한국광물학회지 (Journal of the Mineralogical Society of Korea)

  • 제25권2호
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  • Pages.77-84
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  • 2012
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  • 1225-309X(pISSN)
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  • 2288-7172(eISSN)
한국광물학회 (The Mineralogical Society of Korea)
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TiO2 아나타제에 대한 고압 상변이 연구

Phase Transition Studies on TiO2 anatase under High Pressure

  • 황길찬 (경상대학교 지구환경과학과 및 기초과학연구소) ;
  • 김영호 (경상대학교 지구환경과학과 및 기초과학연구소)
  • Hwang, Gil-Chan (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University) ;
  • Kim, Young-Ho (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University)
  • 투고 : 2012.03.22
  • 심사 : 2012.06.22
  • 발행 : 2012.06.30
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초록

$TiO_2$의 동질이상체 중 하나인 아나타제는 고압 하에서 결정의 크기와 모양에 따라 다른 상변이 경로를 보이는 것으로 알려져 있다. 본 실험에 이용된 아나타제 분말시료는 15~25 nm 정도 크기의 입자로 구성되어 있으며, 고압라만분광분석 결과와 고압 X-선회절실험결과 분석을 종합하면 20 GPa 이상의 압력에서 비정질로 상변이하는 것으로 관찰되었다. 상온에서 압력의 영향으로 상변이한 비정질 구조는 압력을 제거하여도 출발 결정구조로 회귀하지 않는 것으로 밝혀졌다. 이 결과는 베델레이트로 상변이하는 이전의 결과와 상치되며, 출발시료 구성입자의 분급상태가 입자의 불안정성에 영향을 끼쳐 최종적으로 비정질화에 기여한 것으로 판단된다.

Anatase, one of the $TiO_2$ polymorphs, is known to show different phase transition paths depending on its crystalline and shape. Particle size of 15~25 nm anatase has been subjected to high-pressure Raman spectroscopy and X-ray diffraction studies using a diamond anvil cell. We observe that the starting sample transforms to an amorphous phase above approx. 20 GPa, which is retained upon pressure release to ambient condition. This is in contrast to previously established transition to baddeleyite phase and we suspect difference in the particle distribution state trigger phase instability of nanoparticles and hence amorphization.

키워드

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피인용 문헌

  1. 합성 활석에 대한 압축 연구 vol.27, pp.4, 2012, https://doi.org/10.9727/jmsk.2014.27.4.283
  2. 고압 하에서 TiO2 복합체의 거동에 대한 연구 vol.30, pp.3, 2012, https://doi.org/10.9727/jmsk.2017.30.3.127