CeO2 nano-octahedrons have been successfully synthesized by a facile one-step hydrothermal method.
The influences of reaction time on the morphologies, crystal structures, and magnetic properties of the
resulting products have been investigated. It is found that morphology is dependent on reaction time.
Regular CeO2 nano-octahedrons synthesized at 190 1C exhibit weak but unambiguous room-temperature
ferromagnetism (RTFM). However, irregular CeO2 nano-octahedrons synthesized at 250 1C exhibit a
stronger RTFM. The enhanced ferromagnetism can be attributed to the effects of the oxygen vacancies
and defects from the smaller crystallite sizes.