Sinterability, physico-mechanical, electrical and magnetic properties of CoxMg1-xAl2O4 synthesized by microwave combustion method

• Published in: Ceramics international 2018-12, Vol.44 (17), p.21525-21529
• Main Authors: Khattab, R.M., Sadek, H.E.H., Gaber, A.A., Zawrah, M.F.
• Format: Article
• Language: English
• Subjects: Co-spinel; Electrical properties; Magnetic; Physic-mechanical; Sintering, Microwave
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2018.08.214

The aim of this work is to study the influence of cobalt content on the properties of sintered CoxMg1-xAl2O4 (x = 0–1) spinel synthesized by microwave combustion technique. To optimize the suitable sintering temperature for getting sintered spinel with improved properties, the sinterability was investigated at 1400, 1500 and 1600 °C. Phase composition of sintered spinel was examined by x-ray analysis while bulk density and apparent porosity were determined by water displacement method according to Archimedes principle. Microstructure of spinel sintered at 1600 °C was investigated by scanning electron microscope. Moreover, compressive strength, electrical conductivity, electrical resistivity and magnetic properties of sintered spinel materials were also measured. The results revealed that an improvement in physical, mechanical, electrical and magnetic properties of spinel sintered at 1600 °C was achieved. Co0.2Mg0.8Al2O4 specimen exhibited lower porosity and higher compressive strength as well as higher electrical conductivity among other sintered compositions. The saturation magnetization was increased with increasing the cobalt content in spinel.