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Infrared Properties of Magnesium Oxide
Author(s) -
HANNA RINOUD
Publication year - 1965
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1965.tb14765.x
Subject(s) - crystallite , materials science , single crystal , attenuation coefficient , crystal (programming language) , scattering , absorption (acoustics) , dispersion (optics) , analytical chemistry (journal) , infrared , oxide , magnesium , resonance (particle physics) , optics , condensed matter physics , crystallography , chemistry , atomic physics , metallurgy , composite material , physics , programming language , chromatography , computer science
The absorption spectrum of polycrystalline and single‐crystal magnesium oxide was determined in the 4000 to 166 cm −1 spectral region. In the range 4000 to about 1100 cm −1 , the absorption coefficient of the polycrystalline MgO was higher than that of the single‐crystal MgO owing to scattering by the grain boundaries. This scattering decreased with increase of the grain diameter. No difference in reflectivity could be detected between the polycrystalline and single‐crystal material in the 4000 to 300 cm −l wave number region. The optical constants, n and k , were determined by the classical dispersion theory, assuming a single oscillator. From the maximum reflectivity, the resonance frequency was at 428 cm −1 ; the value obtained from the acoustical vibration was at 475 cm −1 . The corresponding s factors were 0.64 and 0.72, respectively.