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Volume Relations in Na 2 O·B 2 O 3 and Na 2 O·SiO 2 B 2 O 3 , Melts at 1300·C
Author(s) -
RIEBLING E. F.
Publication year - 1967
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.1151-2916.1967.tb14970.x
Subject(s) - ternary operation , partial molar property , mole fraction , boron , molar volume , chemistry , volume (thermodynamics) , thermodynamics , viscosity , mineralogy , analytical chemistry (journal) , organic chemistry , physics , computer science , programming language
Density (and some viscosity) data are presented for binary sodium borate melts containing as much as 60 mole % Na 2 O and for ternary sodium silicoborate melts with B/Si <2.0 between 1000°C and 1300°C. The high‐temperature partial molar volume analysis of the binary sodium borate melts reveals about 50% BO 4 tetrahedra at the 40 mole % Na 2 O composition, in agreement with recent NMR estimates for the binary glasses. No “boron anomaly” was found near 18 mole % Na 2 O at high temperature. The synthetic partial molar volume model that agrees best with experiment for all ternary melts studied involves the presence of some BO 4 tetrahedra, the percentage of which varies with composition. This ternary model involves a high degree of internal consistency. No tendency toward extensive micro‐immiscibility was observed for ternary melts near the SiO 2 ·B 2 O 3 binary.