AlF3

Formula : AlF3

Family: 
Fluorides
Space group: 
Tetragonal - Dipyramidal H-M Symbol (4/m) Space Group: P 4/n
Dana class: 
9.3.6.1 (9) Anhydrous and Hydrated Halides (9.3) Dana Type (9.3.6) Dana Group
High temperature: 
This mineral is not stable at room temperature, probably at temperatures up 100C.
Geological context: 
Occurs only as hydroxyled phase AlF3.2H2O (Rosenbergite) cavities in highly silicified limestone (Italy) and volcanic fumaroles (Antarctica).

Dernière mise à jour le 25.01.2021

THERMODYNAMICS

Individual properties (298.15 K)
M
g·mol-1
 V°
cm3·mol-1
 ΔGºf
J·mol-1
 ΔHºf
J·mol-1
 Sº
J·mol-1·k-1
 CP
J·mol-1·K-1
83.977 27.090 (Ref.: 95rob/hem) Robie R.A., and Hemingway B.S., 1995. Thermodynamic properties of minerals and related substances at 298.15 K and 1 Bar (105 Pascals) pressure and at higher temperatures. U.S. Geol. Survey Bull., 2131, 461 pp. -1431096 (Ref.: Internal calculation) -1510400 (Ref.: 89cox/wag) Cox J.D., Wagman D.D., and Medvedev V.A., 1989. CODATA Key Values for Thermodynamics. Hemisphere Publishing Corp., New York, 279 p. 66.500 (Ref.: 89cox/wag) Cox J.D., Wagman D.D., and Medvedev V.A., 1989. CODATA Key Values for Thermodynamics. Hemisphere Publishing Corp., New York, 279 p. 75.12 (Ref.: 89cox/wag) Cox J.D., Wagman D.D., and Medvedev V.A., 1989. CODATA Key Values for Thermodynamics. Hemisphere Publishing Corp., New York, 279 p.
CP(T) = a + b·T + ·c·T-2 (T in Kelvin)
a
J·mol-1·K-1
 b * 103
J·mol-1·K-2
 c * 10-5
J·K·mol-1
 Maier Kelley Ref.
86.89 25.32 -17.17 (Ref.: 89cox/wag) Cox J.D., Wagman D.D., and Medvedev V.A., 1989. CODATA Key Values for Thermodynamics. Hemisphere Publishing Corp., New York, 279 p.
Reaction properties

AlF3 ⇌ Al+3 + 3F-

298.15 K, 1 bar log10K: -17.32 ΔH°r:-34050 J·mol-1 (Ref.: 89cox/wag) Cox J.D., Wagman D.D., and Medvedev V.A., 1989. CODATA Key Values for Thermodynamics. Hemisphere Publishing Corp., New York, 279 p.
T(°C) 0 25 60 100 150 200 250 300
log10K -16.90 -17.32 -18.10 -19.11 -20.52 -22.13 -24.03 -26.44
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-2536.367386 -0.411690 138455.096647 916.897200 -8124336.149240