Crystal chemistry of kosmochlor-diopside solid solutions.
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- OHASHI HARUO
- National Institute for Researches in Inorganic Materials
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- FUJITA TAKETOSHI
- National Institute for Researches in Inorganic Materials
Bibliographic Information
- Other Title
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- コスモクロル輝石-透輝石固溶体の結晶化学
Description
Crystal structure parameters have been determined for Ko75 (NaCrSi2O6; 75 mol%) Di25 (CaMgSi2O6; 25mol%), Ko50 Di50 and Ko25 D75 synthesized at 1200°C and 20 kb. Refinements in space group C2/c using anisotropic temperature factors and over 600 unrejected reflections for each set of data resulted in weighted R-factors ranging from 0.020 to 0.025. The nearest M1-M1 distances of Ko-Di solid solutions are significantly shorter than those expected from the averaged ionic radii of cations occupying the M1 sites. The longest M1-M1 distances werer found for the crystals having the compositions corresponded to the both sides of the misibility gap at high pressure. It is expected that Cr+3 within Ko solid solutions form Cr-O-Cr coupling and Cr+3 within Di solid solutions are completely disordered. Ko75 Di25 and Ko50 Di50 being stable only at high pressure have smaller cell volumes than those expected from the values of Ko, Ko25 Di75 and Di. They have shorter M1-O distances than those expected from the averaged ionic radii of cations occupying the M1 sites. Their mean 8 (M2-O) and (M2-0) distances are longer than those expected from the values of Ko, Ko25 Di75 and Di. The characteristic structures of Ko75 Di25 and Ko50 Di50 may suggest at least party those at high pressure.
Journal
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- The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists
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The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists 74 (1), 16-26, 1979
Japan Association of Mineralogical Sciences
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Details 詳細情報について
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- CRID
- 1390282681194100224
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- NII Article ID
- 130003884359
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- ISSN
- 18830765
- 00214825
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- Text Lang
- en
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed