A systematic optical study of the Ba1−xKxBiO3 system

✍ Scribed by W. Markowitsch; H. Jodlbauer; V. Schlosser; W. Lang; K. Remschnig; P. Rogl

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 164 KB
• Volume: 185-189
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(91)91720-o

✦ Synopsis

Reflection spectra of Bat-dGBiO~ over a wide spectral range are reported. For x lower than the critical value of ~ 0.35 contributions of free carders, interband transitions and midgap absorption processes are observed. The plasma frequency is small (< 0.1 eV) for all x below the insulator to metal transition. Increasing x from 0 to -0.I results in a transfer of oscillator strength from the interband maximum to a midgap maximum. For x = 0.3 a fiat plasma edge is observed, which is deformed by remainders of both the interband and midgap maxima.