Stability and transport properties of La2Mo2O9
authors Marrero-Lopez, D; Ruiz-Morales, JC; Perez-Coll, D; Nunez, P; Abrantes, JCC; Frade, JR
nationality International
author keywords coulometric titration; freeze-dried precursor; ion blocking; lanthanum molybdenum oxide; phase transition
abstract La2Mo2O9 samples were prepared from freeze-dried powder precursors and characterized by XRD, TG/DTA, SEM, electrical and electrochemical measurements. Pellets with different density were obtained by sintering at temperatures between 900 and 1100degreesC to obtain nearly dense samples with grain sizes in the range 1-8 mum. The electrical conductivity was measured using impedance spectroscopy. The capacitance and relaxation frequencies of the main contributions to the spectra were used to ascribe the contributions of grain interiors and internal interfaces, and their temperature dependence. A coulometric titration technique was used to evaluate the change of oxygen stoichiometry under moderately reducing conditions, and to estimate the stability limits under strongly reducing conditions. An ion-blocking method was used to evaluate the onset of n-type conductivity, and a combination of these results with total conductivity measurements was used to obtain the ionic transport number. A combination of oxygen stoichiometry changes and ion-blocking results was used to obtain estimates of mobility.
publisher SPRINGER
issn 1432-8488
year published 2004
volume 8
issue 9
beginning page 638
ending page 643
digital object identifier (doi) 10.1007/s10008-004-0504-2
web of science category Electrochemistry
subject category Electrochemistry
unique article identifier WOS:000223022400011
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