RELATION OF MECHANICAL PROPERTIES TO THE STRUCTURE OF IONIC SOLIDS.
Quarterly rept. no. 4, 1 Mar-31 May 67,
PENNSYLVANIA STATE UNIV UNIVERSITY PARK MATERIALS RESEARCH LAB
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The crystal structure analysis and least squares refinement of fluorophlogopite R-factor 6.4 was completed in the centric space group C2m utilizing Hansons relative weighting scheme. The interatomic distances and thermal vibration amplitude features of the mica have been determined utilizing these refined parameters. NZ tests on the mica intensity data for a center of symmetry suggest the possibility that the material may be noncentric a study has been started in this respect. The use of absolute, semi-absolute and relative weighting schemes in least squares refinements with anisotropic vibration parameters is discussed with reference to a study on ruby. The Berg-Barrett x-ray technique was successfully employed to delineate the dislocations in the 001 plane of mica. Author
- Ceramics, Refractories and Glass