Abstract
The superexchange interaction energy for an -- linkage is considered for seven oxides in which is the only magnetic ion present, and for magnetite. The superexchange energy may be estimated from the value of , where is the Curie temperature and is the number of -- inter-actions per ion per formula unit. The average value of is 115° (range 106 to 132°). The only compounds considered are antiferromagnetic oxides in which ions are present in one set of crystallo-graphically equivalent positions and ferrimagnetic oxides in which ions are present in two different sets of crystallographically equivalent positions. No distinct correlation of superexchange energy with - distances or with the included angle in the linkages is evident. Superexchange coupling is considered only for contact distances and for included angles substantially greater than 90°.
- Received 11 September 1957
DOI:https://doi.org/10.1103/PhysRev.109.777
©1958 American Physical Society