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Title: Structural and dielectric properties of LaBi₂Fe₅O₁₂
Authors: Jawahar, K
Choudhary, R N P
Issue Date: Apr-2008
Publisher: CSIR
Abstract: The polycrystalline sample of LaBi₂Fe₅O₁₂ (LBIG) distorted perovskite compound is prepared using a high-temperature solid-state reaction technique. Room temperature preliminary X-ray diffraction (XRD) studies of the compound show the tetragonal splitting. It confirms the formation of single-phase compound with 2% of pyrochlore phase. The elemental content of the compound has been verified by energy dispersive spectroscopy (EDS) microanalysis. Microstructural analysis by scanning electron microscopy (SEM) shows that the grains are homogeneously as well as uniformly distributed throughout the surface of the sample. Dielectric studies as a function of temperature (30-360C) at four different frequencies (1, 10, 100, 1000 kHz) yielded a dielectric anomaly at 325C. It is interesting to note that the loss tangent (tan δ) seems to be reduced at higher frequencies after reaching the instrumental saturation. Also, dielectric measurement as a function of frequency (100 Hz-1 MHz) at room temperature reveals the presence of different types of polarization mechanisms involved in the material. Again the frequency dependent loss tangent (tan δ) shows the sinusoidal variation, which is unusual for this kind of measurement. This variation has been confirmed by repeating the measurement at various temperatures.
Page(s): 203-206
ISSN: 0971-4588
Source:IJEMS Vol.15(2) [April 2008]

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