RELATION OF MECHANICAL PROPERTIES TO THE STRUCTURE OF IONIC SOLIDS.
Quarterly rept. no. 7, 1 Dec 67-28 Feb 68,
PENNSYLVANIA STATE UNIV UNIVERSITY PARK MATERIALS RESEARCH LAB
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Bending experiments on micas confirm the existence of nonlinear stress-strain relationship in these ionic crystals. The crystal structure of synthetic 1M-BaLiMg2AlSi3O10F2 mica was refined by least squares and Fourier methods to an R-factor of 7.1 in space group C 2m. There is no ordering of lithium and magnesium in the two octahedral sites. The structures of fluorophlogopite and barium mica were compared and the differences analyzed in terms of local charge imbalance, the valency of the interlayer cation and decreased cation-cation repulsion in the octahedral sheet. The physical properties of these micas and others are analyzed in terms of their structural features. Author
- Ceramics, Refractories and Glass