Doping assisted structural transition in copper substituted MgFe2O4 ferrite: Thermal, electrical and magnetic properties

作者：Singhal S^*; Namgyal T; Laxhmi N; Bansal S

来源：Scientia Iranica, 2013, 20(6): 2323-2331.

• Ferrites
• X-ray diffraction
• Electrical properties
• Saturation magnetization
• Coercivity

A cubic to tetragonal structure transition has evolved by substitution of Cu2+ ions in magnesium ferrite, fabricated via the sol-gel method. TEM studies revealed quasi-spherical particles for MgFe2O4 and rod-shaped particles for CuFe2O4, suggesting an enhancement of morphological anisotropy with Cu doping. Thermal analysis shows the formation of MgFe2O4 and CuFe2O4 at similar to 380 degrees C and similar to 340 degrees C, respectively, indicating a reduction in temperature for the formation of samples with copper doping. XRD shows the structural transition from a cubic to a tetragonal structure with increasing copper concentration. The dc electrical resistivity decreases with copper doping in MgFe2O4, attributing to the increase in conductivity due to Cu2+-Cu+ ions hopping. MgFe2O4 has been found to have a saturation magnetization of similar to 23 emu/g and a coercive field of similar to 54 Oe. The saturation magnetization increases, while coercivity initially decreases and then increases with increasing copper concentration.

• 出版日期2013-12