Skip navigation
Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/12742
Title: Effect of K doping on Mo6+stability and ionic conductivity study in La2Mo2O9 as oxide-ion conductor
Authors: Siddharth
Sil, Anjan
Bysakh S.
Published in: Materials Research Express
Abstract: The structural stability and ionic conductivity of K doped LAMOX have been extensively studied by many researchers. But the chemical state analysis and relaxation dispersion studies of La1.9K0.1Mo2O9-δ, La1.8K0 2Mo2O9-δ and pristine La2Mo2O9 are very scarcely reported. Here in the present study, the chemical state analysis, relaxation dispersion along with structural stability and ionic conductivity studies are done to investigate the effect of K doping in LAMOX. The room temperature XRD analysis of La1.9K0.1Mo2O9-δ, La1.8K0 2Mo2O9-δ compounds shows formation of β-LAMOX phase along with K2O as an additional phase. The x-ray photoelectron spectroscopy (XPS) results are analysed for both K doped compositions sintered in air as well as in Ar 90%-H2 10% atmosphere. Both the compositions show good amount of Mo6+ stabilisation in Ar-H2 atmosphere. The Raman spectroscopy analysis of La1.9K0.1Mo2O9-δ and La2Mo2O9 shows the signature of oxygen vacancies at 866 cm-1. The activation energy (E a) is found to be 0.66 eV for La1.8K0 2Mo2O9-δ. The low value of d.c. conductivity of 12 μS cm-1 at 400 °C may be due to the hindrance imposed by large ionic radius of K+ ion as compared to La3+ ion in the structure which restricts its applications in IT-SOFCs. © 2019 IOP Publishing Ltd.
Citation: Materials Research Express (2019), 6(5): -
URI: https://doi.org/10.1088/2053-1591/ab0470
http://repository.iitr.ac.in/handle/123456789/12742
Issue Date: 2019
Publisher: Institute of Physics Publishing
Keywords: ionic conductivity
K doped La2Mo2O9
solid oxide fuel cell electrolyte
x-ray photoelectron spectroscopy
ISSN: 20531591
Author Scopus IDs: 57201779270
7003754102
6603150324
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, CSIR- Central Glass and Ceramic Research Institute, Kolkata, 700032, India
Appears in Collections:Journal Publications [MT]

Files in This Item:
There are no files associated with this item.
Show full item record


Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.