Temperature dependence of refractive index and electronic polarizability of KNbGeO5 glass and its nanocrystallized glasses

Honma, Tsuyoshi; Ito, Noriko; Dimitrov, Vesselin; Komatsu, Takayuki
March 2009
Journal of Applied Physics;Mar2009, Vol. 105 Issue 5, pN.PAG
Academic Journal
The refractive indices (n) and densities (ρ) of a glass and transparent nanocrystallized glasses with the composition of 25K2O-25Nb2O5–50GeO2 (i.e., KNbGeO5) are measured in the temperature range of 30–150 °C in order to clarify the temperature dependences of the electronic polarizability of oxide ions (αO2-) and optical basicity (Λ). It is found that the values of n, αO2-, and Λ increase almost linearly with increasing temperature, and the values of the temperature dependence of these properties, i.e., dn/dT, dαO2-/dT, and dΛ/dT, tend to decrease slightly due to the nanocrystallization. It is clarified that the temperature dependence of the electronic polarizability of oxide ions in the precursor glass and nanocrystallized glasses has a large contribution for the temperature dependence of the refractive index in comparison with the contribution of density (volume thermal expansion). The features in the temperature dependences of αO2- and Λ in the present glass system is related to the large optical basicities of the constituent oxides of K2O, Nb2O5, and GeO2.


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