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Density and Expansivity of Alkali Borates and Density Characteristics of Some Other Binary Glasses
Author(s) -
SHARTSIS L.,
CAPPS W.,
SPINNER S.
Publication year - 1953
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.1151-2916.1953.tb12833.x
Subject(s) - alkali metal , atmospheric temperature range , boron oxide , chemistry , boron , thermodynamics , maxima , volume (thermodynamics) , mineralogy , analytical chemistry (journal) , materials science , chromatography , organic chemistry , physics , art , performance art , art history
The densities of liquids in the systems Li 2 O–B 2 O 3 , Na 2 O–B 2 O 3 , and K 2 O–B 2 O 3 were measured by a counterbalanced‐sphere method over the approximate temperature range 600° to 1000°C. The room‐temperature densities of alkali borate glasses were also measured. Density increased with increasing percentages of alkali oxide below 30 mole %. At high temperatures the density‐composition curves showed maxima at about 30 mole % alkali oxide. Expansivities over various temperature ranges were calculated from change of density with temperature. Expansivities in the liquid range increased with alkali content. In the low‐alkali region, expansivity in the liquid range decreased with rising temperature whereas contrary behavior was noted in the high‐alkali region. The most striking effect caused by the addition of alkali to B 2 O 3 was a volume contraction. Some reasons were found to account for the lack of agreement with experimental observations of the methods of Huggins and Stevels for calculating densities.