Инд. авторы:	Seryotkin Y.V., Bakakin V.V.
Заглавие:	Crystal structure of K-substituted gonnardite: separation of local water-cation assemblages
Библ. ссылка:	Seryotkin Y.V., Bakakin V.V. Crystal structure of K-substituted gonnardite: separation of local water-cation assemblages // Physics and Chemistry of Minerals. - 2014. - Vol.41. - Iss. 3. - P.173-180. - ISSN 0342-1791. - EISSN 1432-2021.
Внешние системы:	DOI: 10.1007/s00269-013-0635-z; РИНЦ: 21865956; SCOPUS: 2-s2.0-84894332729; WoS: 000331653800002;
Реферат:	eng: K-substituted gonnardite, K2.18Na0.04Ca0.02[Al2.26Si2.74O10]center dot 2.2H(2)O, was studied by X-ray powder diffraction method. The structure was refined with the Rietveld technique in the tetragonal space group with a = 13.65409(16), c = 6.56928(11) , V = 1224.74(2) (3), Z = 4. Most of K+ cations (1.94 apfu) statistically occupy three nearest positions to be considered as the split one. "Excess" cations are located in the position non-typical for K+. Statistics in the cation distribution is defined by the occupation of the additional position. Based on a crystal chemical positional model (C(2)R(2)A(2)) [T5O10], the separation of the local water-cation assemblages from an average statistical pattern has been suggested.
Ключевые слова:	PARANATROLITE; NATROLITE; Water-cation assemblages; ZEOLITES; Crystal structure; K-gonnardite; Zeolites; X-ray powder diffraction; TETRANATROLITE;
Издано:	2014
Физ. характеристика:	с.173-180