Abstract: We synthesized manganese-based perovskite La_1-x-yCa_xK_yMnO₃ (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.

Key words: manganese-based perovskite,  , anion regulation,  , bond length,  , magnetic change