Abstract
Temperature dependent x-ray absorption investigations have been made on the Bi L 3 edge in BaPb 1-x Bi x O 3 with x=0.0, 0.75, 1.0. Essentially abnormal behaviour of the Debye-Waller factor σ 2 of Bi-O bonds was observed at low temperatures for BaBiO 3 and BaPb 0.25 Bi 0.75 O 3 in contrast to Einstein model. It was found that the Debye-Waller factors of both Bi-O bonds increase with temperature decreasing from 90 K along with abnormal increasing of Bi-O and Bi-Ba distances. At the same time Pb-O, Pb-Ba bonds of BaPbO 3 show normal behaviour with temperature. The nature of the anomalies is discussed in the frame of the dynamic fluctuation of the oxygen octahedra rotation mode that may give a new look to understanding of HTSC phenomenon in BaPb 1-x Bi x O 3 and Ba 1-x K x BiO 3 .
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