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Title: Structure, conductivity and magnetic study of Sr2Zn2Al2Fe10O22 ferrite
Authors: Salunkhe, M Y
Lanje, N Y
Kulkarni, D K
Issue Date: Apr-2002
Publisher: NISCAIR-CSIR, India
Abstract: Zinc substituted strontium Y type hard ferrite with the chemical formula Sr2Zn2Al2Fe10O22is prepared using AR grade reactants in the proper stoichiometric proportions by solid state reaction at 850°C. The XRD pattern of the compound showed a presence of single crystalline phase having a hexagonal structure with lattice parameter a = 5.614 Ǻ and c = 53 .736 Ǻ. Magnetic susceptibility is measured between room temperature and 950 K by Gouy's method. These measurements showed ferromagnetic nature of the compound up to 896 K and then it becomes paramagnetic. The observed high value of Curie temperature is due to high percentage of Fe+3 ions. The Curie molar constant is also calculated. Electrical conductivity measurements showed slight deviation from linearity near the Curie temperature. The energy of activation is found to be 0.99 eV. Variation of dielectric constant with temperature at constant frequency of 50 Hz was determined by using digital LCR meter. The ferro to para electrical transition temperature Tc, was found to be 301 K, close to room temperature. It is interesting to note here that the seasonal changes will heavily influence the room temperature behaviour. The observed results follow the well-known Curie-Weiss law for the dielectrics.
Page(s): 301-303
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.40(04) [April 2002]

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