Transport properties of SrMoO4/MoO3 composites

Transport properties of SrMoO4/MoO3 composites

The work is devoted to the study of transport properties at the SrMoO 4 /MoO 3 interface and examination of composite phases based on these compounds. The mass transfer in the (‒)MoO 3 /SrMoO 4 /MoO 3 (+) cell is studied in the spontaneous mode (with no polarization) and electric field-induced mode....

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Bibliographic Details
Published in:Russian journal of electrochemistry Vol. 53; no. 2; pp. 187 - 195
Main Authors: Koteneva, E. A., Pestereva, N. N., Astapova, D. V., Neiman, A. Ya, Animitsa, I. E.
Format: Journal Article
Language:English
Published: Moscow Pleiades Publishing 01-02-2017
Springer Nature B.V
Subjects:
Briquets
Chemistry
Chemistry and Materials Science
Composite materials
Current carriers
Electric fields
Electrochemistry
Mass transfer
Physical Chemistry
Polarization
Temperature dependence
Transport properties
Vapor phases
strontium molybdate SrMoO
molybdenum oxide MoO
transport numbers
metacomposite
conductivity
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Summary:The work is devoted to the study of transport properties at the SrMoO 4 /MoO 3 interface and examination of composite phases based on these compounds. The mass transfer in the (‒)MoO 3 /SrMoO 4 /MoO 3 (+) cell is studied in the spontaneous mode (with no polarization) and electric field-induced mode. In the spontaneous mode, MoO 3 is drawn onto the inner surface of SrMoO 4 ceramic briquette. Under a polarization, molybdenyl ion {MoO 2 } 2+ is one of the charge carriers, which is evidenced by the Tubandt method. Thus, both spontaneously and under an external polarization, MoO 3 is transferred onto the inner surface of SrMoO 4 ceramics. It is found that the ionic transfer prevails for SrMoO 4 : the average transport numbers by the emf method are close to unity, the oxygen activity in the gas phase (in the range 0.21…10 –5 atm) has no effect on the conductivity. The composites {SrMoO 4 – x MoO 3 } (where x = 1, 5, 10, 15, 20 mol %) are fabricated; the presence of two phases is evidenced by the X-ray diffraction analysis. The temperature dependence of the total conductivity is determined. In the range of small MoO 3 additions to SrMoO 4 , the conductivity steeply increases revealing the similarity to the {MeWO 4 – x WO 3 (Me–Ca, Sr, Ba)} composites.
ISSN:1023-1935
1608-3342
DOI:10.1134/S1023193517020094