The Effect of Magnesium Substitution and Sintering Temperature on the Structural and Magnetic Properties of Manganese- Magnesium Ferrite

• Main Authors: S.T. Mohammadi Benehi, S. Manouchehri, M.H. Yousefi
• Format: Article
• Language: fas
• Published: Isfahan University of Technology 2016-12-01
• Series: Journal of Advanced Materials in Engineering
• Subjects: Nanopowder; Mn-Mg ferrite; Coprecipitation method; Sintering temperature; Magnetic properties
• Online Access: http://jame.iut.ac.ir/browse.php?a_code=A-10-1-717&slc_lang=en&sid=1

Magnesium-manganese ferrite nanopowders (MgxMn1-xFe2O4, x=0.0 up to 1 with step 0.2) were prepared by coprecipitation method. The as-prepared samples were pressed with hydrolic press to form a pellet and were sintered in 900, 1050 and 1250˚C. Scanning Tunneling Microscope (STM) images showed the particle size of powders about 17 nm. The X-ray patterns confirmed the formation of cubic single phase spinel structure in samples sintered at 1250˚C. Substituting Mg2+ with Mn2+ in these samples, the lattice parameter decreased from 8.49 to 8.35Å and magnetization saturation decreased from 74.7 to 21.2emu/g. Also, coercity (HC ) increased from 5 to 23Oe and Curie temperature (TC ) increased from 269 to 392˚C. Samples with x= 0.2, 0.4, 0.6 sintered at 1250 ˚C, because of their magnetic properties, can be recommended for hyperthermia applications and for phase shifters.