Dhaka University Journal of Applied Science & Engineering

• I. B. Elius
  Institute of Nuclear Science and Technology, Bangladesh Atomic Energy Commission, GPO Box No.3787, Dhaka-1000 Bangladesh
• A. K. M. Zakaria
  Institute of Nuclear Science and Technology, Bangladesh Atomic Energy Commission, GPO Box No.3787, Dhaka-1000 Bangladesh, Bangladesh Atomic Energy Commission, Agargaon, Dhaka-1207
• J. Maudood
  Institute of Nuclear Science and Technology, Bangladesh Atomic Energy Commission, GPO Box No.3787, Dhaka-1000 Bangladesh
• , S. Hossain
  Institute of Nuclear Science and Technology, Bangladesh Atomic Energy Commission, GPO Box No.3787, Dhaka-1000 Bangladesh
• M. M. Islam
  Department of Applied Chemistry and Chemical Engineering, University of Dhaka, Dhaka-1000
• A. Nahar
  Materials Science Division, Atomic Energy Centre, Dhaka-1000
• Md Sazzad Hossain
  4Department of Physics, University of Dhaka, Dhaka-1000
• I. Kamal
  Bangladesh Atomic Energy Commission, Agargaon, Dhaka-1207

Manganese ferrite (MnFe₂O₄) and copper doped manganese ferrite  (Mn_0.75Cu_0.25Fe₂O₄) soft materials were synthesized through solid-state sintering method. The phase purity and quality were confirmed from x-ray diffraction patterns. Then the samples were subjected to neutron diffraction experiment and the diffraction data were analyzed using FullProf software package. The surface morphology of the soft material samples was studied using a scanning electron microscope (SEM). Crystal parameters, crystallite parameters, occupancy at A and B sites of the spinel structure, magnetic moments of the atoms at various locations, symmetries, oxygen position parameters, bond lengths etc. were measured and compared with the reference data. In MnFe₂O₄, both octahedral (A) and tetrahedral (B) positions are shared by Mn²⁺ and Fe^2+/3+ cations, here A site is predominantly occupied by Fe²⁺ and B site is occupied by Mn at 0.825 occupancy. The Cu²⁺ ions in Cu_0.25Mn_0.75Fe₂O₄ mostly occupy the B site. Copper mostly occupy the octahedral (16d) sites. The length of the cubic lattice decreases with the increasing copper content. The magnetic properties, i.e. A or B site magnetic moments, net magnetic moment etc. were measured using neutron diffraction analysis and compared with the bulk magnetic properties measured with VSM studies.

1. Goodarz, M., and E. B., 2012, “Crystalization in Spinel Ferrite Nanoparticles”, In Advances in Crystallization Processes. InTech, pp 341–380.