Monteponite

Formula : CdO

Family: 
Oxides
Space group: 
Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F m3m
Dana class: 
4.2.1.4 (4) Simple Oxides (4.2) with a cation charge of 2+ (A++ O) (4.2.1) Periclase group (Isometric, Fm3m)
High temperature: 
Stable at room temperature
Geological context: 
Coating on calamine [ZnOH)2SiO3] crystals, in oxidation zone of zinc-bearing deposits, from sphalerite [(Fe,Zn)S] weathering.

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
128.409 15.590 (Ref.: 95rob/hem) Robie R.A., and Hemingway B.S., 1995. Thermodynamic properties of minerals and related substances at 298.15 K and 1 Bar (105 Pascals) pressure and at higher temperatures. U.S. Geol. Survey Bull., 2131, 461 pp. -228661 (Ref.: Internal calculation) -258350 (Ref.: 89cox/wag) Cox J.D., Wagman D.D., and Medvedev V.A., 1989. CODATA Key Values for Thermodynamics. Hemisphere Publishing Corp., New York, 279 p. 54.800 (Ref.: 89cox/wag) Cox J.D., Wagman D.D., and Medvedev V.A., 1989. CODATA Key Values for Thermodynamics. Hemisphere Publishing Corp., New York, 279 p. 43.65 (Ref.: 77bar/kna) Barin I., Knacke O., and Kubaschewski I., 1977: Thermochemical properties of inorganic substances. Springer Verlag, Berlin.
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.
47.26 6.36 -4.90 (Ref.: 77bar/kna) Barin I., Knacke O., and Kubaschewski I., 1977: Thermochemical properties of inorganic substances. Springer Verlag, Berlin.
Reaction properties

Monteponite + 2H+ ⇌ Cd+2 + H2O

298.15 K, 1 bar log10K: 15.10 ΔH°r:-103400 J·mol-1 (Ref.: 89cox/wag) Cox J.D., Wagman D.D., and Medvedev V.A., 1989. CODATA Key Values for Thermodynamics. Hemisphere Publishing Corp., New York, 279 p.
T(°C) 0 25 60 100 150 200 250 300
log10K 16.77 15.10 13.21 11.49 9.81 8.47 7.36 6.37
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-311.061277 -0.047318 21589.627023 112.222636 -873465.790748