X-ray absorption fine structure analysis of Mn1-xCoxFe2O4 nanoparticles prepared by hydrothermal method

作者：Wiriya Narinthorn^*; Bootchanont Atipong; Maensiri Santi; Swatsitang Ekaphan

来源：Japanese Journal of Applied Physics, 2014, 53(6): 06JF09.

DOI：10.7567/JJAP.53.06JF09

Mn1-xCoxFe2O4 nanoparticles (x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0) were prepared by a hydrothermal method. The structure of samples was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and trans mission electron microscopy (TEM) and found to be an inverse spinel with a crystallite size in the range of 9-15 nm. The magnetic properties measured by vibration sample magnetometry (VSM) indicated that all samples were ferromagnetic with magnetization (M) at 10 kOe and coercivity in the ranges of 15-42 emu/g and 39-372 Oe, respectively. The oxidation states of Mn and Co cations in doped samples as analyzed by X-ray absorption fine structure (XANES) were found to be +3 and +2, respectively. Mn3+ and Co2+ cations were found at both tetrahedral and octahedral sites with a strong preference to be at the tetrahedral and octahedral sites, respectively. Fe2+ and Fe3+ cations were found to occupy both tetrahedral and octahedral sites with a higher stronger preference to be at the tetrahedral site.

• 出版日期2014-6