Journal of the Mineralogical Society of Korea (한국광물학회지)

The Mineralogical Society of Korea (한국광물학회)
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A High Pressure Behavior Study of TiO2-complex

고압 하에서 TiO2 복합체의 거동에 대한 연구

  • Kim, Young-Ho (Department of Geology and Research Institute of Natural Science, Gyeongsang National University) ;
  • Kim, Sungjin (School of Advanced Materials & Engineering, Kumoh National Institute of Technology) ;
  • Choi, Jaeyoung (Department of Geology and Research Institute of Natural Science, Gyeongsang National University)
  • 김영호 (경상대학교 지질과학과 및 기초과학연구소) ;
  • 김성진 (금오공과대학교 신소재공학부) ;
  • 최재영 (경상대학교 지질과학과 및 기초과학연구소)
  • Received : 2017.09.05
  • Accepted : 2017.09.28
  • Published : 2017.09.30
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Abstract

High pressure has been applied to check the pressure effect on the powdered $TiO_2$-complex, which was synthesized for ultra-violet rays cutoff and antimicrobial applications. $TiO_2$-complex consists of anatase, rutile and silver chloride. Grain size was determined to be ~34 nm. Both anatase and rutile begin structural phase transitions to $ZrO_2$ (baddeleyite)-type crystal structures at 14~16 GPa, then sustain their phases up to 22.7 GPa. Under decompression to 0.0001 GPa (ambient pressure), rutile transforms to another phase with ${\alpha}-PbO_2$ structure, while anatase retains its high pressure structure upon complete decompression. Silver chloride peaks disappear at the low pressures.

자외선 차단기능과 제균 기능을 갖는 합성 $TiO_2$-복합체에 대해 압력의 영향을 체크하기 위해 고압실험을 시행하였다. 복합체 분말시료는 아나타제와 루틸 및 염화은으로 구성되어 있으며, 입자크기는 34 nm 정도로 결정되었다. 아나타제와 루틸 모두 약 14~16 GPa 구간에서 $ZrO_2$ (배델레이트)-형태의 결정구조로 상변이하며, 본 실험의 최고압력인 22.7 GPa까지 상변이는 계속된다. 압력을 모두 제거하여 상압 상태가 되면, 루틸은 ${\alpha}-PbO_2$ 구조로 상변이하며 아나타제는 고압의 $ZrO_2$-결정구조가 유지되는 것으로 판단된다. 염화은의 회절피크는 낮은 압력에서 사라지는 것이 관찰되었다.

Keywords

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