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Application of the selected‐area channelling pattern technique to gypsum
Author(s) -
Girlich I.
Publication year - 1994
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170290530
Subject(s) - gypsum , channelling , crystallite , monoclinic crystal system , mineralogy , materials science , crystallography , scanning electron microscope , electron microscope , analytical chemistry (journal) , chemistry , crystal structure , composite material , optics , ion , physics , chromatography , organic chemistry
The applicability of the selected‐area channelling pattern (SACP) technique to gypsum single crystals and to polycrystalline gypsum samples is investigated. Suitable specimen preparation and choice of microscope parameters are proposed. In the case of gypsum single crystals it is observed that after some minutes of prolonged electron irradiation the structure is destroyed, and the pattern can no longer be detected. From a series of SACPs a monoclinic standard map for gypsum covering the pole triangles [100‐10 1 ‐3 11 ] and [0 1 0‐1 1 1‐ 21 0] is constructed and indexed. Practical problems of the technique occurring in polycrystalline samples are analysed.