Korean Journal of Mineralogy and Petrology (광물과 암석)

The Petrological Society of Korea & The Mineralogical Society of Korea (한국암석학회 & 한국광물학회)
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A Study on Anisotropic Compression Behavior of Illite

일라이트의 비등방적 압축특성 연구

  • Yun, Seohee (Department of Earth System Sciences, Yonsei University) ;
  • Lee, Yongjae (Department of Earth System Sciences, Yonsei University)
  • 윤서희 (연세대학교 지구시스템과학과) ;
  • 이용재 (연세대학교 지구시스템과학과)
  • Received : 2020.01.22
  • Accepted : 2020.03.02
  • Published : 2020.03.31
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Abstract

High-pressure synchrotron X-ray powder diffraction experiments were performed on natural illite (K0.65Al2(Al0.65Si3.35)O10(OH)2) using diamond anvil cell (DAC) under two different pressure transmitting media (PTM), i.e., water and ME41 (methanol:ethanol = 4:1 by volume). When using water as PTM, occasional heating was applied up to about 250℃ while reaching pressure up to 2.7 GPa in order to promote both hydrostatic conditions and intercalation of water molecules into the layer. When using ME41, pressure was reached up to 6.9 GPa at room temperature. Under these conditions, illite did not show any expansion of interlayer distance or phase transitions. Pressure-volume data were used to derive bulk moduli (K0) of 45(3) GPa under water and 51(3) GPa under ME41 PTM. indicating no difference in compressibility within the analytical error. Linear compressibilities were then calculated to be βa = 0.0025, βb = 0.0029, βc = 0.0144 under ME41 PTM showing the c-axis is ca. six times more compressible than a- and b-axes. These elastic behaviors of illite were compared to muscovite, one of its structural analogues.

천연산 일라이트(K0.65Al2(Al0.65Si3.35)O10(OH)2) 분말 시료에 대해 물과 알코올(메탄올:에탄올 = 4:1 체적비, ME41)의 두 가지 압력매개체를 이용한 다이아몬드앤빌셀 고압 회절실험을 진행하였다. 물을 이용한 실험에서는 층간 유입을 유도하기 위해 약 250℃까지 열을 가하는 과정을 거치며 최대 약 2.7 GPa까지 압력을 가하였고, 알코올을 이용한 실험에서는 상온에서 최대 약 6.9 GPa까지 가압하면서 방사광 분말 회절법을 통해 시료의 압축특성을 관찰하였다. 위와 같은 조건에서는 층간의 확장이나 상전이는 관찰되지 않았다. 물과 알코올의 서로 다른 압력매개체 하에서 압축된 일라이트의 체적탄성률(K0)은 각각 45(3) GPa와 51(3) GPa로 도출되어 오차범위 내에서 크게 다르지 않음을 확인하였다. 또한 회절자료 분석결과 격자상수에 따른 선형압축률은 알코올 압력매개체일 때 βa, βb, βc의 값이 각각 0.0025 GPa-1, 0.0029 GPa-1, 0.0144 GPa-1로 도출되어 c-축의 압축률이 약 6배 큰 것으로 확인되었다. 본 연구에서 확인된 일라이트의 체적탄성률 및 선형압축률을 일라이트와 구조적으로 유사한 백운모와 비교하였다.

Keywords

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