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Bismuthates: BaBiO₃ and related superconducting phases Public Deposited

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  • BaBiO₃ has the perovskite structure, but tilting of the BiO₆ octahedra destroy the ideal cubic symmetry except at temperatures above 820 K. BaBiO₃ is a diamagnetic semiconductor due to a charge density wave (CDW), which is equivalent to a Ba₂Bi³⁺Bi⁵⁺O₆ representation. Recent calculations and experimental results confirm that there is no significant deviation from the oxidation states of 3+ and 5+. Superconductivity with a T[subscript c] as high as 13 K occurs for BaPb₁₋ₓBiₓO₃ phases where the 6s band is about 25% filled, and superconductivity with a T[subscript c] as high as 34 K occurs for Ba₁₋ₓKₓBiO₃ phases where the 6s band is about 35% filled. Structures in these two solid solutions can have cubic, tetragonal, orthorhombic, or monoclinic symmetry. However, superconductivity has only been observed when the symmetry is tetragonal.
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  • Sleight, A. W. (2015). Bismuthates: BaBiO₃ and related superconducting phases. Physica C: Superconductivity and its Applications, 514, 152-165. doi:10.1016/j.physc.2015.02.012
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  • description.provenance : Submitted by Deanne Bruner (deanne.bruner@oregonstate.edu) on 2015-11-24T01:27:34Z No. of bitstreams: 2 SleightArthurChemistryBismuthatesBaBiO3RelatedSuperconductingPhases.pdf: 2224703 bytes, checksum: 0ee83de5b194231b80e0b445fac09732 (MD5) SleightArthurChemistryBismuthatesBaBiO3RelatedSuperconductingPhases(SupplementaryInformation).pdf: 778085 bytes, checksum: b83c4cfe415f2d2a52b9d8724d39cb66 (MD5)
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