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Wet‐chemical synthesis and characterization of NiBi nano‐ and micro‐particles
Author(s) -
Odeh I. M.,
Mahmoud S.,
Vassilev G. P.
Publication year - 2008
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200711079
Subject(s) - intermetallic , characterization (materials science) , transmission electron microscopy , scanning electron microscope , materials science , precipitation , nickel , nano , bismuth , phase (matter) , chemical engineering , soldering , phase diagram , analytical chemistry (journal) , metallurgy , nanotechnology , chemistry , composite material , chromatography , physics , organic chemistry , alloy , meteorology , engineering
Abstract Preparation and characterization of NiBi nano‐ and micro‐particles are presented. Firstly, predetermined compositions were obtained by simultaneous precipitation from solutions of Bi(NO 3 ) 3 and Ni(NO 3 ) 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 (NiBi 3 ) 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 NiBi 3 in the solder joints must be prevented. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)