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A series of polycrystalline ceramic samples of La0.7Ca0.25X0.05MnO3 (X = Sr, Pb, and Ba) were prepared using sol-gel method with methanol as the solvent. Resistivity-temperature curves show sharp metal-insulator transitions; furthermore, magnetization-temperature curves reveal a transition from ferromagnetism to paramagnetism. After doping with Sr, Pb, and Ba, both average ionic radius of A site and...
In this work, La0.67Ca0.23K0.1MnO3:Agx (x = 0.1, 0.2, 0.3, 0.4, 0.5) polycrystalline ceramic samples were prepared by sol-gel method, and their structural and electrical properties were systematically investigated. X-ray diffraction (XRD) analysis showed that crystal structures of all samples were rhombohedral. Surface morphology was investigated by scanning electron microscopy (SEM), which indicated...
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