Abstract
Polycrystalline lanthanum orthoferrites were prepared by firing coprecipitated hydroxides of La 3+ and Fe 3+ at elevated temperatures. The materials fired at temperatures below 1100°C were characterized by the coexistence of such lattice vacancies that the concentration ratio of V La: V Fe: V o is always equal to that of the constituent atoms of LaFeO 3. They exhibited a large magnetic susceptibility, a low Néel temperature, and a small spontaneous magnetization, in comparison with lanthanum orthoferrite without these vacancies. These characteristics originated essentially from a local reduction in anisotropic superexchange interaction at vacant sites. The lowering of Néel temperature characteristic of these materials was interpreted in terms of a decrease in the number of Fe 3+OFe 3+ linkages due to the existence of oxygen and iron vacancies.
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