Structural, magnetic and dielectric properties of magnesium doped nickel ferrite nanoparticles

• Published in: Journal of alloys and compounds Vol. 650; pp. 116 - 122
• Main Authors: Moradmard, H., Farjami Shayesteh, S., Tohidi, P., Abbas, Z., Khaleghi, M.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 25.11.2015
• Subjects: Dielectric permittivity; Dielectric properties; Doping; Magnesium; Magnesium oxide; Magnetic properties; Mg-doped nickel ferrite; Nickel ferrites; Spinel structure; X-ray diffraction; X-rays; Mg-doped nickel ferrite; Dielectric permittivity; Spinel structure; Magnetic properties
• DOI: 10.1016/j.jallcom.2015.07.269
• ISSN: 0925-8388

Magnesia doped nickel ferrite nanopowders (Ni1−xMgxFe2O4, x = 0, 0.1, 0.3, 0.5, 0.7) have been synthesized by co-precipitation method and all samples were annealed at 900 °C. The structural, morphological and magnetic properties of the products were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray (EDX) spectroscopy and vibrating sample magnetometer (VSM). Also microwave dielectric properties were measured at frequencies 1 GHz–12 GHz. XRD analysis indicates that all samples have spinel structure and there is not any extra phase in all samples. The increase in magnesia concentration caused to variation in the average crystallite size and lattice constant. Doping magnesia in nickel ferrite gave rise to a decrease in the saturation magnetization whereas doping led to increase in coercivity field. The parameters like dielectric constant, dielectric loss and ac conductivity of the nanoparticles samples are studied in the frequency range from 1 to 12 GHz. All these parameters show, size dependent variations. Complex dielectric permittivity of samples was decreased by increasing in frequency. [Display omitted] •Co-precipitation synthesis of Mg doped Ni ferrite nanoparticles is reported.•Its structural, morphological, magnetic and dielectric behavior is studied.•Structural properties were characterized by XRD, SEM, and FTIR.•Doping magnesia in nickel ferrite gave rise to an increase in the HC field.•The particle size observed to change with increasing Mg concentration.