KatoiteSi1

Formula : Ca3Al2(SiO4)1(OH)8

Family: 
Garnet
Space group: 
Isometric - Hexoctahedral HM symbol (4/m -3 2/m) Space Group: I a3d
Dana class: 
51.4.3d.2VIII- 51 Nesosilicate Minerals ; 51.4 Nesosilicates Nesosilicate Insular SiO4 Groups Only with cations in [6] and >[6] coordination ; 51.4.3d Garnet group (Hydrogarnet)
High temperature: 
Described with the cement phases the stability of Katoite at low temperature cannot be dismissed.
Geological context: 
Katoite is an hydrogarnet.

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
402.339 141.510 (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. -5433894 (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. -5907896 (Ref.: Internal calculation) 364.000 (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. 415.07 (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.
415.07 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

KatoiteSi1 + 12H+ ⇌ 2Al+3 + 3Ca+2 + H4SiO4 + 8H2O

298.15 K, 1 bar log10K: 71.17 ΔH°r:-543405 J·mol-1 (Ref.: Internal calculation)
T(°C) 0 25 60 100 150 200 250 300
log10K 79.85 71.17 61.16 52.03 43.02 35.76 29.60 24.04
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-2144.520441 -0.324976 142632.050995 770.644190 -6464228.633697