Dielectric relaxation behavior of AxCo1-xFe2O4 (A = Zn, Mg) mixed ferrites

被引:141
作者
Verma, Kavita [1 ]
Kumar, Ashwini [1 ]
Varshney, Dinesh [1 ]
机构
[1] Devi Ahilya Univ, Sch Phys, Indore 452001, Madhya Pradesh, India
关键词
Chemical synthesis; X-ray diffraction; Scanning electron microscopy; Dielectric response; ELECTRICAL-PROPERTIES; MAGNETIC-PROPERTIES; ZINC FERRITES; IMPEDANCE; CONDUCTIVITY; POLARIZATION; SIZE;
D O I
10.1016/j.jallcom.2012.02.089
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Samples of A(x)Co(1-x)Fe(2)O(4) (A = Zn, Mg; x = 0.0, 0.5) ferrite were synthesized by chemical co-precipitation method. Room temperature Rietveld - refined X-ray diffraction pattern elucidate the formation of single-phase cubic structure with Fd3m space group for all prepared samples. Slight variation in the lattice parameter of Mg doped CoFe2O4 has been observed when compared with CoFe2O4 and Zn0.5Co0.5Fe2O4. The variation of permittivity and ac conductivity as a function of frequency reveals that dispersion in all these ferrites is attributed to Maxwell-Wagner type of interfacial polarization. The minimum value of loss tangent (similar to 0.04) at 5 kHz makes A(x)Co(1-x)Fe(2)O(4) most suitable material for microwave application. Temperature dependent dielectric constant and loss tangent of all the three samples shows an increasing trend with increase in temperature. The activation energy (E-a) for CoFe2O4, Co0.5Mg0.5Fe2O4 and Co0.5Zn0.5Fe2O4 were found to be 0.81 eV, 0.76 eV and 0.63 eV respectively. The electrical modulus study clearly reveals the presence of non-Debye type of dielectric relaxation in the present material. (C) 2012 Elsevier B. V. All rights reserved.
引用
收藏
页码:91 / 97
页数:7
相关论文
共 36 条
[1]   Dielectric behaviour in Ni-Zn ferrites [J].
Abdeen, AM .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1999, 192 (01) :121-129
[2]   Frequency dependence of the complex impedances and dielectric behaviour of some Mg-Zn ferrites [J].
Abdullah, MH ;
Yusoff, AN .
JOURNAL OF MATERIALS SCIENCE, 1997, 32 (21) :5817-5823
[3]   Ac conductivity and relaxation processes in silver selenochromate glass [J].
Baskaran, N ;
Govindaraj, G ;
Narayanasamy, A .
SOLID STATE IONICS, 1997, 98 (3-4) :217-227
[4]   Dielectric properties of Cu substituted Ni0.5-xZn0.3Mg0.2Fe2O4 ferrites [J].
Bhandare, M. R. ;
Jamadar, H. V. ;
Pathan, A. T. ;
Chougule, B. K. ;
Shaikh, A. M. .
JOURNAL OF ALLOYS AND COMPOUNDS, 2011, 509 (06) :L113-L118
[5]  
Cullity B.D., 1972, Introduction to Magnetic Materials
[6]  
Dais A., 1998, J. Mater. Res, V13, P2190
[7]   Chemical, mechanical and dielectric properties after sintering of hydrothermal nickel-zinc ferrites [J].
Dias, A ;
Moreira, RL .
MATERIALS LETTERS, 1999, 39 (01) :69-76
[8]   Optical and magneto-optical polar Kerr spectra of Fe3O4 and Mg2+- or Al3+-substituted Fe3O4 [J].
Fontijn, WFJ ;
vanderZaag, PJ ;
Devillers, MAC ;
Brabers, VAM ;
Metselaar, R .
PHYSICAL REVIEW B, 1997, 56 (09) :5432-5442
[9]   Finite size effects on the electrical properties of sol-gel synthesized CoFe2O4 powders:: deviation from Maxwell-Wagner theory and evidence of surface polarization effects [J].
George, Mathew ;
Nair, Swapna S. ;
Malini, K. A. ;
Joy, P. A. ;
Anantharaman, M. R. .
JOURNAL OF PHYSICS D-APPLIED PHYSICS, 2007, 40 (06) :1593-1602
[10]   Optical, magnetic and electrical investigation of cobalt ferrite nanoparticles synthesized by co-precipitation route [J].
Gul, I. H. ;
Maqsood, A. ;
Naeem, M. ;
Ashiq, M. Naeem .
JOURNAL OF ALLOYS AND COMPOUNDS, 2010, 507 (01) :201-206