Ettringite(Fe)

Formula : Ca6Fe2(SO4)3(OH)12:26H2O

Family: 
Sulfates
Space group: 
Hexagonal - Dihexagonal Dipyramidal HM symbol (6/m 2/m 2/m) Space Group: P 63/mmc
Dana class: 
31.10.2.13 2/m ; 31.10 Hydrated Sulfates Containing Hydroxyl or Halogen miscellaneous ; 31.10.2
High temperature: 
Iron analog to ettringite
Geological context: 
see ettringite

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
1312.840 711.800 (Ref.: 98gla/tyr) Glasser, F. P., Tyrer, M., Quillin, K., Ross, D., Pedersen, J., Goldthorpe, K., Bennett, D., and Atkins, M., 1998, The chemistry of blended cements and backfills intended for use in radioactive waste disposal: Research and development Technical Report P98, UK Environment Agency, 332 p. -14281369 (Ref.: 10bbla/bou) Blanc, Ph.; Bourbon, X.; Lassin, A.; Gaucher, E.C. 2010 - Chemical model for cement-based materials: Thermodynamic data assessment for phases other than C-S-H. Cement and Concrete Research, 40, p. 1360-1374. -16601212 (Ref.: Internal calculation) 1930.110 (Ref.: 10bbla/bou) Blanc, Ph.; Bourbon, X.; Lassin, A.; Gaucher, E.C. 2010 - Chemical model for cement-based materials: Thermodynamic data assessment for phases other than C-S-H. Cement and Concrete Research, 40, p. 1360-1374. 2214.54 (Ref.: 10bbla/bou) Blanc, Ph.; Bourbon, X.; Lassin, A.; Gaucher, E.C. 2010 - Chemical model for cement-based materials: Thermodynamic data assessment for phases other than C-S-H. Cement and Concrete Research, 40, p. 1360-1374.
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.
2214.54 0.00 0.00 (Ref.: 10bbla/bou) Blanc, Ph.; Bourbon, X.; Lassin, A.; Gaucher, E.C. 2010 - Chemical model for cement-based materials: Thermodynamic data assessment for phases other than C-S-H. Cement and Concrete Research, 40, p. 1360-1374.
Reaction properties

Ettringite(Fe) + 12H+ ⇌ 6Ca+2 + 2Fe+3 + 3SO4-2 + 38H2O

298.15 K, 1 bar log10K: 54.59 ΔH°r:-344348 J·mol-1 (Ref.: Internal calculation)
T(°C) 0 25 60 100 150 200 250 300
log10K 59.99 54.59 48.15 42.09 35.78 30.19 24.68 18.44
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-6614.872663 -1.024541 375732.379722 2402.740657 -20508554.052179