Author:
McCauley James W.,Newnham R. E.
Abstract
Abstract
The crystal structure of 1M-BaLiMg2AlSi3O10F2 has been determined from single-crystal diffractometer data and refined to an R value of 7.1% by least-squares methods. The synthetic barium mica belongs to the monoclinic space group C2/m with a = 5.2858(2), b = 9.1575(6), and c = 10.0375(5) Å, β = 100.124(4)° and Z = 2. There is no Li,Mg ordering in the octahedral sites or Al,Si ordering in the tetrahedral sites. The average bond lengths are (Al,Si)–O = 1.645, (Mg,Li)–O(F) = 2.066, inner Ba–O = 2.975, outer Ba–O = 3.192 Å. Compared to other micas, the large divalent barium ion reduces the interlayer separation and restricts rotation within the tetrahedral layer.
Subject
Inorganic Chemistry,Condensed Matter Physics,General Materials Science
Cited by
10 articles.
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