Microstructure and magnetic properties of novel high-entropy perovskite ceramics (Gd 0.2 La 0.2 Nd 0.2 Sm 0.2 Y 0.2 )MnO 3

Rare-earth transition element high-entropy perovskite ceramics (HEPCs) (Gd0.2La0.2Nd0.2Sm0.2Y0.2)MnO3 (GLNSYMnO3) were prepared by using a solid-state reaction method, and the structure, morphology and magnetic properties of the GLNSYMnO3 were studied. The crystalline structure of GLNSYMnO3 is a smooth surface and similar to "cashews" tubular particles, and a single-phase orthorhombic (Pbnm Space group) perovskite without impurities is confirmed when the sintered temperature reaches or exceeds 1250 degrees C by the analysis of phase composition and microstructures. Magnetic measurements indicate that GLNSYMnO3 HEPCs have low Curie temperature (TC = 61 K), but they exhibit a good magnetism by comparison with other high-entropy ceramics, which is caused by the lattice distortion and exchange interactions between high concentrations of Mn3+ (92.4 %) and non-magnetic oxygen ions, promoting the movement of circulating electrons. GLNSYMnO3 HEPCs did not undergo a phase transition below TC due to high configurational entropy driving structural stability. In addition, GLNSYMnO3 HEPCs undergo a second-order magnetic phase transition from isothermal magnetization curves and Arrot curves, which have potential applications in magnetic storage.