Synthesis and Properties of a New Metal-Rich Nickel Antimonide Telluride or Selenide: Ni 7 - δ SbX 2 (δ ≈ 1.3; X = Se or Te)
2002; American Chemical Society; Volume: 14; Issue: 11 Linguagem: Inglês
10.1021/cm020585r
ISSN1520-5002
AutoresThomas K. Reynolds, Joshua G. Bales, Francis J. DiSalvo,
Tópico(s)Advanced Thermoelectric Materials and Devices
ResumoThe two isotypic compounds Ni5.66SbTe2 and Ni5.72SbSe2 have been synthesized by high-temperature reaction of the elements or by using a flux method. They were both characterized by single-crystal X-ray diffraction. Both compounds crystallize in space group I4/mmm with Z = 2. Ni5.66SbTe2 (Ni5.72SbSe2) has lattice parameters a = b = 3.7824(5) Å and c = 19.244(4) Å (a = b = 3.7021(5) Å and c = 18.593(3) Å). There is a high concentration of nickel vacancies (≈66%) on one of the three nickel sites (Wyckoff position 4e). Thermopower, thermal conductivity, resistivity, and magnetic susceptibility data for Ni5.66SbTe2 indicate nonmagnetic and metallic behavior.
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