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Title: Crystallographic and magnetic properties of the spinel-type ferrites Zn{sub x}Co{sub 1-x}Fe{sub 2}O{sub 4} (0.0 ≤ x ≤ 0.75)

Ultrahigh frequencies (UHF) have applications in signal and power electronics to minimize product sizes, increase production quantity and lower manufacturing cost. In the UHF range of 300 MHz to 3 GHz, ferrimagnetic iron oxides (ferrites) are especially useful because they combine the properties of a magnetic material with that of an electrical insulator. Ferrites have much higher electrical resistivity than metallic ferromagnetic materials, resulting in minimization of the eddy current losses, and total penetration of the electromagnetic (EM) field. Hence ferrites are frequently applied as circuit elements, magnetic storage media like read/write heads, phase shifters and Faraday rotators. The electromagnetic properties of ferrites are affected by operating conditions such as field strength, temperature and frequency. The spinel system Zn{sub x}Co{sub 1-x}Fe{sub 2}O{sub 4} (x=0.0, 0.25, 0.50 and 0.75) has been prepared by the standard solid state sintering method. X-ray and neutron powder diffraction measurements were performed at room temperature. Neutron diffraction data analysis confirms the cubic symmetry corresponding to the space group Fd3m. The distribution of three cations Zn{sup 2+}, Co{sup 2+} and Fe{sup 3+} over the spinel lattice and other crystallographic parameters like lattice constant, oxygen position parameter, overall temperature factor and occupancies of different ions in different lattice sites formore » the samples have been determined from the analysis of neutron diffraction data. The lattice constant increases with increasing Zn content in the system. The magnetic structure was found to be ferrimagnetic for the samples with x≤0.50. Magnetization measurements show that with the increase of Zn content in the system the value of saturation magnetization first increases and then decreases. The variation of the magnetic moment with Zn substitution has been discussed in terms of the distribution of magnetic and non-magnetic ions over the A and B sub-lattices and their exchange coupling.« less
Authors:
 [1] ; ; ; ;  [2] ; ;  [3] ;  [4]
  1. Faculty of Integrated Technologies, Universiti Brunei Darussalam, Gadong BE 1410 (Brunei Darussalam)
  2. Institute of Nuclear Science and Technology, Bangladesh Atomic Energy Commission, Savar, Dhaka (Bangladesh)
  3. Department of Physics, Jahangirnagar University, Savar, Dhaka (Bangladesh)
  4. Department of Chemical & Biological Engineering, Chalmers University of Technology, Gothenburg (Sweden)
Publication Date:
OSTI Identifier:
22490175
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1660; Journal Issue: 1; Conference: ICoMEIA 2014: International conference on mathematics, engineering and industrial applications 2014, Penang (Malaysia), 28-30 May 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COBALT COMPOUNDS; COBALT IONS; CUBIC LATTICES; EDDY CURRENTS; ELECTRIC CONDUCTIVITY; ELECTRICAL INSULATORS; FERRITES; FERROMAGNETIC MATERIALS; IRON IONS; IRON OXIDES; LATTICE PARAMETERS; MAGNETIC PROPERTIES; MAGNETIZATION; MHZ RANGE; NEUTRON DIFFRACTION; PHASE SHIFT; SINTERING; ZINC COMPOUNDS; ZINC IONS