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Title: Effect of grain boundary and Ar-H2 atmosphere on electrical conductivity of bulk a-La2Mo2O9 studied by impedance and x-ray photoelectron spectroscopy
Authors: Siddharth
Sil, Anjan
Bysakh S.
Published in: Materials Research Express
Abstract: The effect of grain boundary on electrical conductivity of α-La2Mo2O9 (LAMOX) over the temperature range of 300 °C to 400 °C has been investigated in this paper. Grain boundary effect characterisation for the mentioned temperature range has been done by electrochemical impedance spectroscopy (EIS). The calculated values of grain boundary width and specific grain boundary conductivity for α- La2Mo2O9 are 14.6 nm and 0.0146 μS/cm respectively. Total ionic conductivity calculated by EIS for α-La2Mo2O9 at 300 °C is 1 μS/cm. Resulting electrical conductivity of grain boundary comes out to be two orders less than the total electrical conductivity suggesting high activation energy requirement for grain boundary conduction. The electrical conductivity of α -La2Mo2O9 treated in Ar-H2 atmosphere (2.5 mS cm-1 at 200 °C) is approximately three orders higher than the electrical conductivity of LAMOX treated in air atmosphere. This may be attributed to reduction of Mo6+ to lower valance states in LAMOX as confirmed by x-ray photoelectron spectroscopy (XPS). Therefore, the low ionic conductivity nature of monoclinic phase of La2Mo2O9 has been explained on the basis of grain boundary conduction mechanism in the present study. © 2018 IOP Publishing Ltd.
Citation: Materials Research Express (2019), 6(3): -
Issue Date: 2019
Publisher: Institute of Physics Publishing
Keywords: grain boundary conductivity
grain interior
x-ray photoelectron spectroscopy
ISSN: 20531591
Author Scopus IDs: 57201779270
Author Affiliations: Siddharth, Department of Metallurgical and Materials Engineering, Indian Institute of Technology-Roorkee, Roorkee, 247667, India, Acoustics Instrumentation and Mechanical Systems Group, CSIR- Central Building Research Institute-Roorkee, Roorkee, 247667, India
Sil, A., Department of Metallurgical and Materials Engineering, Indian Institute of Technology-Roorkee, Roorkee, 247667, India
Bysakh, S., Advanced Materials Characterisation Unit, Central Glass and Ceramic Research Institute-Kolkata, Kolkata, 700032, India
Appears in Collections:Journal Publications [MT]

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