Berlinite

Formula : AlPO4

Family: 
Phosphates
Space group: 
Trigonal - Trapezohedral HM symbol (3 2) Space Group: P 3121,P 3221
Dana class: 
38.4.2.1VII - 38 Anhydrous Phosphates, etc ; 38.4 Anhydrous Phosphates, etc A+ XO4 ; 38.4.2
High temperature: 
A rare high-temperature hydrothermal or metasomatic mineral
Geological context: 
A rare high-temperature hydrothermal or metasomatic mineral

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
121.953 46.580 (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. -1617900 (Ref.: 82wag/eva) Wagman D.D., Evans W.H., Parker V.B., Schumm R.H., Halow I., Bailey S.M., Churney K.L., and Nutall R.L., 1982. The NBS Tables of Chemical Thermodynamic Properties. J. Phys. Chem. Ref. Data, 11, Suppl. 2. -1733849 (Ref.: Internal calculation) 90.800 (Ref.: 68wag/eva) Wagman D.D., Evans W.H., Parker V.B., Halow I., Bailey S.M., Schumm R.H., 1968. Selected values of chemical thermodynamic properties. Natl. Bur. Stand. Tech. Note, 270-3, 264 p. 93.18 (Ref.: 74nau/ryz, 76wag/eva, 71par/wag)
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.
93.18 0.00 0.00 (Ref.: 74nau/ryz, 76wag/eva, 71par/wag)
Reaction properties

Berlinite + 2H+ ⇌ Al+3 + H2PO4-

298.15 K, 1 bar log10K: 1.21 ΔH°r:-107151 J·mol-1 (Ref.: Internal calculation)
T(°C) 0 25 60 100 150 200 250 300
log10K 2.87 1.21 -0.84 -2.85 -5.03 -6.99 -8.86 -10.79
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-1057.373601 -0.174848 61600.673480 380.465647 -3318833.442349