Powder X-ray diffraction, infrared and conductivity studies of AgSbMP{sub 3}O{sub 12} (M = Al, Ga, Fe and Cr)

New Nasicon type of compounds of composition AgSbMP{sub 3}O{sub 12} (M = Al, Ga, Fe and Cr) are synthesized by solid-state method. All the compounds crystallize in the hexagonal lattice with space group R3-barc. The infrared spectra of these compounds show characteristic bands due to PO{sub 4} group...

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Bibliographic Details
Published in:Materials research bulletin 2008-06, Vol.43 (6)
Main Authors: Rambabu, G., Anantharamulu, N., Koteswara Rao, K., Prasad, G., Vithal, M.
Format: Article
Language:English
Subjects:
ABSORPTION SPECTROSCOPY
ACTIVATION ENERGY
ALUMINIUM COMPOUNDS
ANTIMONY COMPOUNDS
CHROMIUM COMPOUNDS
GALLIUM COMPOUNDS
HEXAGONAL LATTICES
IMPEDANCE
INFRARED SPECTRA
IONIC CONDUCTIVITY
IRON COMPOUNDS
MATERIALS SCIENCE
MILLI EV RANGE
PHOSPHATES
SILVER COMPOUNDS
SPACE GROUPS
X-RAY DIFFRACTION
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Summary:New Nasicon type of compounds of composition AgSbMP{sub 3}O{sub 12} (M = Al, Ga, Fe and Cr) are synthesized by solid-state method. All the compounds crystallize in the hexagonal lattice with space group R3-barc. The infrared spectra of these compounds show characteristic bands due to PO{sub 4} group. The frequency independent conductivity of these compounds shows Arrhenius type behavior and the activation energy for conduction is in the range 0.40-0.55 eV. Frequency independent conductivity ({sigma}{sub dc}) studies and frequency dependent ({sigma}{sub ac}) impedance measurements correlate well. The Cole-Cole plots do not show any spikes on the lower frequency side indicating negligible electrode effects. The activation energies obtained from the plots of log {sigma}{sub dc}T versus 1/T, log {sigma}{sub ac}(0) versus 1/T and log {tau} versus 1/T are approximately the same. The peak width at half height for electric modulus (M'') plot is {approx}1.24 decades for all samples, which is close to 1.14 decades observed for Debye solid. The height of electric modulus (M'') obtained from the experimental plots are close to that of M'' (max) = C{sub 0}/2C indicating the Debye nature of the samples.
ISSN:0025-5408
1873-4227
DOI:10.1016/j.materresbull.2007.06.022