Tobermorite(11A)

Formula : Ca5Si6H11O22.5

Space group: 
Orthorhombic - Disphenoidal H-M Symbol (2 2 2) Space Group: C 2221
Dana class: 
72.3.2.1 (72) Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings (72.3) with 3-, 4-, or 5- membered rings and 8-membered rings (72.3.2) Tobermorite group (5- 8-membered rings)
High temperature: 
Described with the cement phases the stability of Tobermorite at low temperature cannot be dismissed.
Geological context: 
Known as a hydrothermal alteration product of calcium carbonate rocks, due to contact metamorphism and metasomatism. Filling vesicles and cavities in basaltic rocks.

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
739.977 286.190 (Ref.: 00mer/bon) Merlino, S., Bonaccorsi, E., and Armbruster, T., 2000, The real structure of clinotobermorite and tobermorite 9 A: OD character, polytypes, and structural relationships: European Journal of Mineralogy, v. 12, p. 411-429. -9889529 (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 -10680920 (Ref.: 00zue/feh) Zuern, S.G., and Fehr, K.T., 2000. Phase relations and thermodynamic properties of 1.13 nm tobermorite and xonotlite. In: Sixth International Symposium on Hydrothermal reactions/Fourth International Conference on Solvo-thermal Reactions, Kochi, Japan, pp. 286-289. 693.171 (Ref.: Internal calculation) 764.91 (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.
764.91 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

Tobermorite(11A) + 10H+ + 1.5H2O ⇌ 5Ca+2 + 6H4SiO4

298.15 K, 1 bar log10K: 65.58 ΔH°r:-358501 J·mol-1 (Ref.: 00zue/feh) Zuern, S.G., and Fehr, K.T., 2000. Phase relations and thermodynamic properties of 1.13 nm tobermorite and xonotlite. In: Sixth International Symposium on Hydrothermal reactions/Fourth International Conference on Solvo-thermal Reactions, Kochi, Japan, pp. 286-289.
T(°C) 0 25 60 100 150 200 250 300
log10K 71.12 65.58 58.86 52.68 46.65 41.90 37.96 34.37
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-3473.200962 -0.455889 227492.111432 1237.165314 -13297952.178894