Singh, Virender Pratap and Kumar, Gagan and Shah, Jyoti and Kumar, Arun and Dhiman, Meenakshi and Kotnala, R. K. and Singh, Mahavir (2015) Investigation of super-exchange interactions in BaHoxFe12-xO19 (0.1 <= x <= 0.4) nanohexaferrites and exploration at ultra high frequency region. Ceramics International, 41 (9). pp. 11693-11701. ISSN 0272-8842

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Abstract

BaHoxFe12-xO19 (x=0.1, 0.2, 0.3, 0.4) nanohexaferrites were successfully synthesized for the first time by sol-gel auto-combustion technique. X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy dispersive X-ray analysis (EDAX) were utilized to investigate the different structural parameters and elemental composition. Incorporation of Ho3+ ions increased the dc resistivity while a decrease in the saturation magnetization (M-s), 66.68-57.08 emu/g, followed by decrease in Curie temperature (766.83-758.15 K), exchange integral (J), and anisotropy was observed. The obtained values of M-s. were found to be very high as compared to the values reported in the bulk form. The dielectric constant (epsilon') and dielectric loss tangent (tan delta) were investigated as a function of frequency and the behavior is explained on the basis of Maxwell-Wagner model and Koop's theory. Additionally, a maiden attempt was made to explore the BaH(o)xFe(12-x)O(19) nanohexaferrites at ultrahigh frequencies and observed ultra-low magnetic loss (0.004-0.01) and dielectric loss (0.004-0.06).

Item Type:	Article
Uncontrolled Keywords:	Sol–gelprocesses; Nanostructures; Electric, dielectricandmagneticproperties
Subjects:	Materials Science
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	28 Sep 2016 06:26
Last Modified:	28 Sep 2016 06:26
URI:	http://npl.csircentral.net/id/eprint/1871

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