RELATION OF MECHANICAL PROPERTIES TO THE STRUCTURE OF IONIC SOLIDS
Final technical rept. 1 Jun 1966-31 Jul 1969
PENNSYLVANIA STATE UNIV STATE COLLEGE MATERIALS RESEARCH LAB
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The crystal structures of KMg3AlSi3O10F2 and BaLiMg2AlSi3O10F2 were refined by least squares analysis of x-ray diffraction intensities. It is shown that the hardness, thermal stability and chemical resistance of various micas are related primarily to the interlayer structure and the amount of ditrigonal distortion. Making use of Langs x-ray topographic technique, partial dislocations were photographed in muscovite mica. This is the first time partial dislocations have been observed in mica. The various mechanical properties and the origin of the coarse corrugations which are often observed in muscovite have been explained in terms of the above partial dislocations.
- Geology, Geochemistry and Mineralogy