Study of Interface Phonons in Lamellar Eutectics

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Abstract
Infrared quasinormal reflectivity has been measured at room temperature betweeen 200 and 700 cm−1 on lamellar eutectic mixtures LiF-NaF. The samples were cut perpendicular to the lamellae and their period was 1 or 7 μ. The difference between the experimental curves and a “theoretical” reflectivity, which is a weighted sum of the reflectivity curves of the pure compounds, is attributed to the interfaces. The difference curves exhibit five peaks, three of which are centered near bulk frequencies of the compounds. The other two are interpreted as interface modes and their frequencies compare quite well with the theory.

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