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Issue 24, 2012
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Thermodynamic stability, structural and electrical characterization of mixed ionic and electronic conductor La2Mo2O8.96

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Abstract

Thermogravimetric analysis (TGA) technique in controlled oxygen partial pressure (pO2) atmospheres has been used to obtain equilibrium oxygen content data as a function of pO2 on the La2Mo2O9−δ system resulting from the partial reduction of fast oxide-ion conductor La2Mo2O9 (LM). Thermodynamic conditions for stabilization of crystalline La7Mo7O30 and amorphous La2Mo2O7−y at 718 °C have been determined and discussed. At 608 °C, the compound reported for the first time La2Mo2O8.96 (LM896) has been found. The crystalline form and transition temperature in LM896 have been identified by X-ray diffraction at room temperature (XRD) and at controlled temperature. Conductivity curves obtained by electrochemical impedance spectroscopy (EIS) as a function of temperature for both LM and LM896 have been compared. The results indicate that LM896 is a mixed ionic and electronic conductor (MIEC).

Graphical abstract: Thermodynamic stability, structural and electrical characterization of mixed ionic and electronic conductor La2Mo2O8.96

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Publication details

The article was received on 03 Feb 2012, accepted on 02 Apr 2012, published on 05 Apr 2012 and first published online on 05 Apr 2012


Article type: Paper
DOI: 10.1039/C2DT30261F
Citation: Dalton Trans., 2012,41, 7266-7271
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    Thermodynamic stability, structural and electrical characterization of mixed ionic and electronic conductor La2Mo2O8.96

    J. E. Vega-Castillo, U. K. Ravella, G. Corbel, P. Lacorre and A. Caneiro, Dalton Trans., 2012, 41, 7266
    DOI: 10.1039/C2DT30261F

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