Low-temperature heat capacities and thermodynamic properties of zinc ferrites--II : Effect of thermal history and metallic additives

The heat capacities of annealed and quenched samples of Li0.005Zn0.90Fe2.05O4, and of quenched ZnFe2O4 have been determined over the range 5-350[delta]K. Addition of lithium to zinc ferrite lowers the temperature of the co-operative thermal anomaly associated with antiferromagnetic ordering transition in accord with theory, and quenching of either material results in nearly complete disappearance of the [lambda]-anomaly but modifies the pronounced high-temperature tail less significantly. The effects on the thermal properties are interpreted in terms of sublattice populations.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/32485/1/0000571.pd