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The infrared absorption and dielectric properties of Li-Ga ferrite
Faculty
Science
Year:
2009
Type of Publication:
Article
Pages:
294-300
Authors:
Mansour, S. F, Zaki, H. M, Elmosalami, T. A, Dhahri, E, Mazen, S. A
DOI:
10.1016/j.jallcom.2008.02.035
Journal:
JOURNAL OF ALLOYS AND COMPOUNDS ELSEVIER SCIENCE SA
Volume:
470
Research Area:
Chemistry; Materials Science; Metallurgy \& Metallurgical Engineering
ISSN
ISI:000263975100064
Keywords :
IR, Dielectric properties, Li-Ga ferrites
Abstract:
The investigated compositions of the Li-Ga ferrite system Li(0.5)Fe(2.5-x)Ga(x)O(4) (where x = 0.0. 0.1, 0.2, 0.3, 0.4 and 0.5) were studied by means of infrared (IR) spectroscopy. The analysis of IR spectra indicates the presence of splitting in the absorption band due to the presence of Fe(2+) ions in ferrite. The dielectric constant epsilon', the dielectric loss epsilon `' and the loss tangent tan delta were measured at elevated temperatures ranging from room temperature up to 850 K as a function of frequency(f = 10(2)-10(6) Hz) for the investigated compositions. Maximum peak in tan delta and inverse peaks in epsilon' appeared for some samples due to the resonance phenomenon. The obtained data were discussed based on the valence exchange between (Fe(2+) and Fe(2+)) and (Ga(3+) and Ga(2+)), i.e. hopping mechanism. (C) 2008 Elsevier B.V. All rights reserved.
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