Abstract
We have investigated the absorption of the Co doped Bi12MO20 (M = Si, Ti) in the spectral region 12 092–18 149 cm-1. The observed absorption band is due to the Co-impurity in the visible spectral region. This absorption band does not contain information about the exact energy position of the Co levels. Therefore, we have calculated the second derivative of absorption. It is established that Co2+ ions are surrounded by distorted tetrahedral coordination in Bi12SiO20 (BSO). The energy level structure of the Co2+ ion in BSO and this of Co3+ ion in Bi12TiO20 are also presented. We have calculated the crystal field parameter Dq and the Racah parameters B and C for Co2+ ion.
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