期刊名称:Karbala International Journal of Modern Science
印刷版ISSN:2405-609X
电子版ISSN:2405-609X
出版年度:2018
卷号:4
期号:1
页码:143-150
DOI:10.1016/j.kijoms.2018.01.001
语种:English
出版社:Elsevier
摘要:AbstractSamarium and bismuth are doped in lower concentration in Ni0.7Co0.3Fe2−xRxO4(x = 0, 0.02, 0.04, 0.06) (R = Sm or Bi) and are prepared using ceramic route and sintered at 1150 °C for 4 h. X-ray diffraction confirms the cubic structure without any distortion for higher ionic radii ions in the spinel structure. High strain is observed for Ni0.7Co0.3Fe1.98Bi0.02O4among investigated samples. Field-emission scanning electron microscope (FE-SEM) confirms the doping of bismuth and samarium in expected ratio for Rx–Ni–Co ferrites. Low concentration doping effects were characterized using spectroscopic techniques, by which four primary bands were noted from Fourier transform infrared (FTIR) and Raman spectroscopy. Saturation magnetization decreases for lower concentrated ions, substituted in Ni–Co ferrites, saturation magnetization shows increase in higher concentration, attributing to changes that occur due to exchange interactions. Coercivity increases with the increase in samarium but decreases with bismuth substitution.