Abstract
La0.67Ca0.33Mn1−x Ni x O3 (0 ≤x ≤ 0.3) is synthesized by solid-state reaction at low temperatures, followed by calcination in air. The precursor and its calcined products are characterized by thermogravimetry and differential scanning calorimetry, x-ray powder diffraction, scanning electron microscopy, and vibrating sample magnetometer. A high-crystallized La0.67Ca0.33Mn1−x Ni x O3 with an orthorhombic structure is obtained when the precursor is calcined at 900∘C in air for 3 h. Crystallite size of La0.67Ca0.33Mn1−x Ni x O3 increases with the increase of Ni content, attributed to the decrease of lattice strains of the La0.67Ca0.33Mn1−x Ni x O3 with the increase in Ni content. Nickel substitution can markedly improve coercivity and specific magnetization of La0.67Ca0.33Mn1−x Ni x O3. The coercive field (9 Oe) of La0.67Ca0.33Mn0.7Ni0.3O3 is higher, even at 293 K, indicating that La0.67Ca0.33Mn0.7Ni0.3O3 continues being ferromagnetic above 260 K (Curie temperature for LCMO).
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