ChemInform Abstract: La_0.7Ca_0.3MnO₃ Perovskite Synthesized by Reactive Milling Method: The Effect of Particle Size on the Magnetic and Electrical Properties.

Abstract

. -Nanocrystalline samples of the title compound are prepared by reactive milling of mixtures of La2O3, CaCO3, and MnO2, followed by annealing at 700-1000°C in air for 5 h. They are characterized by XRD, FESEM, electrical resistivity, and magnetic measurements. The average crystallite size increases from 16 to 73 nm with increasing annealing temperature. While the ferromagnetic-paramagnetic transition temperature does not show significant change, the metal-insulator transition temperature is markedly affected by the particle size. -(MANH*, D. H.; PHONG, P. T.; THANH, T. D.; HONG, L. V.; PHUC, N. X.; J.