Thermodynamic stability, structural and electrical characterization of mixed ionic and electronic conductor La2Mo2O8.96 | Zendy

J. VegaCastillo | Zendy; Uday K. Ravella | Zendy; Gwenaël Corbel | Zendy; Philippe Lacorre | Zendy; A. Caneiro | Zendy

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

Author(s) -

J. VegaCastillo,

Uday K. Ravella,

Gwenaël Corbel,

Philippe Lacorre,

A. Caneiro

Publication year - 2012

Publication title -

dalton transactions

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.98

H-Index - 184

eISSN - 1477-9234

pISSN - 1477-9226

DOI - 10.1039/c2dt30261f

Subject(s) - thermogravimetric analysis , partial pressure , dielectric spectroscopy , materials science , ionic bonding , amorphous solid , conductor , analytical chemistry (journal) , oxide , ionic conductivity , oxygen , chemical stability , diffraction , conductivity , electrical resistivity and conductivity , electrochemistry , thermodynamics , chemistry , ion , electrode , crystallography , composite material , metallurgy , organic chemistry , physics , electrical engineering , electrolyte , optics , engineering

Thermogravimetric analysis (TGA) technique in controlled oxygen partial pressure (pO(2)) atmospheres has been used to obtain equilibrium oxygen content data as a function of pO(2) on the La(2)Mo(2)O(9-δ) system resulting from the partial reduction of fast oxide-ion conductor La(2)Mo(2)O(9) (LM). Thermodynamic conditions for stabilization of crystalline La(7)Mo(7)O(30) and amorphous La(2)Mo(2)O(7-y) at 718 °C have been determined and discussed. At 608 °C, the compound reported for the first time La(2)Mo(2)O(8.96) (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).

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