CRYSTAL STRUCTURE AND COMPRESSIBILITY OF A TWO-LAYER POLYTYPE OF PSEUDOWOLLASTONITE (CASIO3)
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dc.contributor.author | Yang H. | |
dc.contributor.author | Prewitt C.T. | |
dc.date.accessioned | 2021-01-13T07:31:53Z | |
dc.date.available | 2021-01-13T07:31:53Z | |
dc.date.issued | 1999 | |
dc.identifier | https://elibrary.ru/item.asp?id=14048635 | |
dc.identifier.citation | American Mineralogist, 1999, , 11, 1902-1905 | |
dc.identifier.issn | 0003-004X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/22820 | |
dc.description.abstract | The crystal structure of a synthetic two-layer polytype of CaSiO 3 pseudowollastonite was determined using single-crystal X-ray diffraction data. It is monoclinic with space group C2/c and unit-cell parameters a = 11.8322(6), b = 6.8624(8), c = 10.5297(5) Aa, beta = 111.245(8) degrees , and V = 796.9(1) Aa 3 . The material is isostructural with two-layer SrSiO 3 and SrGeO 3 and has basic structural features similar to those found in four-layer CaSiO 3 pseudowollastonite, except for the stacking sequence of layers of CaO 6 octahedra and Si 3 O 9 ternary rings. The compressibility of the structure was measured up to 9.94 GPa and no phase transition was observed. With increasing pressure, all unit-cell parameters decrease nonlinearly with a positive curvature. The axial compression ratios at room pressure are beta a :beta b :beta c = 2.25:2.36:1.00 and the bulk modulus, K T , is 86(1) GPa with K' = delta K T /delta P = 3.8(4). | |
dc.title | CRYSTAL STRUCTURE AND COMPRESSIBILITY OF A TWO-LAYER POLYTYPE OF PSEUDOWOLLASTONITE (CASIO3) | |
dc.type | Статья |
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