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Properties and Structure of Glasses in the System Bi 2 O 3 ‐SiO 2 ‐GeO 2
Author(s) -
TOPPING J. A.,
CAMERON N.,
MURTHY M. K.
Publication year - 1974
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.1151-2916.1974.tb10800.x
Subject(s) - molar volume , mineralogy , electrical resistivity and conductivity , ion , refractive index , analytical chemistry (journal) , materials science , coordination number , crystallography , chemistry , physics , thermodynamics , optoelectronics , organic chemistry , chromatography , quantum mechanics
In the system Bi 2 O 3 ‐SiO 2 ‐GeO 2 , good glasses can be formed only from limited compositional regions consisting of 2 narrow strips along the lines x Bi 2 O 3 ‐(100‐:t) GeO 2 ( x ≤40) and 40Bi 2 O 3 y SiO 2 (60‐ y )GeO 2 (mol%); such glass is dark brown. Compositions from a large region (Bi 2 O 3 content <40 mol%) showed immiscibility. In the binary system Bi 2 O 3 ‐GeO 2 , density and refractive index vary linearly with composition (mol%). Negative deviations of molar volume from ideality suggest that the coordination of a significant number of Ge ions is changing from 4‐fold to 6‐fold. Thermal expansion and electrical resistivity data are also reported.