Density of Bi2O3-B2O3 binary melts

Chawon Hwang, Shigeru Fujino, Kenji Morinaga

    Research output: Contribution to journalArticle

    21 Citations (Scopus)

    Abstract

    The densities of xBi2O3·(100-x B2O3 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 Bi2O3-B2O3 binary system decreased with increasing temperature for all compositions, and increased with increasing Bi2O3 content. The molar volume calculated at 1273 K showed a minimum at around 20-30 mol% Bi2O3. The deviation of molar volume from ideality and the partial molar volumes of B2O3 and Bi2O3 single-component melts were calculated, and the relationships between these properties and Bi2O3 content were investigated. The Δ(MV) (deviation of molar volume from ideality) was negative in the Bi2O3-B2O3 binary melts and showed a minimum of -7.5 cm3 (-17.3%) at 40 mol% Bi2O3 and 1273 K. The PMV (partial molar volume) of the B2O3 melt decreased with increasing Bi2O3 content, up to 70 mol% Bi2O3, and was constant above 70 mol% Bi2O3. The PMV of the Bi2O3 melt was constant up to 30 mol% B2O3 (considered from the viewpoint of Bi2O3), and then decreased sharply with further addition of B2O3. The coefficient of volume expansion increased sharply up to 20 mol% Bi2O3 and decreased with further addition of Bi2O3 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% Bi2O3.

    Original languageEnglish
    Pages (from-to)1677-1682
    Number of pages6
    JournalJournal of the American Ceramic Society
    Volume87
    Issue number9
    DOIs
    Publication statusPublished - Jan 1 2004

    All Science Journal Classification (ASJC) codes

    • Ceramics and Composites
    • Geology
    • Geochemistry and Petrology
    • Materials Chemistry

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