User:OrganoMetallurgy/Drafts/Barium bismuthate
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Other names
BBO, BaBiO3
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Identifiers | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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non-chembox sections
[edit]Barium bismuthate(III)(V), BaBiO3, is a mixed valence semiconductive oxide with a perovskite structure which becomes superconductive at low temperatures when suitably hole doped.
Properties
[edit]Semiconductive Losses some oxygen at high temperatures.
Crystal structure
[edit]BaBiO3 is a perovskite, there are two distinct bismuth sites It is monoclinic, space group I2/m at room temperature. At temperatures between 430 and 820 K it is rhombohedral with the space group R3, above 820 K it is cubic, space group Fm3m. Below 140 K it is monoclinic with the space group P21/n.
Synthesis
[edit]Electrocrystallization
Melt and anneal under high oxygen pressure
Superconductivity
[edit]Potassium barium bismuth oxide (Ba1-xKxBiO3)
[edit]Potassium barium bismuth oxide is a superconductor from x ≈ 0.3 to 0.45 the maximum Tc is around 32 K at the approximate composition Ba0.6K0.4BiO3.
The superconductive phase is cubic, space group Fm3m, at room temperature, and tetragonal, space group I4/mcm, at low temperatures.
The different bismuth sites become more equivalent?/disordered?/less distinct with increasing hole doping.
BaPb1-xBixO3
[edit]See the article of barium plumbate for more information.
BaPb1-xBixO3 is a superconductor in the composition range x = 0.15 to 0.30 with a maximum Tc of ~12 K at x ≈ 0.25
Applications
[edit]References
[edit]- ^ Sleight, Arthur W. "Bismuthates: BaBiO3 and related superconducting phases". Physica C: Superconductivity and its Applications. 514: 152–165. doi:10.1016/j.physc.2015.02.012.