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High‐Temperature Energy Relations in Borates: Alkaline‐Earth and Lead Borate Compounds and Their Glasses
Author(s) -
STEWART DANIEL R.,
RINDONE GUY E.
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.tb14623.x
Subject(s) - boron , alkaline earth metal , strontium , calorimetry , lithium borate , chemistry , thermochemistry , mineralogy , lattice energy , analytical chemistry (journal) , nitric acid , enthalpy , inorganic chemistry , alkali metal , thermodynamics , crystal structure , borate glass , crystallography , physics , organic chemistry , chromatography
The high‐temperature energy relations in some alkaline‐earth and lead borate glasses and compounds of the same compositions are reported. The data obtained with a continuous high‐temperature calorimeter and by solution calorimetry in 2 N nitric acid were combined to give heat content versus temperature curves from 25° to 1100°C. The heats of fusion, entropies of fusion, entropy changes vs. temperature, and the free‐energy changes from crystal to glass at 25°C are given. Previously unavailable X‐ray diffraction data for strontium diborate and calcium diborate are reported.