Phase Equilibria in the System CaF2-AlF3 |
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| Authors: | DOUGLAS F. CRAIG JESSE J. BROWN |
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| Affiliation: | Department of Materials Engineering, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 |
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| Abstract: | The phase diagram of the system CaF2-AlF3 was established from microscopic, powder X-ray diffraction, quench, and DTA data obtained from samples encapsulated in sealed Pt tubes and either reacted in the solid state or melted. Two compounds, CaAlF5 and Ca2AlF7, melted incongruently at 873°° 3° and 845°°3°C, respectively. Previously unreported Ca2AlF7 was successfully indexed as orthorhombic with α0= 18.22 Å, b 0=9.06 Å, and c 0= 7.11 Å. The only eutectic in the system exists at 836°° 3°C and 37.5 mol% AlF3. |
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