| 斜方辉石中不等效晶位 M1和 M2上 Fe2+离子能量差的计算和讨论 |
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| 引用本文： | 李哲.斜方辉石中不等效晶位 M1和 M2上 Fe2+离子能量差的计算和讨论[J].地质科学,1979,14(2):151-156. |
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| 作者姓名： | 李哲 |
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| 摘 要： | 引言戈斯（Ghose,S.）在测定斜方辉石的结构时,首次发现Fe2+离子择优占据M2晶位,而Mg2+离子择优占据M1晶位。这一事实,引起了矿物学家的极大注意。
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| 关 键 词： | , |
CALCULATIONS OF Fe2+ ION ENERGY DIFFERENCE ON CRYS- TALLOGRAPHICALLY INEQUIVALENT SITES Ml AND M2 IN ORTHOPYROXENES AND ITS DISCUSSION |
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| Li Zhe.CALCULATIONS OF Fe2+ ION ENERGY DIFFERENCE ON CRYS- TALLOGRAPHICALLY INEQUIVALENT SITES Ml AND M2 IN ORTHOPYROXENES AND ITS DISCUSSION[J].Chinese Journal of Geology,1979,14(2):151-156. |
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| Authors: | Li Zhe |
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| Abstract: | Extensive study has been made on orthopyroxenes by X-ray diffraction and Mossbauer resonance technique, and the intracrystalline distribution of Fe2+-Mg2+ over M1 and M2 sites has been determined. Fe2+ ion is strongly preferred at M2 site while Mg2+ at Ml site. Several workers have interpreted the orderly-disorderly kinetics in terms of ideal solution model and simple composite model.In this paper site distribution data are used to calculate the Fe2+ ion energy difference between Ml and M2 sites, by assuming Boltzmann distribution of ions over the sites and the blacking of sites as a result of preferential substitution. From the results calculated it is inferred that there are composition-dependence and temperature-dependence for Fe2+ ion energy difference △E12 between Ml and M2 sites in ortho-pyroxene. According to classical thermodynamics and kinetics Virgo and Hafne have given the value of activation energy E0 = 16.5 Kcal/mole for orderly process and ED = 20 kcal/mole for disorderly reaction, thereof △E = ED - E0 = 3.5 kcal/mole is in good agreement with our results. The value △E12 obtained in this work can also be used to interpret the influence of annealing temperature and compositional changes on relative site distribution. |
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