کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1461185 | 989616 | 2014 | 8 صفحه PDF | دانلود رایگان |
Strontium and magnesium doped lanthanum gallate (La0.9Sr0.1Ga0.8Mg0.2O3−δ), known as LSGM, was first prepared via ethylene glycol method. This route of preparation showed improved electrical conductivity, better surface area and high density. X-ray diffraction patterns of LSGM sintered at different temperatures indicated that pure LSGM phase was formed after sintering at 1400 °C. X-ray Rietveld refinement confirmed the formation of pure perovskite orthorhombic phase of the LSGM. The sintered sample showed 99% relative density. Scanning electron microscopic study of LSGM also depicted fairly densed grain morphology. X-ray photoelectron spectroscopy measurement confirmed the stability of the sintered sample in air and the existence of constituent elements in their characteristic valence states. A surface without porosity was observed in BET measurement. Average thermal expansion coefficient was found to be 9.78×10−6/°C in the measured temperature range (RT–1000 °C). The frequency dependent electrical conductivity of the sample was measured in the temperature range 400–800 °C. Total electrical conductivity of the LSGM pellet was found to be 0.056 S cm−1 at 800 °C.
Journal: Ceramics International - Volume 40, Issue 5, June 2014, Pages 7177–7184