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Radiative Optical Modes of Vibration in NiO Thin Film
Author(s) -
Mochizuki S.
Publication year - 1984
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.2221260113
Subject(s) - anharmonicity , materials science , reflection (computer programming) , phonon , radiative transfer , non blocking i/o , polariton , dispersion (optics) , thin film , spectral line , condensed matter physics , thermal , optics , optoelectronics , chemistry , physics , thermodynamics , nanotechnology , biochemistry , astronomy , computer science , programming language , catalysis
Radiative optical modes of vibration in NiO thin films on metal substrates are observed at various temperatures from room temperature to 1273 K by reflection and thermal emission methods. A comparison of the experimental spectra and the theoretical ones shows that the correlation between them is good. The upper branch of the polariton dispersion curve of NiO at room temperature is determined experimentally by analysing the reflection spectra due to the virtual mode near the longitudinal optical phonon frequency. The shift in the longitudinal optical phonon frequency with temperature is discussed in terms of thermal expansion and other anharmonic effects.