Abstract
According to the bond fluctuation model of superionic conductors, the polarizability of a material that exhibit high ionic conductivity must be large. That is, the model predicts that ion conducting materials must have large values of optical constants. This prediction has been confirmed recently, through a comparative study of the nonlinear optical constants of ion conducting and non-conducting glasses. In the present report, the values of the nonlinear optical constants χ (3) of R 2 O–B 2 O 3 (R = Rb, Cs, Ag) glasses have been estimated by using the bond orbital theory. For the Rb 2 O–B 2 O 3 and Cs 2 O–B 2 O 3 glasses, a good agreement between the calculated and the measured values has been found. On the other hand, for the Ag 2 O–B 2 O 3 system, a deviation was observed. Such a disagreement has been explained by taking into account the contribution of d-electrons of the Ag ions, which plays also a fundamental role in the ion transport mechanism.
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