Abstract
AbstractThe Raman spectra of the superionic conductors K1.6Mg0.8Ti7.2O16, Cs1.2Mg0.6Ti7.4O1.6, and (KTI)1.6Mg0.8Ti7.2O16 are measured in the frequency range from 5 to 1000 cm−1. In the range from 100 to 1000 cm−1 Raman spectra hardly show alkali ion dependence. On the contrary, in the frequency range from 5 to 100 cm−1, an additional Raman band is observed. This Raman band shows alkali ion dependence. By using the Frenkel‐Kontorova model for the hollandite crystal with the given configuration of the mobile ions, it is found that the dependence of vibrational frequency of mobile ions with kinds of alkali ion is well explained and that the concept of “super unit cell” that is introduced by Beyeler is very useful to explain the Raman bands which are observed below 100 cm−1 in hollandite crystals.
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