期刊
RUSSIAN JOURNAL OF INORGANIC CHEMISTRY
卷 53, 期 12, 页码 1845-1853出版社
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0036023608120048
关键词
alunite; El Gnater; Rietveld; infrared; Raman
The crystal structure of alunite (K(0.72),Na(0.28))Al(3)(SO(4))(2)(OH)(6) from El Gnater, central Tunisia, is refined by the Rietveld method. Raman and infrared data of this mineral are also given in order to provide some further information about the mineralogy and chemistry of this alunite. The crystal system is trigonal, space group R (3) over barm, with a=6.9834(4) angstrom. Final Rietveld refinement converges to R(p)=0.16, R(wp)=0.16, and R(Bragg)=0.07. In the alkalic site, the occupancy of potassium and sodium is refined to 72 and 28%, respectively. The Raman and infrared spectra are investigated in order to improve previous assignments of the observed frequencies, especially for tetrahedral and octahedral vibration and OH group, which are discussed on the basis of unit-cell group analysis and by comparison with previously observed wavenumbers of natrojarosite and synthetic alunite.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据