Abstract
A novel combustion technique has been developed to synthesize La0.92Mg0.18Fe0.90O3 or LMF ceramics. The NH2CH2COOH was used as the fuel to accelerate the chemical reaction of raw materials. Thermogravimetric TG and differential thermal analysis DTA were used to estimate the calcination temperature in the range from 800 to 1000°C. The pure perovskite phase was obtained for the samples calcined at 900°C for 2 h. This calcination temperature was selected for the pellets sintered between 1000°C and 1200°C for 2 h. The effect of calcination and sintering temperatures on the phase and morphology evolution of perovskite LMF was investigated. The XRD patterns indicated that LMF exhibited orthorhombic perovskite structure. With increasing the firing temperatures, the lattice parameters and the unit cell volume changed only slightly; the average particle size and the average grain size tended to increase from 133 to 227 nm and 0.40 to 0.92 μm, respectively. The density of sintered ceramics changed between 3.19 and 3.37 g/cm3 depending on the sintering temperature.
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