Jaffeite

Formula : Ca6(Si2O7)(OH)6

Space group: 
Trigonal - Rhombohedral or Pyramidal HM symbol (3 or -3) Space Group: P 3
Dana class: 
55.3.2.1VIII- 55 Sorosilicates Sorosilicate Si2O7 Groups, Generally with No Additional Anions ; 55.3 Sorosilicates Sorosilicate Si2O7 Groups, Generally with No Additional Anions with cations in [7] coordination ; 55.2.3

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
510.679 174.376 (Ref.: 95ant/bid) Anthony J.W., Bideaux R.A., Bladh K.W. and Nichols M.C., 1995. Handbook of Mineralogy, Volume II. Silica, Silicates. Mineral Data Publishing, Tucson, 904 pp., 2 vols. -6469940 (Ref.: 10abla/bou) Blanc, Ph.; Bourbon, X.; Lassin, A.; Gaucher, E.C. 2010 - Chemical model for cement-based materials: Temperature dependence of thermodynamic functions for nanocrystalline and crystalline C-S-H phases. Cement and Concrete Research, 40, p. 851-867 -6972771 (Ref.: 10abla/bou) Blanc, Ph.; Bourbon, X.; Lassin, A.; Gaucher, E.C. 2010 - Chemical model for cement-based materials: Temperature dependence of thermodynamic functions for nanocrystalline and crystalline C-S-H phases. Cement and Concrete Research, 40, p. 851-867 326.184 (Ref.: Internal calculation) 344.90 (Ref.: 10abla/bou) Blanc, Ph.; Bourbon, X.; Lassin, A.; Gaucher, E.C. 2010 - Chemical model for cement-based materials: Temperature dependence of thermodynamic functions for nanocrystalline and crystalline C-S-H phases. Cement and Concrete Research, 40, p. 851-867
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.
344.90 0.00 0.00 (Ref.: 10abla/bou) Blanc, Ph.; Bourbon, X.; Lassin, A.; Gaucher, E.C. 2010 - Chemical model for cement-based materials: Temperature dependence of thermodynamic functions for nanocrystalline and crystalline C-S-H phases. Cement and Concrete Research, 40, p. 851-867
Reaction properties

Jaffeite + 12H+ ⇌ 6Ca+2 + 2H4SiO4 + 5H2O

298.15 K, 1 bar log10K: 114.07 ΔH°r:-632100 J·mol-1 (Ref.: 10abla/bou) Blanc, Ph.; Bourbon, X.; Lassin, A.; Gaucher, E.C. 2010 - Chemical model for cement-based materials: Temperature dependence of thermodynamic functions for nanocrystalline and crystalline C-S-H phases. Cement and Concrete Research, 40, p. 851-867
T(°C) 0 25 60 100 150 200 250 300
log10K 124.18 114.07 102.47 91.98 81.77 73.73 67.10 61.26
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-2400.890425 -0.341322 166813.549183 866.597076 -7742925.811718