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Density of Bi 2 O 3 –B 2 O 3 Binary Melts
Author(s) -
Hwang Chawon,
Fujino Shigeru,
Morinaga Kenji
Publication year - 2004
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.1551-2916.2004.01677.x
Subject(s) - molar volume , partial molar property , volume (thermodynamics) , molar , analytical chemistry (journal) , chemistry , binary system , content (measure theory) , binary number , mineralogy , thermodynamics , physics , chromatography , mathematics , geology , paleontology , mathematical analysis , arithmetic
The densities of x Bi 2 O 3 ·(100− x )B 2 O 3 binary melts ( x = 0–100 mol%) have been measured systematically in the temperature range of 973 to 1373 K using the Archimedean double‐bob method. In addition, the molar volume and coefficient of volume expansion have been determined from these density measurements. The density of melts in the Bi 2 O 3 –B 2 O 3 binary system decreased with increasing temperature for all compositions, and increased with increasing Bi 2 O 3 content. The molar volume calculated at 1273 K showed a minimum at around 20–30 mol% Bi 2 O 3 . The deviation of molar volume from ideality and the partial molar volumes of B 2 O 3 and Bi 2 O 3 single‐component melts were calculated, and the relationships between these properties and Bi 2 O 3 content were investigated. The Δ(MV) (deviation of molar volume from ideality) was negative in the Bi 2 O 3 –B 2 O 3 binary melts and showed a minimum of −7.5 cm 3 (−17.3%) at 40 mol% Bi 2 O 3 and 1273 K. The PMV (partial molar volume) of the B 2 O 3 melt decreased with increasing Bi 2 O 3 content, up to 70 mol% Bi 2 O 3 , and was constant above 70 mol% Bi 2 O 3 . The PMV of the Bi 2 O 3 melt was constant up to 30 mol% B 2 O 3 (considered from the viewpoint of Bi 2 O 3 ), and then decreased sharply with further addition of B 2 O 3 . The coefficient of volume expansion increased sharply up to 20 mol% Bi 2 O 3 and decreased with further addition of Bi 2 O 3 at 1273 K. From this result, it can be inferred that the temperature‐induced structural changes taking place in the melts are greatest at 20 mol% Bi 2 O 3 .