The dependence of the refractive index of Bi12GeO20 on pressure (0.001 to 14 kbar) and temperature (20 to 330°C) is reported at different wavelengths between 0.5 and 0.7 μm. We have analyzed our data in terms of Kettler, Sellmeier–Drude, and Lorentz–Lorenz dispersion formulas; however, in close parallel with the results of our study of the ORD, it is found that even with these data no unique choice can be made among the various models such that all the data would be described by it. In order to make this choice, all of the data obtained from both the refractive and ORD studies were then considered. It is then found that a Sellmeier–Drude formula describes our data on n(λ) and the Agranovich-type formula is favored, though not overwhelmingly, for the ORD data of Bi12GeO20.
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