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&nbsp;μeV. The M–H curve exhibited superparamagnetic behavior at room temperature. Keywords: NiTiO3, X-ray diffraction, HRSEM, Impedance analysis, M–H curve

Madhuri W

Department of Physics

School of Advanced Sciences

Vellore Campus

Fulltext

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

Journal of Materials Research and Technology

This study was aimed at the low temperature synthesis of iron deficient samples of Ni-Cu-Zn ferrite using the microwave sintering technique. The samples were sintered at 950 °C for 30 min. Microstuctural and structural analyses were carried out using a scanning electron microscope (SEM) and X-ray diffraction (XRD), respectively. The lattice parameter was found to increase with increasing nickel concentration. The porosity calculated using X-ray density and measured density also shows a decreasing behavior with increasing nickel concentration. The variation of saturation magnetization was studied as a function of nickel concentration. All the compositions indicate that they are ferrimagnetic in nature. Initial permeability plotted against temperature at 10 kHz showed a sharp drop at Curie transition temperature and values observed at transition are found to be dependent on the nickel concentration. The dielectric constant, dielectric loss tangent and ac conductivity of all samples were measured at room temperature as a function of frequency. These parameters decrease with increase in frequency for all of the samples. The present ferrites are well 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. All rights reserved.

Current Applied Physics

Microwave sintering of iron deficient Ni-Cu-Zn ferrites for multilayer chip inductors

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 NiTiO3 nanoparticles synthesized by the sol–gel synthesis method and microwave sintering

Journal	Data powered by TypesetJournal of Materials Research and Technology
Publisher	Data powered by TypesetElsevier BV
ISSN	2238-7854
Open Access	Yes