Effect of glass transition: Density and thermal conductivity measurements of B2O3

Dmitry Chebykin, Hans Peter Heller, Ivan Saenko, Gert Bartzsch, Rie Endo, Olena Volkova

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The role of B2O3 as a fluxing agent for developing fluoride free fluxes has been accentuated in the recent years. Therefore, knowledge about thermophysical properties of the oxide are essential to find the optimal chemical composition of the mold fluxes. In the present study, the density and thermal conductivity of B2O3 were measured by means of the buoyancy method, the maximal bubble pressure (MBP) method and the hot-wire method in the temperature range of 295-1573 K. The results are discussed in the context of the chemical stability of the B2O3 as well as the effect of glass transition on the thermal conductivity. The density of the B2O3 decreases non-linearly with increasing temperature in the temperature range of 973-1573 K. The MBP method was successfully applied for the density measurements with a viscosity up to 91 Pa.s. The thermal conductivity of the B2O3 in the solid and molten states increases with increasing temperature. Based on the Kittel's equation, the temperature dependence of the thermal conductivity through the glass transition temperature of B2O3 was discussed.

Original languageEnglish
Pages (from-to)125-142
Number of pages18
JournalHigh Temperatures - High Pressures
Volume49
Issue number1-2
DOIs
Publication statusPublished - 2020
Externally publishedYes

Keywords

  • BO
  • Boron trioxide
  • Buoyancy method
  • Density
  • Glass transition
  • Hot-wire method
  • Maximum bubble pressure method
  • Thermal conductivity

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Physical and Theoretical Chemistry

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