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Isomorphous Substitution for Silicon in Fluorphlogopite
Author(s) -
SCHATZ ELIHU A.
Publication year - 1963
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1963.tb11678.x
Subject(s) - mica , orthorhombic crystal system , boron , materials science , silicon , crystallography , crystal (programming language) , crystal structure , germanium , mineralogy , chemistry , composite material , metallurgy , organic chemistry , computer science , programming language
Attempts to substitute for silicon in the fluorphlogopite structure resulted in the synthesis of a fluorgermanium mica and a boron phosphate micalike orthorhombic crystal. The batch material contained Al 2 O 3 , MgO, MgF 2 , K 2 CO 3 , plus GeO 2 for forming the fluorgermanium mica and BPO 4 for forming the boron phosphate crystal. Optical analysis with a polarizing microscope and by X‐ray diffraction verified the mica structure of the germanium crystal and disproved the mica structure of the boron phosphate crystal. The indices of refraction and unit‐cell constants were determined for both crystals. A study of the electrical properties up to temperatures of 1000°F showed that the dielectric properties of the fluorgermanium mica were very similar to that of fluorphlogopite.