X-ray single phase LSGM at 1350 °C

Öncel, Çınar and Özkaya, Berkem and Gülgün, Mehmet Ali (2007) X-ray single phase LSGM at 1350 °C. Journal of the European Ceramic Society, 27 (2-3). pp. 599-604. ISSN 0955-2219

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Synthesis of X-ray-phase-pure (La1−xSrxGa1−yMgyO3−δ, LSGM, where x = 0.1, y = 0.15 and 0.17) powders were achieved at temperatures as low as 1350 °C via organic precursor method using tartaric acid as the carrier material. LSGM materials were characterized for their phase purity, crystallization and electrical properties. Pellets sintered at 1350 °C for 6 h were single phase and dense (>99%). Electron microscopy analysis of X-ray single-phase pellets revealed MgO precipitates with sizes ranging from 50–300 nm. Phase formation and distribution in this complicated multi-cation-oxide system as a function of temperature were reported and discussed. Amorphous LSGM first crystallizes at 625 °C. However, elimination of undesired phases require higher temperatures. Impedance measurements as a function of temperature up to 545 °C revealed that the X-ray phase pure pellets may have extrapolated ionic conductivity values as high as 0.14–0.16 S/cm at 800 °C. Possible implications of limited MgO solubility on the ionic conductivity are presented.
Item Type: Article
Uncontrolled Keywords: LSGM; ionic conductivity; solubility; MgO; crystallization
Subjects: T Technology > TP Chemical technology
Q Science > QD Chemistry
Divisions: Faculty of Engineering and Natural Sciences
Depositing User: Mehmet Ali Gülgün
Date Deposited: 19 Dec 2006 02:00
Last Modified: 25 May 2011 14:06
URI: https://research.sabanciuniv.edu/id/eprint/622

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