Liquidus Surface and Isothermal Section Diagram at 1073 K in SrO–Fe₂O₃–(0∼50 mol%)B₂O₃ Pseudo-Ternary System

Abstract

The isothermal section at 1073 K and the liquidus surfaces of the phase diagram of the pseudo-ternary SrO–Fe₂O₃–B₂O₃ system were determined in a composition range of the B₂O₃ content less than 50 mol% by using the thermal analyses and X-ray diffraction. The liquidus surface which is in equilibrium with Fe₃O₄ sprends over a wide composition range and that in equilibrium with SrO·6Fe₂O₃ extends long and narrow to SrO·B₂O₃. The pseudo-ternary SrO–Fe₂O₃–B₂O₃ compound does not exist in the composition range investigated. The ternary eutectic reaction is L→SrO·6Fe₂O₃+SrO·B₂O₃+2SrO·B₂O₃, occurring at 1213 K at the composition 51 mol%SrO-18 mol%Fe₂O₃-31 mol%B₂O₃.