Dielectric and electrical characteristics of mechanically synthesized Ni-Zn ferrite nanoparticles

JOURNAL OF ALLOYS AND COMPOUNDS

卷:708

Article

Hajalilou, A.^1,2  Kamari, H. Mohamed³  Shameli, K.⁴ 

[1] Univ Putra Malaysia UPM, Inst Adv Technol ITMA, Mat Synth & Characterizat Lab, Serdang 43400, Selangor, Malaysia

[2] Univ Tabriz, Fac Mech Engn, Dept Mat Engn, Tabriz, Iran

[3] Univ Putra Malaysia UPM, Dept Phys, Serdang 43400, Selangor, Malaysia

[4] Univ Putra Malaysia, Dept Chem, Serdang 43400, Selangor, Malaysia

关键词: Ni-Zn ferrite;    Electrical properties;    Milling atmosphere;    Sintering;    Dielectric properties;    XPS analysis;   

DOI  :  10.1016/j.jallcom.2017.03.030

来源: Elsevier

【 摘 要 】

Ni-Zn ferrite nanoparticles were synthesized via mechanical activation of Zn, NiO and Fe2O3 powders in a high energy planetary ball mill. The 30 h-milled samples in argon, oxygen and air atmospheres were pressed in pellet and toroid shape form and were sintered from 500 degrees C to 900 degrees C with 100 degrees C increments. The X-ray diffraction patterns results indicated a single phase Ni-Zn ferrite formation with a cubic-spinel structure in all the samples sintered at 500 degrees C. The milling atmosphere had a key role in the synthesis, microstructure and properties of the samples in such a way that this effect sustained even after the completion of sintering process. Thus, the main goal of this study is to scrutinize the effect of sintering temperature in the 30-h-milled samples in different atmospheres on DC electrical resistivity and dielectric behavior of Ni-Zn ferrite samples. The results indicated that although electrical resistivity decreased, dielectric behaviors, i.e. constant, loss and tand increased with increase in sintering temperature. The milled samples in argon had the highest resistivity of 1.2 x 10(6) Omega cm at 500 degrees C, and lowest dielectric constant and loss (similar to 4.67 x 10(2) and 1.7 at 300 K and frequency 10(6) MHz, respectively) compared to other samples owing to more homogeneity and smaller average crystallite size, making them a good candidate for high frequency applications. X-ray photoelectron spectroscopy (XPS) revealed the presence of metal ions in their proper valence in the Ni-Zn ferrite crystal structure. Noticeably, a variation in the binding energy for the milled samples in different atmospheres is attributed to the changes in surroundings of Fe3+ and Zn2+/or Ni2+, due to non-equilibrium distribution of cations in tetrahedral and octahedral sites, which is further confirmed by the XRD patterns. (C) 2017 Elsevier B.V. All rights reserved.

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