Effect of Ca-Doping on the Structure and Morphology of Polycrystalline La0.7(Ba1-xCax)0.3MnO3 (x = 0; 0.03; and 0.05)

Abstract

In this paper, we report structure and morphology of polycrystalline La0.7(Ba1-xCax)0.3MnO3 (x = 0; 0.03; 0.05). Basically, these materials are perovskite manganites type with the general structure AMnO3 (A= trivalent rare earth with divalent ion-doped) which have been extensively studied due to their interesting physical properties. It was known that the electron transport in this material influenced by ion doped at A site. Doping with different divalent ions should cause the lattice distortion. Hence, double exchange interaction is enhanced. In this study, we prepared our sample through the sol-gel method. It is show that the method has resulted in powder materials with ultra-fine particle size. The effect of Ca+2 and Ba+2 doping on the structure did not make any phase changing, but the lattice parameter of La0.7(Ba1-xCax)0.3MnO3 decreased below × = 0.03. Microstructure observed by scanning electron microscope to the sintered samples indicated that the microstructure is homogeneous with fine size of equiaxed grain morphology. Microanalysis by EDS confirmed there is no significant different between designated composition and measured one. It is concluded that effect of Ca+2 and Ba+2 doped in LaMnO3 has resulted in microstructural and lattice parameter changes. The doped materials are remaining single phase.