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Microstructure and Magnetic Properties of Ni‐Mg‐Zn‐Co Ferrites
Author(s) -
Patil Sarjerao B.,
Davari Anil J.,
Patil Devidas R.,
Patil Rajendra P.
Publication year - 2020
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.202000179
Subject(s) - curie temperature , spinel , analytical chemistry (journal) , materials science , microstructure , lattice constant , saturation (graph theory) , magnetic moment , grain size , crystallography , diffraction , chemistry , ferromagnetism , condensed matter physics , metallurgy , physics , mathematics , chromatography , combinatorics , optics
Preparation of Ni‐Mg‐Zn‐Co ferrites having general formula Ni 0.5‐ x Mg x‐0.01 Zn 0.5‐ y Co y+0.01 Fe 2 O 4 (where x = 0.1, 0.2, 0.3, 0.4 and y = 0.1, 0.2, 0.3, 0.4) is carried out by conventional ceramic method. The X‐ray diffraction studies of compositions reveal the formation of single‐phase cubic spinel. The lattice parameter “a,” bond lengths R A , R B , and site radii r A , r B are found to increase linearly with increase in Zn content. The average grain diameter determined from scanning electron microscopy studies is found to increase with Ni content. The magnetic moment ( μ B ) increases on addition of Zn. However, it decreases beyond Zn = 0.4. The lower values of hc and Mr/Ms show the existence of MD particles in the samples. The value of μ B lie in the range of 0.85 to 1.09 and saturation magnetization (4πMs) varies between 834 and 1115 emu g ‐1 . It is observed that μ B and Ms increase with Zn content upto Zn = 0.3 and then decrease. The cation distribution is proposed on the basis of site preference energies of the ions. Initial permeability increases slowly to the peak value at a certain temperature and drops abruptly to zero at the Curie temperature. The Curie temperature is found to decrease with increase in Zn content.