In this paper, we focused on microwave sintered NiTiO3 nanoparticles synthesized via sol–gel method. The crystal structure was determined by the X-ray diffraction. Vibrational bands related to Ni–O and Ti–O bands were confirmed using the Fourier transform infrared spectrum. These NiTiO3 ceramics obeyed semiconductor behavior of Arrhenius type. The activation energy was found to be 0.04 μeV. The M–H curve exhibited superparamagnetic behavior at room temperature. Keywords: NiTiO3, X-ray diffraction, HRSEM, Impedance analysis, M–H curve

Pavithra D

Department of Integrative Biology

School of Bio Sciences and Technology

Vellore Campus

Madhuri W

Department of Physics

School of Advanced Sciences

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Materials Chemistry and Physics

Biocompatible Mg1− xZnxFe2O4 (x = 0.2, 0.4, 0.5, 0.6 &amp; 0.8) nanoparticles were synthesized by solvothermal reflux method. All compounds were crystallized in cubic spinel structure with slightly enhance of lattice parameter with biocompatible substituent Zn2+ concentration. All compounds were shown spherical geometry with average particle diameter is around 12 nm (colloidal size). The spinel structure formation was confirmed by X-ray diffraction,electron diffraction, infrared, Raman shift measurements. Infrared analysis shows oleic acid coating on the surface of nanoparticles and TGA analysis shows that oleic acid desorbs from nanoparticle by decomposition at around 400 °C. UV-Vis-NIR spectra show all the compounds show energy band gap in the semiconductor range (≈ 1.9 eV). All compounds show superparamagnetic characteristics at room temperature with enhanced saturated mass magnetization (Ms) with Zn2+ concentration up to x = 0.5 and then reduces with further enhance of x up to 0.8. The Ms changes were ascribed to occupation of Zn2 + at tetrahedral sites and proportional enhance of Fe3+ at octahedral sites. The enhanced Fe3+ concentration at octahedral sublattice leads to formation Fe3+-O2−-Fe3+ networks which favor antiferromagnetic interactions due to superexchange phenomenon. Photocatalytic activity of all compounds were studied through methylene blue (MB) degradation analysis. All compounds show ≈ 96% degradation of MB upon 70 min irradiation of light on photoreactor vessel. In addition, photocatalytic activity (degradation efficiency) enhances with Zn2 + concentration in MgFe2O4. The Zn2+ substitution enhances both Ms and photocatalytic activity biocompatible of MgFe2O4 nanoparticles. © 2017

Journal of Photochemistry and Photobiology B: Biology

Photocatalytic study and superparamagnetic nature of Zn-doped MgFe 2 O 4 colloidal size nanocrystals prepared by solvothermal reflux method

Polycrystalline MgCuZn ferrites with chemical formula Mg 0.50-xCuxZn0.50Fe2O4 (x = 0.00, 0.05, 0.10, 0.15, 0.20, 0.25 and 0.30) were prepared by microwave sintering method. These powders were calcined, compacted and sintered at 950 °C for 30 min. Structural, microstructural and elemental analyses were carried out using X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive X-ray spectrometry (EDS), respectively. The lattice parameter is found to increase with increasing copper content. A remarkable densification is observed with the addition of Cu ions in the ferrites. The sintered ferrite was characterized for initial permeability, dielectric constant and dielectric loss tangent and ac conductivity measurements. The temperature variation of the initial permeability of these samples was carried out from 30 °C to 200 °C. The dielectric constant, dielectric loss tangent and ac conductivity have been measured in the frequency range of 100 Hz to 1 MHz. Initial permeability and dielectric constant were found to increase and dielectric loss decreased with Cu substitution for Mg, up to x = 0.20. The ferrite powder prepared is suitable for the application in multilayer chip inductor due to its low-temperature sinterability, good magnetic properties and low loss at high frequency. © 2010 Elsevier B.V.

Materials Science and Engineering C

Influence of copper substitution on magnetic and electrical properties of MgCuZn ferrite prepared by microwave sintering method

Materials Science in Semiconductor Processing

Comparison of nickel titanate (NiTiO3) powders synthesized by sol–gel and solid state reaction

Industrial & Engineering Chemistry Research

Sonochemical Synthesis of Mesoporous NiTiO3 Ilmenite Nanorods for the Catalytic Degradation of Tergitol in Water

Materials Letters

Morphological evolution of hierarchical nickel titanates by elevation of the solvothermal temperature

Electrical and magnetic properties of NiTiO 3 nanoparticles synthesized by the sol-gel synthesis method and microwave sintering

Journal	Data powered by TypesetMaterials Chemistry and Physics
Publisher	Data powered by TypesetElsevier BV
ISSN	0254-0584
Open Access	0