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이철규 ( Lee Cheol Gyu ),송윤구 ( Song Yun Gu ),전철민 ( Jeon Cheol Min ),김신애 ( Kim Sin Ae ),성기훈 ( Seong Gi Hun ) 한국광물학회 2003 광물과 암석 (J.Miner.Soc.Korea) Vol.16 No.3
The Rietveld structure refinement for the natural trioctahedral mica, phlogopite-l M (Parker Mine, Quebec, Canada) has been done by high resolution neutron powder diffraction at 25℃ and -263℃. The structural formula of phlogopite determined by electron probe microanalysis is K₂(Mg_(4.46)Fe_(0.83)Al_(0.34)Ti_(0.22)) (Si_(5.51)Al_(2.49))O_(20)(OH_(3.59)F_(0.41)). Cell parameters are α=5.30-5.31 A, b=9.18-9.20 A, c=l0.18-10.21 A, β=l00.06-100.08˚. Refinements converged to R values in the range of R_(p)=2.35 -2.51%, R_(wp)=3.01 -3.18%, respectively. In this study, the OH bond length is calculated to 0.93 Å at room temperature and 1.03 Å at -263℃, and the angles between OH vector and (001) plane are obtained 9.4˚∼9.6˚. The decrease in the length of OH with the increase in temperature should be due to the hydrogen bonding in the structure of phogopite.