물학회 (The Mineralogical Society of Korea)
권호 표지

${\alpha}$-크리스토발라이트 구조의 $GaPO_4$에 대한 고압 상변이 연구

High Pressure Phase Transition Study of ${\alpha}$-cristobalite $GaPO_4$

  • 황길찬 (경상대학교 지구환경과학과) ;
  • 김영호 (경상대학교 지구환경과학과)
  • Hwang, Gil-Chan (Department of Earth and Environment Sciences, Gyeongsang National University) ;
  • Kim, Young-Ho (Department of Earth and Environment Sciences, Gyeongsang National University)
  • 투고 : 2010.09.14
  • 심사 : 2010.09.28
  • 발행 : 2010.09.30
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초록

${\alpha}$-크리스토발라이트 구조의 $GaPO_4$에 대한 고압 x-선 회절 실험을 상온에서 8.9 GPa까지 시행하였다. 정방정계에 속하는 출발결정구조는 1 GPa 이하의 압력에서 회절피크가 분리되는 변화를 보이는데, 아마도 망상구조를 이루고 있는 사면체의 방향성이 압력에 의해 흐트러지면서 상-I'로 상변이가 유도된 것 같다. 압력을 증가시키면, 상-I'는 2 GPa와 3 GPa 사이에서 정방정계에 속하는 고압상(상-III)으로 상변이를 하고 있다. 이 결과는 최근 동일한 시료를 이용하여 얻은 고압실험결과(Ming et al., 2007)와 일치하지 않는다. 최고압력에 도달한 다음, 압력을 대기압으로 내리면 상-III이 그대로 유지되는 것으로 나타났다.

High pressure x-ray diffraction patterns of ${\alpha}$-cristobalite gallium phosphate ($GaPO_4$) were acquired up to 8.9 GPa at room temperature using Mao-Bell type diamond anvil cell with high flux synchrotron radiation. Starting orthorhombic phase (phase-I) shows the splitting of peak which is possibly resulted from the pressure induced orientation disorder of the framework structure of tetrahedra. This is designated as phase-I'. This phase transforms to the orthorhombic high pressure phase-III between 2 and 3 GPa. Present phase transition sequence is not in accord with the recent high pressure X-ray diffraction results performed on the same starting sample (Ming et al., 2007). X-ray pattern of the unloaded sample to ambient pressure shows that the structure retains that of the high pressure phase prior to decompression.

키워드

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