Zincite

Formula : ZnO

Family: 
Oxides
Space group: 
Hexagonal - Dihexagonal Pyramidal H-M Symbol (6mm) Space Group: P 63mc
Dana class: 
4.2.2.1 (4) Simple Oxides (4.2) with a cation charge of 2+ (A++ O) (4.2.2) Dana Group
High temperature: 
Stable at room temperature, zincite is also stable at high temperature.
Geological context: 
Metamorphosed weathered ore deposit, but also produced as a byproduct of zinc ore smelting.

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
81.389 14.340 (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. -320480 (Ref.: Internal calculation) -350487 (Ref.: 13pow/bro) Powell, K.J., Brown, P.L., Byrne, R.H., Gajda, T., Hefter, G., Leuz, A.-K., Sjoberg, S., Wanner, H., 2013. Chemical speciation of environmentally significant metals with inorganic ligands. Part 5: The Zn2++ OH-, Cl-, CO32-, SO42-, and PO43-systems (IUPAC Technical Report). Pure and Applied Chemistry 85, 2249-2311. 43.650 (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. 40.42 (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.
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.
46.57 6.01 -7.05 (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.
Reaction properties

Zincite + 2H+ ⇌ Zn+2 + H2O

298.15 K, 1 bar log10K: 11.19 ΔH°r:-88728 J·mol-1 (Ref.: 13pow/bro) Powell, K.J., Brown, P.L., Byrne, R.H., Gajda, T., Hefter, G., Leuz, A.-K., Sjoberg, S., Wanner, H., 2013. Chemical speciation of environmentally significant metals with inorganic ligands. Part 5: The Zn2++ OH-, Cl-, CO32-, SO42-, and PO43-systems (IUPAC Technical Report). Pure and Applied Chemistry 85, 2249-2311.
T(°C) 0 25 60 100 150 200 250 300
log10K 12.62 11.19 9.57 8.10 6.66 5.51 4.54 3.66
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-346.332765 -0.052310 22726.462504 124.473889 -987169.553114