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High‐Temperature Density Determination of Boron Oxide and Binary Rubidium and Cesium Borates
Author(s) -
LI PEICHING,
GHOSE ANIL C.,
SU GOUQJEN
Publication year - 1962
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.1151-2916.1962.tb11086.x
Subject(s) - rubidium , alkali metal , caesium , boron , boron oxide , volume (thermodynamics) , chemistry , analytical chemistry (journal) , oxide , atmospheric temperature range , inorganic chemistry , potassium , thermodynamics , chromatography , physics , organic chemistry
Density determinations of pure B 2 O 3 and binary rubidium and cesium borates have been made in the temperature ranges 450° to 1300°C and 500° to 1100°C respectively. The density of B 2 O 3 can be represented between 600° and 1000°C as d = 1.3388 + 228 (1/T) and for temperatures above 1000°C as d = 1.3947 + 157.9 (1/T), where d is in grams per milliliter and T is in °K. The volume expansion (dV/dT) in the alkali borate systems at 800°C increases with an increase of alkali oxide when the alkali concentration is more than 18 mole %. This increase in the volume expansion follows the order Cs > Rb > K > Na > Li. In the range 15 to 20 mole % alkali oxide a break in the volume expansion was observed. This break suggests a possible change in the structural configuration of the alkali borates.