A Caltech Library Service

Heat of Formation of O2–

Gaffney, Edward S. and Ahrens, Thomas J. (1969) Heat of Formation of O2–. Journal of Chemical Physics, 51 (3). pp. 1088-1091. ISSN 0021-9606. doi:10.1063/1.1672107.

See Usage Policy.


Use this Persistent URL to link to this item:


A series of Born–Mayer-type calculations are used to calculate the lattice energies of simple oxides (MgO, BeO, CaO, and ZnO). Repulsion and other non-Coulombic contributions to the lattice energy are obtained using thermodynamic and recent ultrasonic data for the bulk moduli and the isothermal pressure and temperature derivatives of the elastic constants. Using thermochemical data for the heat of formation of MgO, CaO, and BeO and their cations, the heat of formation of O2–, DeltaHf°(O2–), is calculated to be 197 ± 5 kcal/mole. Using the largest value of DeltaHf°(O2–), obtained for MgO, presumably the most ionic of the crystals treated, a value of 202.3 kcal/mole is obtained. These values are believed to be more accurate than earlier values given by Morris and by Huggins and Sakamoto who obtained 210 ± 6 and 221 ± 15 kcal/mole. The anomalously low value calculated for DeltaHf°(O2–) for ZnO is believed to result from a substantial covalent contribution in the Zn[Single Bond]O bond in this oxide.

Item Type:Article
Related URLs:
URLURL TypeDescription
Additional Information:©1969 American Institute of Physics (Received 20 February 1969) We have profited from discussion of these calculations with D. L. Anderson and W. B. Kamb. This research was in part supported by Defense Atomic Support Agency Contract DASA 01-68-C-0069. Contribution No. 1605, Division of Geology and Planetary Sciences. California Institute of Technology. Pasadena, Calif.
Funding AgencyGrant Number
Defense Atomic Support Agency (DASA)DASA 01-068-C-0069
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Geological and Planetary Sciences1605
Issue or Number:3
Record Number:CaltechAUTHORS:GAFjcp69
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4877
Deposited By: Archive Administrator
Deposited On:12 Sep 2006
Last Modified:08 Nov 2021 20:20

Repository Staff Only: item control page