The paramagnetic properties of LaCoO3 are investigated theoretically. LaCoO3 belongs to those perovskites which enjoy because of their catalytic qualities as exhaust catalyst increasing interest. The theoretical temperature dependence of the susceptibility is given and compared with experimental results. Good agreement between theory and experiment is achieved under the condition that only every second Co ion is excitable into the magnetic quintet state. The energy gap between low spin CoIII and high spin Co3+ is determined and compared with the gap resulting from the optical data.
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R. Marx (1980) studied this question.
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