Phonon density of states of bulk gallium nitride
作者:
J. C. Nipko,
C.-K. Loong,
C. M. Balkas,
R. F. Davis,
期刊:
Applied Physics Letters
(AIP Available online 1998)
卷期:
Volume 73,
issue 1
页码: 34-36
ISSN:0003-6951
年代: 1998
DOI:10.1063/1.121714
出版商: AIP
数据来源: AIP
摘要:
We report the measured phonon density of states of a bulk GaN powder by time-of-flight neutron spectroscopy. The observed one-phonon excitation spectrum consists of two broad bands centered at about 23 and 39 meV corresponding to the acoustic and the first group of optical phonons; two sharp bands of upper optic modes at about 75 and 86 meV; and a gap of 45–65 meV. The phonon dispersion curves, lattice specific heat, and Debye temperature are calculated from fitting the data with a rigid-ion model. ©1998 American Institute of Physics.
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