NORMAL MODES IN HEXAGONAL BORON NITRIDE.
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Date
1965
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
Pyrolytic boron nitride has been investigated using polarized infrared radiation in reflection and transmission. The optical anisotropy of the graphite-like structure ($\epsilon \bot$ and $\epsilon_{**}$) is a consequence of the anisotropy of the normal optically active lattice modes. One strong vibration and one somewhat weaker vibration has been observed for both the in plane $(E \bot c)$ and the out-of-plane $(E \|c)$ polarization. The eigenfrequencies, oscillator strengths and damping constants have been calculated from a classical dispersion fit to the reflectivity data. In addition only the strong in-plane vibration was observed in the Raman spectrum. The results are used to interpret the still debated stacking order in hexagonal boron nitride.
Description
This research from the Tyco Laboratories, Inc. was sponsored by AFCRL under Contract No. AF 19(628)-2845. This work from the Spectroscopy Laboratory, MIT, was supported in part by the National Science Foundation, Grant number GP-2111. This work from the Research Laboratory of Electronics, MIT, was supported in part by the Joint Services Electronics Program under contract DA 36-039-AMC-03200(E).
Author Institution: Tyco Laboratories, Inc. Waltham, Massachusetts; Spectroscopy Laboratory and Research Laboratory of Electronics, Massachusetts Institute of Technology
Author Institution: Tyco Laboratories, Inc. Waltham, Massachusetts; Spectroscopy Laboratory and Research Laboratory of Electronics, Massachusetts Institute of Technology