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The Phonon Densities of States of AlN and ZrN

Published online by Cambridge University Press:  21 February 2011

C.-K. Loong
C.-K. Loong*
Affiliation:
Intense Pulsed Neutron Source Argonne National Laboratory, Argonne, IL 60439, U. S. A.
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Abstract

Phonons are thought to play a crucial role in the high thermal conductivity of AIN and ZrN. Using time-of-flight neutron spectroscopy, we have measured the phonon spectra of A1N and ZrN up to 300 meV (2400 cm−1). The one-phonon density of states (DOS) of AIN exhibits relatively sharp bands at about 33, 63, 83 and 91 meV. In addition, distinct multiple-phonon excitations were observed at ∼173 and 255 meV. The phonon DOS of ZrN displays similar features with the corresponding phonon energies shifted toward lower energies. The measured DOS of AIN is compared with results of molecular-dynamics simulations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 395: Symposium AAA – Gallium Nitride and Related Materials: The First International Symp , 1995 , 423
Copyright
Copyright © Materials Research Society 1996

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References

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