Anion-Controlled Mn-O Bond Length and Magnetic Properties in Manganese-Based Perovskites
We synthesized manganese-based perovskite La1-x-y CaxKyMnO3(LCKMO)by hydrothermal method and studied the effect of anion mole fraction on the Mn—O bond length duing its hydrothermal growth process,as well as its regulatory effect on magnetic properties.The research results show that all samples have a perovskite structure and exhibit superlattice reflection under K+doping.The surface of the prepared samples presents smooth single-crystal cubic morphology.The Mn—O bond length in perovskite is positively correlated with the anion mole fraction during the reaction growth process.The LCKMO samples with different Mn—O bond lengths all exhibit room-temperature ferromagnetism,but there are significant differences in their saturation magnetization and coercivity at the same temperature.The blocking temperature of the samples increases with the increase of Mn—O bond length.The research results provide experimental guidance for optimizing the magnetic properties of perovskite materials and deepen the understanding of the underlying physical processes.
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