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Thermal and optical properties of glasses of the system Bi 2 O 3 – B 2 O 3
Author(s) -
Becker P.
Publication year - 2003
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.200310009
Subject(s) - boron , glass transition , materials science , mineralogy , thermal expansion , crystallization , binary system , thermal , analytical chemistry (journal) , refractive index , powder diffraction , composition (language) , chemical composition , range (aeronautics) , binary number , hydrostatic weighing , thermodynamics , chemistry , crystallography , composite material , polymer , physics , mathematics , organic chemistry , linguistics , arithmetic , optoelectronics , philosophy , medicine , body weight
In the binary system Bi 2 O 3 – B 2 O 3 glasses were prepared in the composition range 57.5 mol% ‐ 80 mol% B 2 O 3 by defined slow cooling of large melt samples (about 75 cm 3 , each). Temperatures of crystallization, of melting and of glass transition were determined and density data of the glasses were derived using the hydrostatic weighting method. Thermal expansion coefficients and high precision refractive indices, together with their dispersion, were measured. The measured physical properties indicate subtle discontinuous structural changes of the glasses with glass composition, that match with the ranges of existence of the crystalline compounds of the binary system Bi 2 O 3 – B 2 O 3 . Thermal investigations together with X‐ray powder diffraction analyses of crystallized glass samples prove the so far doubtful existence of a borate compound named “BiBO 3 ” in the PDF within the composition range 52.5 – 57.5 mol% B 2 O 3 .