Ca2Mn3O8 and Cd2Mn3O8, which contain Mn4+ monolayers, have been prepared and characterized. Their magnetic susceptibility (χ) and electron paramagnetic resonance (EPR) behavior have been examined in detail. The Mn4+ moments in both Ca2Mn3O8 and Cd2Mn3O8 order antiferromagnetically near 60 and 10 K, respectively. Although the Néel temperature in Ca2Mn3O8 is in reasonable agreement with molecular-field theory, that in Cd2Mn3O8 is well below its expected value. Intralayer exchange integrals have been estimated from the magnetic data and increase in the following manner: Ca2MnO4≫CaMnO3≳Ca2Mn3O8≫Cd2Mn3O8. It is proposed that these results, as well as those in the calcium manganite series CaMnO3→Ca2MnO4, may reflect the chemical influence of the divalent cation in modifying the Mn-O covalent mixing.
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White et al. (1979) studied this question.
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