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X-ray and magnetic properties of manganese substituted Ni-Zn ferrites

B. PARVATHEESWARA RAO1,2, CHONG-OH KIM2,* , CHEOL-GI KIM2, O. F. CALTUN3

Affiliation

  1. Department of Physics, Andhra University, Visakhapatnam 530003, India
  2. Deapartment of Materials Engineering, Chungnam National University, Daejeon, Korea
  3. Faculty of Physics, A.I. Cuza University, Iasi, 700506, Romania

Abstract

Ni0.35 Zn0.65-x Mnx Fe2 O4 ferrite system with x varies from 0.00 to 0.25 in steps of 0.05 has been prepared by conventional ceramic technique. The samples were sintered at 1250 °C for 4 hours in air atmosphere followed by natural cooling. X-ray diffraction patterns of all the samples exhibit all the major peaks concerned to the cubic spinel structure. Lattice constants were estimated using high angle x-ray peaks. The variation of lattice constant with manganese concentration follows the similar trend as that of percent porosity. Though the manganese ions with 5 μB are substituted in place of non-magnetic zinc ions, the saturation magnetization of the system is recorded a continuous increase through out the range of substitutions. Curie temperature of the system is also found to increase from 266 oC (x=0.00) to 372 oC (x=0.25) with the increase in manganese content. Smooth coercivity variation suggests better structural homogeneity. The results are discussed in light of the distribution of magnetic cations..

Keywords

Magnetic properties, NiZn ferrites, Manganese substitution, Lattice constant, Porosity.

Submitted at: Jan. 25, 2007
Accepted at: April 15, 2007

Citation

B. PARVATHEESWARA RAO, CHONG-OH KIM, CHEOL-GI KIM, O. F. CALTUN, X-ray and magnetic properties of manganese substituted Ni-Zn ferrites, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 4, pp. 1143-1146 (2007)