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Optical anomaly in artificial cubic hieratite, K 2 [SiF 6 ]
Author(s) -
Göbel Ole F.,
ten Elshof Johan E.,
Kaminsky Werner,
Hannss Matthias
Publication year - 2015
Publication title -
acta crystallographica section b
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.604
H-Index - 33
ISSN - 2052-5206
DOI - 10.1107/s2052520615007507
Subject(s) - birefringence , tetragonal crystal system , polarizer , pyramid (geometry) , materials science , agar , optics , agar gel , anomaly (physics) , crystallography , condensed matter physics , chemistry , crystal structure , physics , geology , paleontology , biology , microbiology and biotechnology , bacteria
Crystals of K 2 [SiF 6 ] were grown in agar gel, silica gel and jelly. Crystals grown in agar gel or jelly exhibit birefringence and consist of six double refracting growth sectors, each having the shape of a tetragonal pyramid. Nevertheless, the structure of the crystals from agar gel could be refined as cubic (space group ) with a weighted R factor of 0.043. The amount of birefringence was estimated by the Senarmont compensation method and the rotating polarizer method.