Investigation of super-exchange interactions in BaHoxFe12−xO19 (0.1≤x≤0.4) nanohexaferrites and exploration at ultra high frequency region. Issue 9 (November 2015)

• Record Type: Journal Article
• Authors: Singh, Virender Pratap; Kumar, Gagan; Shah, Jyoti; Kumar, Arun; Dhiman, Meenakshi; Kotnala, R.K.; Singh, Mahavir
• Is Part Of: Ceramics international. Volume 41:Issue 9(2015)Part B
• Page Start: 11693
• Page End: 11701
• Publication Date: 2015-11
• Subjects: A. Sol–gel processes -- Nanostructures -- Electric, dielectric and magnetic properties; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2015.05.133
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: BaHo x Fe12− x O19 ( 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 Ho 3+ 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 ( ε′ ) and dielectric loss tangent (tan δ ) 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 BaHo x Fe12− x O19 nanohexaferrites at ultra-high frequencies and observed ultra-low magnetic loss (0.004–0.01) and dielectric loss (0.004–0.06).