Solid state synthesis and room temperature magnetic properties of iron phosphide nanoparticles |
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Authors: | N. Singh P. K. Khanna P. A. Joy |
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Affiliation: | (1) Nanoscience Group, Centre for Materials for Electronics Technology (C-MET), Panchwati, Off Pashan Road, Pune, 411 008, India;(2) Physical Chemistry Division, National Chemical Laboratory, Pashan Road, Pune, 411 008, India |
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Abstract: | Room temperature magnetic properties have been achieved for nano-crystalline iron phosphide synthesized from the direct solid state reaction of iron chloride and tri-octylphosphine (TOP). The magnetization continuously increased with higher magnetic fields, indicating a super-paramagnetic behavior. It is observed that room temperature magnetism is possible for the material showing antiferromagnetic nature at low temperatures. In the present synthesis, TOP acted as a source of phosphorus as well as a surfactant. X-ray diffraction (XRD) studies revealed that the black powder is a mixture of FeP and Fe2P. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) showed elongated as well spherical particles. Energy dispersion X-ray analysis (EDAX) confirmed a non-stoichiometric iron phosphide. Presence of TOP was confirmed by infra-red (IR) spectroscopy, and thermo-gravimetric analysis (TGA) indicated about 6% wt. loss due to presence of organics. |
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Keywords: | Iron phosphide Synthesis Solid state reaction XRD Semiconductors |
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