Florencite

Formula : CeAl3(PO4)2(OH)6

Family: 
Phosphates
Space group: 
Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

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
513.051 137.510 (Ref.: 93sch/got) Schwab R. G., Gotz C., Herold H., and Oliveira N. P. (1993) Compounds of the crandallite type-Thermodynamic properties of Caphosphates, Sr-phosphates, Ba-phosphates, Pb-phosphates, La-phosphates, Ce-phosphates to Gd-phosphates and Ca-arsenates, Ba-arsenates, Pb-arsenates, La-arsenates, Ce-arsenate.Srarsenates, Neues Jahrb Miner Monatsh. 12, 551-568. -5741600 (Ref.: 93sch/got) Schwab R. G., Gotz C., Herold H., and Oliveira N. P. (1993) Compounds of the crandallite type-Thermodynamic properties of Caphosphates, Sr-phosphates, Ba-phosphates, Pb-phosphates, La-phosphates, Ce-phosphates to Gd-phosphates and Ca-arsenates, Ba-arsenates, Pb-arsenates, La-arsenates, Ce-arsenate.Srarsenates, Neues Jahrb Miner Monatsh. 12, 551-568. -6247034 (Ref.: Internal calculation) 369.400 (Ref.: 93sch/got) Schwab R. G., Gotz C., Herold H., and Oliveira N. P. (1993) Compounds of the crandallite type-Thermodynamic properties of Caphosphates, Sr-phosphates, Ba-phosphates, Pb-phosphates, La-phosphates, Ce-phosphates to Gd-phosphates and Ca-arsenates, Ba-arsenates, Pb-arsenates, La-arsenates, Ce-arsenate.Srarsenates, Neues Jahrb Miner Monatsh. 12, 551-568. 102.52 (Ref.: 93sch/got) Schwab R. G., Gotz C., Herold H., and Oliveira N. P. (1993) Compounds of the crandallite type-Thermodynamic properties of Caphosphates, Sr-phosphates, Ba-phosphates, Pb-phosphates, La-phosphates, Ce-phosphates to Gd-phosphates and Ca-arsenates, Ba-arsenates, Pb-arsenates, La-arsenates, Ce-arsenate.Srarsenates, Neues Jahrb Miner Monatsh. 12, 551-568.
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.
111.96 64.00 -25.35 (Ref.: 93sch/got) Schwab R. G., Gotz C., Herold H., and Oliveira N. P. (1993) Compounds of the crandallite type-Thermodynamic properties of Caphosphates, Sr-phosphates, Ba-phosphates, Pb-phosphates, La-phosphates, Ce-phosphates to Gd-phosphates and Ca-arsenates, Ba-arsenates, Pb-arsenates, La-arsenates, Ce-arsenate.Srarsenates, Neues Jahrb Miner Monatsh. 12, 551-568.
Reaction properties

Florencite + 10H+ ⇌ 3Al+3 + Ce+3 + 2H2PO4- + 6H2O

298.15 K, 1 bar log10K: 16.58 ΔH°r:-387869 J·mol-1 (Ref.: Internal calculation)
T(°C) 0 25 60 100 150 200 250 300
log10K 22.73 16.58 9.37 2.66 -4.20 -10.04 -15.37 -20.68
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-3276.427326 -0.516379 192209.319249 1176.842789 -9754179.086897