Synthesis and Characterization of Lamn1-XFexO3 (X=0, 0.1, 0.2) by Coprecipitation Route

N. Geetha, Senthil Kumar, D. Prakash
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引用次数: 10

Abstract

Perovskite type oxides are fascinating nanomaterials and its physical properties of interest to materials science through perovskites include superconductivity, magnetoresistance, ionic conductivity, and a multitude of dielectric properties, which are of great importance in microelectronics and telecommunication. Recently interest has arisen in perovskite-type oxides as catalysts due to high thermal and hydrothermal stability as well as high mechanical strength among other properties. In the present work, LaMn1-xFexO3 perovskite was synthesized by the co-precipitation method. The product was characterized by X-ray diffractometer (XRD), Scanning electron microscope (SEM), Energy dispersive X-ray spectrometer (EDX), Fourier transform infrared spectroscopy (FTIR), UV-visible absorption spectroscopy and conductivity study. The XRD pattern confirmed the formation of perovskite phase. The SEM micrographs indicated that the morphology contain porosity due to inter-particle voids. The presence of functional groups of the pure and doped lanthanum manganite were studied by FTIR. The optical band gap decreases with increasing the content of iron in the sample. The conductivity study confirmed that the conductivity increases with increasing the content of iron.
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共沉淀法合成Lamn1-XFexO3 (X= 0,0.1, 0.2)及表征
钙钛矿型氧化物是一种令人着迷的纳米材料,它的物理性质引起了材料科学的兴趣,包括超导性、磁电阻、离子电导率和多种介电性质,这在微电子和电信领域具有重要意义。近年来,由于钙钛矿型氧化物具有较高的热稳定性和水热稳定性以及高机械强度等特性,人们对钙钛矿型氧化物作为催化剂产生了兴趣。本文采用共沉淀法合成了LaMn1-xFexO3钙钛矿。采用x射线衍射仪(XRD)、扫描电镜(SEM)、x射线能谱仪(EDX)、傅里叶变换红外光谱(FTIR)、紫外可见吸收光谱和电导率研究对产物进行了表征。XRD谱图证实了钙钛矿相的形成。SEM显微图表明,由于颗粒间的空隙,形貌中含有孔隙。用红外光谱研究了纯锰酸镧和掺杂锰酸镧的官能团的存在。光学带隙随样品中铁含量的增加而减小。电导率研究证实,电导率随铁含量的增加而增加。
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