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High Pressure Behavior Study of the Apophyllite (KF)

고압 하에서 어안석(KF)의 거동 연구

  • Kim, Young-Ho (Department of Geology and Research Institute of Natural Sciences, Gyeongsang National University) ;
  • Choi, Jinwon (Department of Geology and Research Institute of Natural Sciences, Gyeongsang National University) ;
  • Heo, Sohee (Department of Geology and Research Institute of Natural Sciences, Gyeongsang National University) ;
  • Jeong, Nangyeong (Department of Geology and Research Institute of Natural Sciences, Gyeongsang National University) ;
  • Hwang, Gil Chan (Department of Earth System Sciences, Yonsei University)
  • 김영호 (경상대학교 지질과학과 및 기초과학연구소) ;
  • 최진원 (경상대학교 지질과학과 및 기초과학연구소) ;
  • 허소희 (경상대학교 지질과학과 및 기초과학연구소) ;
  • 정난경 (경상대학교 지질과학과 및 기초과학연구소) ;
  • 황길찬 (연세대학교 지구시스템과학과)
  • Received : 2015.12.04
  • Accepted : 2015.12.23
  • Published : 2015.12.30

Abstract

Apophyllite (KF)($K_{0.84}Ca_{3.99}Si_{7.70}O_{20}F_{0.72}{\cdot}8H_2O$), one of the sheet silicates, was compressed up to 7.7 GPa at ambient temperature and 15 high pressure data were obtained. Lattice parameters of the starting specimen were as follows: $a_0=8.954(2)\;{\AA}$, $c_0=15.795(2)\;{\AA}$, $V_0=1266.4(4)\;{\AA}^3$. Symmetrical diamond anvil cell was employed with synchrotron radiation in the mode of angular dispersive X-ray diffraction. Bulk modulus was determined to be 59(4) GPa when ${K_0}^{\prime}$ is 4. No clear first order phase transition symptom was observed in the series of XRD pattern. However, second-order phase transition cannot be ruled out from the correlation between normalized pressure and strain.

층상규산염광물인 천연산 어안석(KF)($K_{0.84}Ca_{3.99}Si_{7.70}O_{20}F_{0.72}{\cdot}8H_2O$)에 대한 고압실험을 상온에서 시행하였다. 출발시료의 격자상수 값은 다음과 같다: $a_0=8.954(2)\;{\AA}$, $c_0=15.795(2)\;{\AA}$, $V_0=1266.4(4)\;{\AA}^3$. 방사광과 대칭형 다이아몬드앤빌기기 및 각분산 X-선회절법을 이용하여 상온에서 7.7 GPa까지 15개의 고압 X-선회절데이터를 획득하였다. 어안석(KF)의 체적탄성률은 ${K_0}^{\prime}$을 4로 고정하였을 때 59(4) GPa로 계산되었다. 압력구간에서 1차상변이를 지시하는 근거는 관찰되지 않았으나, 2차 상변이에 대한 징후는 정규화압력 및 정규화응력변형 분석결과로부터 배제할 수 없다.

Keywords

References

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