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Properties and Structure of Lanthanum Borate Glasses
Author(s) -
CHAKRABORTY INDRA N.,
SHELBY JAMES E.,
CONDRATE ROBERT A.
Publication year - 1984
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.1151-2916.1984.tb19700.x
Subject(s) - lanthanum , thermal expansion , boron , materials science , softening point , raman spectroscopy , glass transition , mineralogy , infrared spectroscopy , analytical chemistry (journal) , refractive index , atmospheric temperature range , inorganic chemistry , chemistry , polymer , thermodynamics , metallurgy , composite material , optics , organic chemistry , physics , optoelectronics
Glass formation limits were determined for the lanthanum borate glasses. Stable immiscibility prevents the formation of clear glasses over the range 0 to 20 mol% La 2 O 3 , but excellent quality glasses could be formed between 20 and 28 mol% La 2 O 3 . Data are reported for the density, refractive index, thermal expansion coefficient, glass transformation and dilatometric softening temperatures, transformation range viscosity, helium permeability, and chemical durability of these glasses. A limited Raman and infrared spectroscopy study suggests that lanthanum plays a similar structural role in these glasses and in the related crystals.