Sonochemical Synthesis of Nanocrystalline Rare Earth Orthoferrites Using Fe(CO)₅ Precursor

Abstract

This paper describes, for the first time, a simple sonochemical method for the synthesis of nanoparticles of a series of rare earth orthoferrites. This sonochemical process is enabling synthesis of nanoparticles of the rare earth orthoferrites at a substantially lower calcination temperature by using simple precursors, iron pentacarbonyl and rare earth carbonates. It is particularly noteworthy that the cogeneration of the garnet phase has not been observed, as is usual with the conventional methods. The drastic reduction in the calcination temperature could be due to the ultrasonic generation of amorphous iron oxide from Fe(CO)5. Nanosized GdFeO3, ErFeO3, TbFeO3, and EuFeO3 were prepared by this method and their magnetic properties were also studied in detail.

Formation of Oxide Phases in the System Pr-Fe-O

“…Sivakumar et al 2 prepared nanocrystalline orthoferrites GdFeO 3 , ErFeO 3 , TbFeO 3 and EuFeO 3 starting from Fe(CO) 5 and corresponding RE-carbonate with the aid of sonochemistry. The orthoferrite precursors were then calcined between 800 and 910 °C for 24 h in air atmosphere.…”

Electrical and magnetic properties of spherical SmFeO 3 synthesized by aspartic acid assisted combustion method

“…The XRD pattern of SmFeO 3 (Figure 1 [22][23]. Hence, the FTIR spectrum also confirms the phase purity of the SmFeO 3 .…”

Spin dependent electrical abnormal in TbFeO3

“…The spectrum shows well-established strong absorption bands around ∼561 cm −1 and ∼436 cm −1 . The existence of a band around 561 cm −1 strongly suggests the Fe-O I stretching vibration (␥ 1 mode), and the 436 cm −1 band corresponds to the O II -Fe-O II deformation vibration (␥ 2 mode) [17,18].…”