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Sökning: WFRF:(Akselrud Lev)

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1.
  • Akselrud, Lev, et al. (författare)
  • Order and disorder in the modulated phase hp-Mg9Ge5.1
  • 2022
  • Ingår i: Zeitschrift fur Anorganische und Allgemeine Chemie. - : Wiley. - 0044-2313 .- 1521-3749. ; 648:10
  • Tidskriftsartikel (refereegranskat)abstract
    • Single crystals of Mg9Ge5.1(2) were obtained at a pressure of 5 GPa in the temperature range 723 to 1273 K. The metastable high-pressure phase exhibits a crystal structure, which may be described as a host-guest variety of an UCl3-type framework. The atomic arrangement is characterized by a host crystal structure Mg9Ge3 with disordered germanium guests (≈2 Ge per formula unit) in the channels. The composite arrangement undergoes incommensurate modulation. Upon heating at ambient pressure, the phase transforms into the thermodynamically stable compounds Mg2Ge and Ge at 496(5) K. Measurements of the magnetic susceptibility indicate diamagnetic behavior between 75 and 350 K.
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2.
  • Pavlyuk, Volodymyr, et al. (författare)
  • LiZn4 - x (x = 0.825) as a (3 + 1)-dimensional modulated derivative of hexagonal close packing.
  • 2014
  • Ingår i: Acta Crystallographica. Section B: Structural Science, Crystal Engineering and Materials. - 2052-5206. ; 70:Pt 2, s. 212-217
  • Tidskriftsartikel (refereegranskat)abstract
    • The (3+1)-dimensional modulated structure of the LiZn4 - x (x = 0.825) binary compound has been determined in the superspace. The compound crystallizes in the orthorhombic superspace group Cmcm(α00)0s0 with a = 2.7680 (6), b = 4.7942 (6), c = 4.3864 (9) Å, modulation wavevector: q ≃ 4/7a*. The structure is a derivative from the hexagonal close packing. The cubo-octahedron as a coordination polyhedron (c.n. = 12) is typical for all atoms. Bonding between atoms is explored by means of the TB-LMTO-ASA program package. The absence of strong interatomic interactions in LiZn4 - x is the main reason for the possible structure transformations.
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