Hydrotalcite(CO3)

Formula : Mg4Al2(OH)12(CO3):2H2O

Family: 
LDH
Space group: 
Trigonal - Hexagonal Scalenohedral HM symbol (-3 2/m) Space Group: R 3m
Dana class: 
16b.6.2.1V - 16b Carbonates - Hydroxyl or Halogen ; 16b.6 Carbonates - Hydroxyl or Halogen ; 16b.6.2 Sjorgrenite-Hydrotalcite Group (Hydrotalcite Subgroup:Rhombohedral)
High temperature: 
Stability ofHydrotalcite at low temperature cannot be dismissed.
Geological context: 
Found associated with serpentinite rocks. Cement phases

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
451.311 231.441 (Ref.: 97tay) Taylor H.F.W. , 1997 Cement Chemistry, 2nd. Ed., Thomas Telford, London. -6354321 (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. -7078880 (Ref.: Internal calculation) 552.070 (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. 604.15 (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.
604.15 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

Hydrotalcite(CO3) + 13H+ ⇌ 2Al+3 + HCO3- + 4Mg+2 + 14H2O

298.15 K, 1 bar log10K: 61.20 ΔH°r:-557470 J·mol-1 (Ref.: Internal calculation)
T(°C) 0 25 60 100 150 200 250 300
log10K 70.15 61.20 50.99 41.77 32.72 25.43 19.18 13.37
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-3020.963525 -0.458092 187277.712157 1086.384808 -8673680.207710