X-ray absorption of BaBiO3 and superconducting BaBi0.25Pb0.75O3
J. B. Boyce, F. G. Bridges, T. Claeson, T. H. Geballe, J. M. Remeika
DOI 10.1103/PhysRevB.41.6306 · Physical Review B
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Abstract
X-ray-absorption studies of BaBiO3 and superconducting BaBi0.25Pb0.75O3 (Ba-Bi-Pb-O) did not show any structural transformations altering the gross-scale near-neighbor environment or the valence between 4 and 300 K. Two Bi-O distances, separated by about 0.17 Å, could be distinguished for BaBiO3. Also in Ba-Bi-Pb-O, there is a strong indication of two different Bi-O distances, separated by about 0.12 Å, but only one Pb-O distance. The differing Bi-O separations may be connected with local spatial charge fluctuations. The valence states of the two differently located Bi atoms could not be conclusively determined from the absorption-edge shape, but the Bi and Pb near-edge structures for Ba-Bi-Pb-O are nearly identical. The Bi-O and Pb-O vibrational frequencies, considered important for superconductivity, could be estimated from the temperature dependence of the broadening of the nearest-neighbor distributions; they correspond to Einstein temperatures of about 500 K.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaBi0.25Pb0.75O3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.77 | Pressure not reported | unknown |
| BaBi0.25Pb0.75O3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12 | Pressure not reported | unknown |
| Ba1-xKxBiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | unknown |
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