Faculty of Education, Yamanashi University, Kofu
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 using the thermal analyses and X-ray diffraction. The liquidus surface which is in equilibrium with Fe3O4 spreads over a wide composition range, while that in equilibrium with BaO⋅6Fe2O3 is long and tapers 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⋅B2O3+3BaO⋅B2O3, occurring at 1033 K at the composition 48 mol%BaO-19 mol%Fe2O3-33 mol%B2O3.
(Received August 28, 1995)
phase diagram, barium ferrite, liquidus surface, BaO-Fe2O3-B2O3 system, isothermal section
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