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Nonstoichiometry in B8‐Type NiSb
Author(s) -
Leubolt Robert,
Ipser Herbert,
Terzieff Peter,
Komarek Kurt L.
Publication year - 1986
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19865330226
Subject(s) - nickel , antimony , octahedron , phase diagram , stoichiometry , lattice (music) , crystallography , melting point , phase boundary , chemistry , materials science , phase (matter) , condensed matter physics , crystal structure , inorganic chemistry , metallurgy , physics , organic chemistry , acoustics
The phase diagram of the nickel‐antimony system has been investigated between 40 and 54 at% Sb. The congruent melting point of γ‐NiSb (with NiAs‐structure) was found at 47 at% Sb and 1432 ± 5 K. Lattice parameters and pycnometric density of this phase were determined as a function of composition; both exhibit a change of slope between 50 and 51 at% Sb rather than exactly at the stoichiometric composition. In the same concentration range a flat minimum was also found in the composition dependence of the magnetic susceptibility measured at room temperature. These effects are explained by the following defect mechanism: Starting at the antimonyrich phase boundary nickel atoms will at first occupy octahedral sites. However, before these sites are completely filled, nickel atoms will start to fill the trigonal‐bipyramidal holes (interstitial sites) of the NiAs‐lattice.