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Phase Equilibria in the System CaF 2 ‐AlF 3 ‐Na 3 AlF 6 and Part of the System CaF
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The complete phase‐equilibrium diagram of the system CaF
2
‐AlF
3
‐Na
3
AlF
6
and the subsolidus portion of the system CaF
2
‐AlF
3
‐Na
3
AlF
6
‐Al
2
O
3
were established from microscopic, powder X‐ray diffraction, quench, and DTA data obtained from samples encapsulated in sealed tubes and either reacted in the solid state or melted and recrystallized. The system Na
3
AlF
6
‐CaF
2
contains a simple eutectic with no compound formation or solid solution. The system CaF
2
‐AlF
3
‐Na
3
AlF
6
contains two ternary compounds, NaCaAlF
6
and NaCaAl
2
F
9
, which melt incongruently at 735° and 712°C, respectively; NaCaAlF
6
exists in three polymorphic forms with transitions at 610° and 722°C and NaCaAl
2
F
9
is body‐centered cubic with a
0
= 10.765 Å. The three binary and two ternary compounds divide the system into eight compatibility triangles. Along the NaCaAlF
6
‐Na
3
AlF
6
join, 7 mol% NaCaAlF
6
is soluble in α‐cryolite at 525° and 42% in β‐cryolite at 731°C. The quaternary system Na
3
AlF
6
‐AlF
3
‐CaF
2
‐Al
2
O
3
contains eight compatibility tetrahedra.
Title: Phase Equilibria in the System CaF
2
‐AlF
3
‐Na
3
AlF
6
and Part of the System CaF
Description:
The complete phase‐equilibrium diagram of the system CaF
2
‐AlF
3
‐Na
3
AlF
6
and the subsolidus portion of the system CaF
2
‐AlF
3
‐Na
3
AlF
6
‐Al
2
O
3
were established from microscopic, powder X‐ray diffraction, quench, and DTA data obtained from samples encapsulated in sealed tubes and either reacted in the solid state or melted and recrystallized.
The system Na
3
AlF
6
‐CaF
2
contains a simple eutectic with no compound formation or solid solution.
The system CaF
2
‐AlF
3
‐Na
3
AlF
6
contains two ternary compounds, NaCaAlF
6
and NaCaAl
2
F
9
, which melt incongruently at 735° and 712°C, respectively; NaCaAlF
6
exists in three polymorphic forms with transitions at 610° and 722°C and NaCaAl
2
F
9
is body‐centered cubic with a
0
= 10.
765 Å.
The three binary and two ternary compounds divide the system into eight compatibility triangles.
Along the NaCaAlF
6
‐Na
3
AlF
6
join, 7 mol% NaCaAlF
6
is soluble in α‐cryolite at 525° and 42% in β‐cryolite at 731°C.
The quaternary system Na
3
AlF
6
‐AlF
3
‐CaF
2
‐Al
2
O
3
contains eight compatibility tetrahedra.
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