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Synthesis of Nano-Structured La0.8Ba0.2MnO3 Perovskite via a Mechano-Thermal Route
Zoya Sadighi,Abolghasem Ataie,Mohammad Reza Barati 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.1
In this study, barium-doped lanthanum manganite, La0.8Ba0.2MnO3, was synthesized via a mechano-thermalroute employing high energy ball milling and subsequent heat treatment. The structural evolution, morphol-ogy and thermal behaviour of the powders were evaluated using XRD, FESEM, and DTA/TGA, respectively. DTA/TGA results showed that the calcination temperature of the carbonates significantly decreased byincreasing the milling time. The results revealed that single phase perovskite was formed at 900 °C in amilled sample for 2 h and this temperature decreased to 600 °C by increasing the milling time to 30 h. Themean crystallite size also decreased from 32 to 20 nm by increasing the milling time from 2 to 30 h. Thereaction sequence of La0.8Ba0.2MnO3 formation via the mechano-thermal route is proposed using XRD andDTA/TGA results. FESEM micrographs showed that the mean particle size of the perovskite phase isincreased slightly from 30 to 40 nm by increasing the heat treatment temperature from 600 to 900 °C.