Synthesis of maghemite sub-microspheres by simple solvothermal reduction method

✍ Scribed by Xian-Ming Liu; Shao-Yun Fu; Hong-Mei Xiao

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 229 KB
• Volume: 179
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1016/j.jssc.2006.02.003

✦ Synopsis

Maghemite sub-micrometer-sized spheres were successfully prepared by a simple solvothermal reduction route at relatively low temperature. The as-obtained sample was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), electron diffraction (ED), X-ray photoelectron spectroscopy (XPS) and superconducting quantum interference device (SQUID) measurements. XRD and XPS analyses indicate the formation of g-Fe 2 O 3 phase. TEM results reveal that the g-Fe 2 O 3 particles are spherical with the diameter of 200-400 nm. Magnetic measurements show that the Curie temperature of g-Fe 2 O 3 sub-microspheres is over 400 K and the sample exhibits ferromagnetic behavior at room temperature. It is found that the sub-microspheres possess high saturation magnetization of 81 emu/g at 300 K.