- Rietveld X-ray powder analysis of InBi crystalline structure at low temperatures
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The dependence of the InBi crystalline structure on temperature (between 300 and 15 K) has been refined by the Rietveld method from X-ray powder diffraction data. The ranges of the lattice parameters (a and c) and the free parameter of the Bi atom (z) in the above temperature range are 5.0101(3)-4.9589(3) angstroms, 4.7824(3)-4.8396(3) angstroms and 0.3993(7)-0.3918(7) respectively.
- Kubiak,Janczak
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- Crystal structure of InBi under pressure up to 75 GPa
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InBi is studied by energy-dispersive diffraction with synchrotron radiation in a diamond-anvil cell under pressure up to 75 GPa. Three phase transitions are observed from its initial tetragonal structure tP4 with c/a≈0.95 to another tP4 structure with c/a≈0.65 typical for the β-Np structure, than to a disordered tetragonal body-centered structure tI2, and finally some hints are obtained for a transition to a cubic body-centered structure cI2. All these transformations are reversible with large hysteresis. InBi(tI2), phase III, shows initially a steep increase in c/a from 0.91 to 0.94, in the pressure range from 20 to 30 GPa, and a nearly constant value of about 0.96 above 55 GPa. Hints for the possible stability of a new phase IV are noticed in the present experiments on decompression from 75 GPa as admixture of new lines to phase III giving strong indications for a first-order phase transition with large hysteresis. The origin of the tetragonal distortion and the transformation to a cubic phase are discussed from the point of view of nesting the Fermi sphere in the Brillouin zone.
- Degtyareva,Winzenick,Holzapfel
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- Superconductivity and crystallographic transitions of InBi under pressure
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Measurements of the superconducting transition temperature Tc of the compound InBi under pressures up to 40 GPa reveal three different regions corresponding to the observed structural transitions I-II-III from the initial phase I of InBi type (t P4) to phase II of β-Np type (t P4) and to a body-centred tetragonal phase III (t 12). Some similarities and distinct differences in the superconducting and structural behaviour of the III-V compound InBi in comparison with the isoelectronic group IV element Sn point to some differences in the possible mechanisms for the crystallographic transformations under pressure.
- Tissen,Degtyareva,Nefedova,Ponyatovskii,Holzapfel
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- Supercooling of In2Bi and InBi melts
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The effect of melt overheating ΔT+ on the critical supercooling ΔT- of liquid In2Bi and InBi is studied by cyclic thermal analysis. It is shown that, the ΔT- for In2Bi is ?2.0 K, independent of the me
- Aleksandrov,Frolova
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p. 227 - 230
(2008/10/09)
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