Wet-chemical synthesis and characterization of NiBi nano- and micro-particles by I. M. Odeh, S. Mahmoud, and G. P. Vassilev

Crystal Research and Technology

Cryst. Res. Technol. 43, 537 (2008) - Abstract -

Wet-chemical synthesis and characterization of NiBi nano- and micro-particles

I. M. Odeh, S. Mahmoud*, and G. P. Vassilev**

Yarmouk University, Physics Department, Irbid, Jordan
*Yarmouk University, Chemistry Department, Irbid, Jordan
**University of Plovdiv, Faculty of Chemistry, Plovdiv, Bulgaria

Keywords	transition metal alloys and compounds, X-ray diffraction, Ni–Bi intermediate phases
PACS	81.05.Bx, 81.07.Wx, 81.16.Be
DOI	10.1002/crat.200711079

Preparation and characterization of NiBi nano- and micro-particles are presented. Firstly, predetermined compositions were obtained by simultaneous precipitation from solutions of Bi(NO₃)₃ and Ni(NO₃)₂. The precipitates were heated under oxygen flow and in air, and thereafter reduced to metals under hydrogen flow at 673 K. Correlation between the predetermined and the actual compositions of the products was found. Characterization of the precipitates was carried out employing X-ray diffraction, scanning and transmission electron microscopy. Nickel-bismuth intermetallic phase (NiBi) particles with nano- and micro-dimensions were observed in the samples after reduction. The other possible Ni–Bi intermediate phase (NiBi₃) did not form at these conditions although its presence was expected according to the phase diagram. This finding might be useful for the implementation of Bi-based solders where the growth of the compound NiBi₃ in the solder joints must be prevented.

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