期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 566, 期 -, 页码 112-119出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2013.02.129
关键词
Nanoparticles; Ferrites; Transmission electron microscopy; Dielectric constant; ac Conductivity; dc Magnetization
资金
- National Plan for Science and Technology (NPST), King Saud University [10NAN1200-02]
Nanoscale Ni0.7-xMgxCu0.3Fe2O4 (0.0 <= x <= 0.5) ferrite powders were prepared by sol-gel method and obtained as dried gel after successful reaction between respective metal nitrates. X-ray diffraction (XRD) confirmed the successful synthesis of materials, and the formation of single-phase cubic spinel structure. The average particle sizes of these materials were found between 40 to 50 nm and confirmed by TEM (+/- 1). Dielectric constant (epsilon') measured in the frequency range (42 Hz to 5 MHz) was found to decrease with increasing frequency of the applied field, which shows normal behavior, and has been explained in the light of Maxwell-Wagner interfacial polarization. Debye relaxation peaks were observed for lower concentration of Mg in frequency dependent dielectric loss tangent curves. Real and imaginary parts of impedance (Z' and Z '') suggest existence of one relaxation mechanism which is attributed to the co-effect of grains and grain boundaries. The room temperature dc magnetization studies infer magnetic moment of Ni-Cu-Mg nanoparticles decreases with increasing Mg2+ doping content. (C) 2013 Elsevier B. V. All rights reserved.
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