ic7019439_si_003.cif (18.21 kB)
Cation Substitution Effects in the System Sr2−xBaxBi3 (0 ≤ x ≤ 1.3): Structural Distortions Induced by Chemical Pressure
Version 2 2016-06-03, 22:21
Version 1 2016-02-27, 14:08
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posted on 2008-05-05, 00:00 authored by Sung-Jin Kim, Simeon Ponou, Thomas F. FässlerCrystals of the composition Sr2-xBaxBi3 (0 ≤ x ≤ 1.3) have been synthesized from the elements and were characterized by single-crystal and powder X-ray diffraction methods. The compounds crystallize for x = 0, 0.45, 0.86, 1.08, 1.28 in the structure type of the parent compound Sr2Bi3 with space group Pnna (No. 52) and Z = 4. Substitution of Sr by Ba leads to a site preference for Ba. The anionic Bi substructures in the pseudoternary system simultaneously distort under remarkable elongation of one distinct Bi−Bi contact. Magnetic measurements for samples with x = 0, 0.45 and 1.08 reveal superconducting transitions at low temperatures. Linear muffin-tin orbital band structure calculations of Sr2Bi3 show strong cation–anion interactions that greatly stabilize the structure. Besides showing characteristics of a typical metal, the band structure plot unveils the coinstantaneous occurrence of flat and steep bands around the Fermi level indicative for superconductivity.
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Baband structure calculationsMagnetic measurementsband structure plotsuperconducting transitionsFermi levelBi substructuresSr 2 Bi 3 showpseudoternary systemChemical Pressure Crystalssite preferencecoinstantaneous occurrence4. SubstitutionCation Substitution Effectsstructure typespace group Pnnaparent compound Sr 2 Bi 3
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