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Radiative Optical Modes of Vibration in CeO 2 Thin Films
Author(s) -
Mochizuki S.
Publication year - 1985
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221280103
Subject(s) - anharmonicity , phonon , materials science , radiative transfer , polariton , dispersion (optics) , spectral line , optics , reflection (computer programming) , thin film , substrate (aquarium) , condensed matter physics , optoelectronics , physics , oceanography , astronomy , geology , computer science , nanotechnology , programming language
The radiative optical modes of vibration in a CeO 2 thin film on a metal substrate are observed at various temperatures from room temperature to 1273 K by the reflection and thermal‐emission methods. A comparison of the experimental spectra and the theoretical ones shows good agreement. The upper branch of the polariton dispersion curve of CeO 2 at room temperature is determined by analyzing the incident‐angle dependence of the virtual mode spectra centered near the longitudinal‐optical phonon frequency of CeO 2 bulk crystal. The temperature dependence of the longitudinal‐optical phonon frequency of CeO 2 is determined by the measurements of the virtual‐mode frequency shift with temperature under small incident (emission) angle condition and is discussed in terms of the thermal expansion and other anharmonic effects.