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SHI induced modification in ferrites and ferrite-polymer composites’

Goal: Project is based on SHI induced modification in spinel, hexa ferrites and their composites

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Rajshree B Jotania
added 2 research items
This special volume on ‘Ferrites and Ceramic Composites II’ contains a wide range of issues pertaining to nanomaterials. The volume will be of special interest to scientists and researchers who deal with Nanoparticles. The book covers a wide range of topics: Nanoparticles Synthesis and Properties, Nanoferrites, Ferrite Fibres and Nanofibres, Biomedical Applications.
Rajshree B Jotania
added 2 research items
W-type BaZn2Fe16O27 hexaferrite powder was synthesized using a co-precipitation technique. The synthesized precursors were calcined at 950 degrees C for 4 h in static air atmosphere in order to prepare barium-zinc hexaferrite powder. The effect of swift heavy ion irradiation on modifications in the structural and morphological properties of BaZn2Fe16O27 hexaferrite powder has been studied using 200 MeV Ag16+ ions irradiation with the fluence of 1 x 10(13) ions/cm(2). Prepared hexaferrite samples were characterized before and after irradiation using various instrumental techniques such as X-ray diffraction (XRD), Fourier transform infrared spectroscopy and scanning electron microscopy measurements. XRD results revealed that the pristine sample has two phases, namely the W-phase and M-phase, while the irradiated sample showed only the mono-W-phase of BaZn2Fe16O27, which implies that there is a phase transformation from the M- to W-phase. This shows that there is an enhancement of the W-phase after irradiation. It was observed that the particle size decreases after irradiation.
Swift heavy ion irradiation of material is a unique tool to modify the properties of the material and it provides an alternative to photons for introducing electronic excitations into the material. In the present investigation, the changes in structural, morphological and magnetic properties of SrFe12O19 ferrite (prepared using co-precipitation and SHS routes), induced by 200 MeV Ag+16 ion irradiation have been studied. In order to study the effect of the electronic stopping power (dE/dX) e on these properties the energy of the projectile was so chosen that it could easily pass through the samples. Structural properties of these ferrites have been studied and compared with the properties after Swift Heavy Ion (SHI) irradiation of 200 MeV Ag16+ at different fluences. Samples were characterized using different experimental techniques, like Fourier Transform Infra-red (FT-IR), X-ray Diffraction (XRD), Scanning Electrom Microscope (SEM), Vibrating Sample Magnetometer (VSM) and LCR meter. FTIR spectra for pristine as well as the irradiated samples were recorded for wave number ranges from 4000-400 cm-1 using the KBr pellet method. FTIR measurement of the bonds' vibration modes in all samples were carried out to determine the change in MO bonding due to irradiation. The MO absorption band is observed in all samples. The intensity of absorption bands increased in irradiated samples, which confirms the formation of strong ferric oxide band. Crystallinity of pristine and irradiated samples was investigated by XRD technique. All XRD peaks were indexed using POWDER X software. XRD result confirms the formation of mono phase. It is observed from XRD analysis that after the irradiation, the intensity of all the peaks and FWHM were increased. There is no significant change in peak position but the intensity is decreased and FWHM is increased continuously with ion fluence. XRD patterns confirm that the ferrite structure is retained even after irradiation. Surface morphology of pristine and irradiated samples was studied using a scanning electron microscopy. It is observed from SEM images that the particle size decreases after irradiation and particles become more homogeneous. Dielectric and magnetic measurements were also carried out.
Rajshree B Jotania
added a research item
A series of M-type, Sr0.5Co0.5LaxFe12-xO19 (x = 0.00, 0.05, 0.15 and 0.20) hexaferrites was prepared using the simple heat treatment method.
Rajshree B Jotania
added a research item
Composites of SrFe12O19 hexaferrite + CoFe2O4 spinel ferrite were prepared by an SHS (Self propagating High temperature Synthesis) route and three samples were irradiated at five different fluences from 3×1011 to 2×1013 ions/cm2. The effect of difference fluences on structural and Magnetic properties was investigated. This work is supported by DRS-SAP, Phase I and DST-FIST, India
Rajshree B Jotania
added a research item
X-type Barium-Zinc hexaferrite powder with chemical composition Ba2 Zn 2Fe28O46 has been prepared using citrate gel auto combustion technique. The combusted powder waspre-heated at 550 °C for 4 hours followed by final calcinations of 1100 °C and 1250 °C for 5 hoursrespectively. Prepared hexaferrite samples were characterizedusingdifferent instrumental techniques such as FTIR and XRD. XRD analysis of the sample calcined at 1250 °C revealed formation of mono phase of X-type hexaferrite; while the sample calcined at 1100 °C shows multiphases of M, W and X-type hexaferrites. FTIR spectra of both samples show stretching of metal-oxide bands.
Rajshree B Jotania
added a project goal
Project is based on SHI induced modification in spinel, hexa ferrites and their composites