Abstract
La0.7Ca0.3MnO3 compounds with the crystallite size of D = 45-200 nm were synthesized by utilizing the solid-state reaction and mechanical ball milling methods. The reduction of the crystallite size (D) resulted in the decrease of both TC and magnetization, broadening of the phase transition region, and appearance of Griffiths phase features in the materials. The temperature dependence of saturation magnetization (MS), the variations of the coercivity (HC), and the deviation of magnetization from expected Bloch’s law T3/2 for these samples were also investigated. Based on the core-shell model, the core diameter and the nonmagnetic shell thickness for the samples were determined.
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