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Structure of B 2 O 3 and Binary Aluminoborate Melts at 1600°C
Author(s) -
RIEBLING E. F.
Publication year - 1966
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.1151-2916.1966.tb13139.x
Subject(s) - molar volume , viscosity , volume (thermodynamics) , boron , thermodynamics , chemistry , activation energy , aluminium , molar , mineralogy , atom (system on chip) , partial molar property , molar ratio , analytical chemistry (journal) , catalysis , organic chemistry , geology , paleontology , physics , computer science , embedded system
Viscosity and density data were obtained up to 1700°C for a series of binary aluminoborate melts that contained as much as 15 mole% (∼21 wt%) Al 2 O 3 and up to 1620°C for pure molten B 2 O 3 . Large expansion coefficient decreases and a slight activation energy increase for B 2 O 3 above 1400°C suggested a tightening of its structure. The addition of Al 2 O 3 reduced viscosity and increased activation energy. The decreased compositional dependence of molar volume (compared to SiO 2 additions) and the increased expansion coefficients accompanying Al 2 O 3 additions suggested a loosening of the O—B—O structure at 1600°C. Molar volume deviations from ideality were similar to but smaller than those for SiO 2 and GeO 2 additions at 1300°C. Microclustering of aluminum‐bearing polyhedra appeared to occur at slightly higher boron atom contents than with SiO 2 and GeO 2 additions.