Abstract
A multicomponent infrared study of boron nitride (BN) pyrocrystals was performed in polarized light. A series of textured polycrystals, which included samples with different dergees of ordering, with various ratios of the concentrations of the hexagonal and rhombohedral phase, was prepared by chemical vapor deposition. This study revealed the essential influence of the microstructure of the pyrocrystal on the reflection and transmission spectra. It is shown that to identify the normal oscillations of the hexagonal phase, crystal-optical effects and effects associated with phonon scattering must be taken into account. The normal oscillations of the rhombohedral phase of BN were identified directly from experimental spectra of pyrocrystals which are similar in their properties to a single crystal. On the basis of the results obtained by us it is shown that ionic-covalent bonds exist between some of the atoms of neighboring layers in anisotropic modifications of BN. A refined model of the lattice structure eliminates an entire host of contradictions between the experimental data and shows that in addition to sp 2 hybridized electrons, sp hybridized electrons participate in the formation of interatomic bonds in anisotropic BN.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
B. N. Sharupin, in Chemical Gas-Phase Deposition of Refractory Inorganic Materials, edited by V. S. Shpak and R. G. Avarbé (Leningrad, 1976).
F. Bassani and G. P. Parravicini, Electron States and Optical Transitions in Solids (Nauka, Moscow, 1982).
O. Madelung, Physics of III–V Compounds (Wiley, New York, 1964).
R. Geick, C. H. Perry, and G. Rupprecht, Phys. Rev. 146, 543 (1966).
H. Poulet and J. P. Mathieu, Vibrational Spectra and Symmetry of Crystals (Gordon and Breach, Paris, 1970).
G. N. Zhizhin, G. N. Mavrin, and V. F. Shabanov, Vibrational Spectra of Crystals (Nauka, Moscow, 1984).
V. K. Zaitsev, S. V. Ordin, V. I. Tarasov, and M. I. Fedorov, Fiz. Tverd. Tela 21, 2517 (1979) [Sov. Phys. Solid State 21, 1454 (1979)].
Optical Properties of III–V Semiconductors (Mir, Moscow, 1970).
G. B. Bokii, Crystal Chemistry (Nauka, Moscow, 1971).
Yu. S. Barash, van der Waals Forces (Nauka, Moscow, 1988).
Handbook of Optics, edited by W. G. Driscoll (McGraw-Hill Book Company, N.Y., 1974), p. 7–40, 41, 65, 9–100.
J. P. Suchet, Chemical Physics of Semiconductors (Van Nostrand, New York, 1965).
Author information
Authors and Affiliations
Additional information
Fiz. Tekh. Poluprovodn. 32, 1033–1042 (September 1998)
Rights and permissions
About this article
Cite this article
Ordin, S.V., Sharupin, B.N. & Fedorov, M.I. Normal lattice vibrations and the crystal structure of anisotropic modifications of boron nitride. Semiconductors 32, 924–932 (1998). https://doi.org/10.1134/1.1187516
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1134/1.1187516