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The fundamental absorption edge in Bi 12 SiO 20

1986; Institute of Physics; Volume: 19; Issue: 5 Linguagem: Inglês

10.1088/0022-3727/19/5/023

1361-6463

Taro Toyoda, Shingo Maruyama, Hideyuki Nakanishi, Satoshi Endo, Tetsumi Irie,

Advanced Chemical Physics Studies

The optical absorption spectra of facet-core-free and facet-core parts in Bi12SiO20 have been measured precisely at various temperatures between 30 and 300K and analysed in the region of the absorption coefficient from 50 to 1600 cm-1. The data are interpreted as indicating there are indirect allowed transitions with energy gaps of 3.380 eV (facet-core-free) and 3.353 eV (with facet core) at 0K. The temperature dependence of the energy gaps in facet-core-free and facet-core parts are different from each other within experimental accuracy.