Liquidus surface and isothermal section diagram at 973 K in BaO-Fe2O3-(0-50 mol%)B2O3 pseudo-ternary system

Abstract

The isothermal section at 973 K and the liquidus surfaces of the phase diagram of the pseudo-ternary BaO-Fe2O3-B2O3 system were determined in a composition range of less than 50 mol% B2O3 by thermal analyses and X-ray diffraction. The liquidus surface which is in equilibrium with Fe3O4 spreads over a wide composition range and that in equilibrium with BaO·6Fe2O3 extends long and narrow to BaO·B2O3. The pseudo-ternary BaO-Fe2O3-B2O3 compound does not exist in the composition range investigated. The ternary eutectic reaction is L→BaO·6Fe2O3+BaO·B2O 3+3BaO·B2O3, occurring at 1033 K at the composition 48 mol%BaO-19 mol%Fe2O3-33 mol%B2O3.