Refined crystal structure of lovozerite Na2CaZr[Si6O12(OH,O)6] • H2O

被引:14
作者
Yamnova, NA [1 ]
Egorov-Tismenko, YK [1 ]
Pekov, IV [1 ]
机构
[1] Moscow MV Lomonosov State Univ, Fac Geol, Moscow 119899, Russia
基金
俄罗斯基础研究基金会; 中国国家自然科学基金;
关键词
Radiation; Reflection; Crystal Structure; Diffraction Analysis; Thermal Parameter;
D O I
10.1134/1.1420822
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
The structure of Na,Ca,Zr-silicate lovozerite, Na2CaZr[Si6O12(OH,O)(6)]. H2O, from the Khibiny alkaline massif (the Kola Peninsula) was refined by single-crystal X-ray diffraction analysis (Syntex P (1) over bar diffractometer, lambda Mok(alpha) radiation, 2 theta/theta scanning technique), The refinement (R-hkl = 0.077, 1531 independent reflections; anisotropic thermal parameters) confirmed the trigonal system proposed for the mineral earlier (sp. gr. R3; a = 10.18(1) Angstrom, c = 13.13(2) Angstrom, Z = 3) and revealed the presence of two additional positions (C and B) statistically occupied by Ca and Na atoms (and partly by Mn) and H2O molecules, respectively. (C) 2001 MAIK ''Nauka/Interperiodica''.
引用
收藏
页码:937 / 941
页数:5
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Yamnova, NA ;
Egorov-Tismenko, YK ;
Pekov, IV ;
Ekimenkova, IA .
CRYSTALLOGRAPHY REPORTS, 2001, 46 (02) :190-193