Isotropic Compression Behavior of Lawsonite Under High-pressure Conditions

로소나이트(Lawsonite)의 압력에 따른 등방성 압축거동 연구

  • Im, Junhyuck (Department of Earth System Sciences, Yonsei University) ;
  • Lee, Yongjae (Department of Earth System Sciences, Yonsei University)
  • 임준혁 (연세대학교 지구시스템과학과) ;
  • 이용재 (연세대학교 지구시스템과학과)
  • Received : 2015.12.02
  • Accepted : 2016.02.29
  • Published : 2016.02.28


Powder samples of natural lawsonite (Ca-lawsonite, $CaAl_2Si_2O_7(OH)_2{\cdot}H_2O$) was studied structurally up to 8 GPa at room temperature using monochromatic synchrotron X-ray powder diffraction and a diamond anvil cell (DAC) with a methanol : ethanol : water (16 : 3 : 1 by volume) mixture solution as a penetrating pressure transmitting medium (PTM). Upon pressure increase, lawsonite does not show any apparent pressure induced expansion (PIE) or phase transition. Pressure-volume data were fitted to a second-order Birch-Murnaghan equation of state using a fixed pressure derivative of 4 leading to a bulk modulus ($B_0$) of 146(6) GPa. This compression is further characterized to be isotropic with calculated linear compressibilities of ${\beta}^a=0.0022GPa^{-1}$, ${\beta}^b=0.0024GPa^{-1}$, and ${\beta}^c=0.0020GPa^{-1}$.


Supported by : 미래창조과학부


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