12688-64-1Relevant articles and documents
The crystal structure of BiNi: A complex superstructure of the InNi2 structure type
Ruck, Michael
, p. 2050 - 2054 (1999)
Chemical transport reactions using bromine or iodine yielded crystals of BiNi with a largely ordered distribution of nickel atoms on octahedral and trigonal bipyramidal interstices within the hexagonal packing of bismuth atoms. The observed superstructure of the NiAs or InNi2 structure types is described in the monoclinic space group F 1 2/m 1 (No. 12) with lattice parameters a = 1412.4(1), b = 816.21(6), c = 2142.9(2) pm, and β = 90°. The pseudo-orthorhombic cell facilitates twinning along [100]. Some crystals show an additional threefold twinning along [001]. The phase width of BiNi ranges from the nickel poor to the nickel rich region. In the vicinity of the stoichiometric composition BiNi, this has only an effect on the occupation of a single nickel position in the crystal structure.
Conversion Reactions of Solids: From a Surprising Three-Step Mechanism towards Directed Product Formation
Rommel, Stefan Michael,Krach, Alexander,Peter, Philipp,Weihrich, Richard
, p. 6333 - 6339 (2016)
Directed conversion reactions from binary to multinary compounds are discovered from the reaction of Bi2S3 and Bi2Se3 with NiCl2·6 H2O in polyol media under basic conditions. Control of the synthesis conditions allows the preparation of NiBiSe and superconducting Ni3Bi2S2 and Ni3Bi2Se2. The formation of Ni3Bi2S2 from Bi2S3 is found from an unexpected three-step reaction path with Bi and NiBi as intermediates. In the more complex Ni/Bi/Se system, the mechanism found can be used to selectively direct the reaction between the competing ternaries and to suppress side-product formation. Contrary to solid-state reactions (500-900 °C) control of product formation is reached at reaction temperatures and times between 166-300 °C and 0.5-10 h, respectively. The formation of different phases is discussed from results of DFT calculations.
Synthesis and characterization of Bi nanorods and superconducting NiBi particles
Park, Sangmoon,Kang, Kyongha,Han, Weiqiang,Vogt, Thomas
, p. 88 - 91 (2005)
Bi nanorods and NiBi particles were prepared using a simple hydrothermal reduction method at moderate temperatures of 150 °C. Transmission electron microscopy (TEM) reveals pure Bi nanorods with diameters of about 50 nm and superconducting NiBi particles. The magnetic susceptibility (χ) of the superconducting NiBi was measured as a function of temperature at 10 Oe.
Refinement of the Microwave-Assisted Polyol Process for the Low-Temperature Synthesis of Intermetallic Nanoparticles
Teichert, Johannes,Heise, Martin,Chang, Jen-Hui,Ruck, Michael
supporting information, p. 4930 - 4938 (2017/11/21)
The microwave-assisted polyol process was applied to synthesize phase-pure micro- or nanocrystalline intermetallic phases in the systems T–M (T = Co, Ni, Rh, Pd, Ir, Pt and M = Sn, Sb, Pb, Bi). Reaction temperatures range between 240 and 300 °C, and reaction times of a few minutes up to 1 h are sufficient. For optimization of the syntheses, the reaction temperature, reaction time, and metal precursors were changed. To obtain phase-pure samples the process was further modified by the addition of potassium hydroxide, oleylamine, or oleic acid. Single-phase powders of a variety of intermetallic compounds were synthesized. Although not stable at the temperature of synthesis, high-temperature phases are accessible as well. The microwave-assisted polyol process opens up the possibility to synthesize intermetallic compounds through a fast and easily applicable one-step route, without utilization of strong and often toxic reducing agents.
Y-Ni-Bi and Ho-Ni-Bi Systems
Mozharivskii,Kuz'ma,Sichevich
, p. 707 - 710 (2008/10/08)
The 723-K sections of the Y-Ni-Bi and Ho-Ni-Bi phase diagrams are studied by x-ray diffraction. The compounds HoNiBi, Y5Ni2Bi, Ho5Ni2Bi, ～Y67Ni38Bi5, ～Y5NiBi2, and ～Ho5NiBi2 are identified for the first time. Crystallographic data for these ternary compounds are presented.
