Structural, morphological, magnetic and dielectric characterization of nano-phased antimony doped manganese zinc ferrites

被引:29
作者
Sridhar, Ch. S. L. N. [1 ]
Lakshmi, Ch. S. [2 ]
Govindraj, G. [3 ]
Bangarraju, S. [4 ]
Satyanarayana, L. [5 ]
Potukuchi, D. M. [6 ]
机构
[1] Vignana Bharathi Inst Technol, Dept Phys, Hyderabad 501301, Telangana, India
[2] Regency Inst Technol, Dept Phys, Pondicherry 533464, India
[3] Pondicherry Univ, Dept Phys, Sch Phys Chem & Appl Sci, Pondicherry 605014, India
[4] Andhra Univ, Dept Phys, Visakhapatnam 530003, Andhra Pradesh, India
[5] Indian Inst Chem Technol CSIR, Hyderabad 500007, Andhra Pradesh, India
[6] Jawaharlal Nehru Technol Univ Kakinada, Dept Phys, Univ Coll Engn, Kakinada 533003, India
关键词
Hydrothermal method; Crystallite size; Porosity; Saturation magnetization; Dielelctric constant; Ac conductivity; Loss factor; Hopping and Cationic distribution; LOW-TEMPERATURE SYNTHESIS; MN-ZN FERRITES; ELECTRICAL-CONDUCTIVITY; NICKEL-ZINC; HYDROTHERMAL SYNTHESIS; CATION DISTRIBUTION; FINE PARTICLES; BEHAVIOR; NIFE2O4; MICROSTRUCTURE;
D O I
10.1016/j.jpcs.2016.01.006
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Nano-phased doped Mn-Zn ferrites, viz., Mn0.5-x/2Zn0.5-x/2SbxFe2O4 for x=0 to 0.3 (in steps of 0.05) prepared by hydrothermal method are characterized by X-ray diffraction, Infrared and scanning electron microscopy. XRD and SEM infer the growth of nano-crystalline cubic and hematite (alpha-Fe2O3) phase structures. IR reveals the ferrite phase abundance and metal ion replacement with dopant. Decreasing trend of lattice constant with dopant reflects the preferential replacement of Fe(3+)ions by Sb(5+)ion. Doping is found to cause for the decrease (i.e., 46-14 nm) of grain size. An overall trend of decreasing saturation magnetization is observed with doping. Low magnetization is attributed to the diamagnetic nature of dopant, abundance of hematite (alpha-Fe2O3) phase, non-stoichiometry and low temperature (800 degrees C) sintering conditions. Increasing Yafet-Kittel angle reflects surface spin canting to pronounce lower M-s. Lower coercivity is observed for x <= 0.1, while a large results for higher concentrations. High ac resistivity (similar to 10(6) ohm-cm) and low dielectric loss factor (tan delta similar to 10(-2)-10(-3)) are witnessed. Resistivity is explained on the base of a transformation in the Metal Cation-to-Oxide anion bond configuration and blockade of conductivity path. Retarded hopping (between adjacent B-sites) of carriers across the grain boundaries is addressed. Relatively higher resistivity and low dielectric loss in Sbdoped Mn-Zn ferrite systems pronounce their utility in high frequency applications. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码:70 / 84
页数:15
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