A Comparative Study on Structure Lao.7Sro.2Bao.iMn03 Prepared by Sol-Gel and Wet-Mixing Methods

摘要

Nanocrystalline La_(0.7)Sr_(0.2)Ba_(0.1)MnO3(LSBMO)has been synthesized using two difference method, sol-gel and wet-mixing methods.Both samples were sintered at the same temperature of 900°C for 12 hours.Structural investigation using X-Ray Diffraction(XRD)shows that both samples crystallise in the same rhombohedral structure with R3c(167)space group.A slight difference on lattice parameters, unit cell volume and Mn-O bond length was observed.The crystallinity from the sol-gel method was better than that of from wet-mixing method.The average crystallite size was calculated by Scherer formula, namely 32.8568 nm for sol-gel method and 18.3777 nm for wet-mixing method.The electronic bandwidth which was calculated with theoretical approach reveal that the sol-gel method gives larger bandwidth than the wet-mixing method, which can affect the physical properties of the LSBMO.