Abstract
BaSn0.7Sb0.3O3 has been synthesized for the first time. This result is original because up to now the solubility limit of the Ba(Sn1−xSbx)O3 series was found to be x=0.2. The electronic carrier concentration is prevented from screening phonons via infrared reflectivity spectra. Whereas a transition from metal to superconductor behaviour is observed upon substituting Pb for Bi in the perovskite Ba(Pb,Bi)O3 system, no similar transition was observed in the Ba(Sn,Sb)O3 system, although these systems have the same structure. The phenomen of 3+/5+ disproportionation exists in both systems. The octahedra are occupied by cations exhibiting the same valence. The electronic carrier concentration is similar but superconductivity is not observed in the Ba(Sn,Sb)O3 system. The correlation between metallicity and structure is studied.
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