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Title: Correlation of structure and ion conduction in La{sub 2−x}Y{sub x}Mo{sub 2}O{sub 9} (0 ≤ x ≤ 0.2) oxygen ion conductors

Correlation of structure and ion conduction of La{sub 2−x}Y{sub x}Mo{sub 2}O{sub 9} (0 ≤ x ≤ 0.2) has been investigated. The cubic symmetry with space group P2{sub 1}3 and other structural parameters are obtained from Rietveld refinement of X-ray diffraction patterns of Y doped samples. The average lanthanum-oxygen and molybdenum-oxygen distances are obtained from the electron density contour plot. The transmission electron microscopic study confirms the cubic nature of the samples and also provides an estimate of thickness of the grain boundary. The scanning transmission electron microscope energy dispersive spectrometer mapping confirms the different orientations of grains. The composition dependence of the ionic conductivity has been correlated with that of O2 and O3 site occupancies in the [O1La{sub 3}Mo] antitetrahedral unit. The different vibrational modes in the low frequency region due to vibration of Mo-O bands are confirmed from the analysis of FTIR and Raman spectra. The full widths at half maximum of most of the Mo-O bands are found to be independent of Y doping. Additionally, the shifts in the position of Raman bands are correlated with unit cell parameter using Grüneisen constant.
Authors:
;  [1]
  1. Department of Solid State Physics, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032 (India)
Publication Date:
OSTI Identifier:
22490714
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 23; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CORRELATIONS; CUBIC LATTICES; DOPED MATERIALS; ELECTRON DENSITY; FOURIER TRANSFORMATION; GRAIN BOUNDARIES; INFRARED SPECTRA; LANTHANUM; MAPPING; MOLYBDENUM; ORIENTATION; OXYGEN IONS; RAMAN SPECTRA; SPACE GROUPS; SPECTROMETERS; THICKNESS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION