Defect-Induced Far-Infrared Absorption and Vacancy Modes in Ion Conductive CeO_2:CaO Solid Solution

概要

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The far-infrared absorption of pure CeO_2, CeO_2:CaO and CeO_2:ZrO_2 solid solutions has been measured at 11 and 297 K in the region l0-100cm^<-1>. Two apparent absorption peaks are found at 11 K in the vicinity of 50-80cm^<-1> only in the CeO_2:CaO solid solution with oxygen vacancies, not in the CeO_2:ZrO_2 solid solution without oxygen vacancies and are assigned to be due to oxygen vacancy modes or attempt modes. The continuous absorption showing a nearly quartic frequency dependence is observed in both the CeO_2:CaO and CeO_2:ZrO_2 solid solutions. This continuous absorption reflects the density of states of acoustic modes and exhibits non-glass-like temperature and frequency dependencies. It is suggested from the above result that the so-called boson peak in glasses does not possess the acoustic mode-like character.
社団法人日本物理学会の論文
2003-11-15