Influence of Ho–Ni–Mn substitution on the structural and magnetic behavior of Ba–Sr Co2Z-type nanohexaferrites extension up to Mossbauer investigations
A series of Co2Z-type Ba–Sr nanohexaferrites Ba1.5Sr1.5Co2−zHozMnxNiyFe24−x−yO41 (z = 0.0, 0.05, 0.10, 0.15, 0.20, x = y = 0.0, 0.25, 0.5, 0.75, 1.00) have been synthesized using sol–gel auto-combustion synthesis route. The effect of Ho–Ni–Mn substitutions on crystallographic and magnetic properties of synthesized nanohexaferrites was investigated using XRD, VSM, and Mössbauer spectroscopy. Microstructural analysis showed single-phase crystal structures without any impurities and hexagonal with the space group P63/mmc. The average variation in crystallite size ranges from 43 to 60 nm with a slight increase in X-ray density and appreciable decrease in porosity was observed for different dopants. FE-SEM (Nova Nano SEM-450) substantiates the hexagonal structure and HR-TEM images assisted with SAED pattern confirm the crystalline quality and FWHM of the material, which significantly support the XRD results. FTIR spectra showed two characteristic metal stretching peaks in the range of 400–600 cm−1 due to the substitution of Ho–Ni–Mn. Magnetic measurements show maximum magnetic saturation (Ms) at 44.04 emu g−1 and elevated value of coercivity (Hc) 224Oe imparting typical characteristics of soft ferrite with high coercivity. Mössbauer analysis with least squares fit sextets of six distinguishable sites at room temperature for all samples substantially supports the results of VSM. The materials with large coercivity are useful in permanent magnet applications. The prepared composites could be useful for applications in microwave absorbing materials, magnetic storage, and the miniaturization of antennas for wireless communication devices.
One of the authors Ms. Kirti Singha is thankful to Prof. Mahavir Singh and Dr. Arun Kumar, Himachal Pradesh University, Shimla for Mössbauer fitting; Vinod Kumar, Department of Pharmacology and Toxicology, NIPER Mohali for providing HR-TEM facility, and Indian Institute of Technology, Mandi for research and instrumentation facilities.
- 1.J. Smit, H.P.J. Wijn, Ferrites (Philips Technical Library, Eindhoven, 1959)Google Scholar
- 2.A. Sharbati, S. Choopani, A. Ghasemi, Synthesis and magnetic properties of nanocrystalline Ba3Co2(0.8−x)Mn0.4Ni2xFe24O41 prepared by citrate sol-gel method. Dign. J. Nanomater. Biostruct. 6, 187 (2011).Google Scholar
- 4.J.P. Mohammad, G. Ali, R.G. Gholam, Characterization and investigation of magnetic and microwave properties of Al–Cr-substituted Z-type barium hexaferrite nanoparticles. J. Superconduct Novel Magn. 6, 795 (2016)Google Scholar
- 6.Kyoung-Seok M, Young-Min K, InTaek H, Sang-Eui L, Grain growth behavior of Ba1.5Sr1.5Co2Fe24O41 flakes in molten salt synthesis and the magnetic properties of flake/polymer composites. J. Appl. Phys. 120, 194102 (2016).Google Scholar
- 11.S.R. Gawali, K.G. Rewatkar, V.M. Nanoti, Structural and electrical properties of M-type nanocrystalline aluminium substituted calcium hexaferrites. Adv. Appl. Sci. Res. 3, 2672 (2012)Google Scholar
- 15.J.T. Lim, T. Kouh, C.S. Kim, Investigation of magnetic properties of Sr doped Ba3-xSrxCo2Fe24O41 Z-type Hexaferrite by Mössbauer spectroscopy. IEEE Trans. Magn. 51, Art no. 1800604 (2015).Google Scholar
- 16.Y. Liu, M.G. Drew, Y. Liu, J. Wang, Preparation, characterization and magnetic properties of the doped barium hexaferrites BaFe12−2xCox/2Znx/2SnxO19, x=0.0–2.0. J. Magn. Magn. Mater. 322, 814 (2010).Google Scholar
- 25.J.P. Hodges, S. Short, J.D. Jorgensen, X. Xiong, B. Dabrovski, S.M. Mini, C.W. Kimball, Evolution of oxygen-vacancy ordered crystal structures in the Perovskite series SrnFenO3n-1(n = 2, 4, 8, and ∞), and the relationship to electronic and magnetic properties. J Solid State Chem 151, 190 (2000)ADSCrossRefGoogle Scholar