TITLE:
Behavior of Ultrasonic Attenuation in MnO
AUTHORS:
Krishna Murti Raju
KEYWORDS:
Elastic Constants; Ultrasonic Attenuation; Phonon-Phonon Interaction; MnO
JOURNAL NAME:
Open Journal of Acoustics,
Vol.3 No.3A,
September
12,
2013
ABSTRACT: Temperature dependence of
ultrasonic attenuation and allied parameters are investigated for manganese oxide in the
temperature range 300-500 K. These calculations are made for longitudinal and
shear waves along the , and crystallographic
directions of propagation. If the values of second order elastic constants and density at a
particular temperature are known for any substance, one may obtain ultrasonic
velocities for longitudinal and shear waves which give an important information
about its internal structure, inherent and anharmonic properties. The non-linearity coupling parameters and thermal
relaxation time have also obtained for this crystal. In the present investigation,
it has been found that phonon-phonon interaction is the dominant cause for
ultrasonic attenuation. This study will be useful in characterisation of the material and it will give a clear
picture of the behaviour of ultrasonic attenuation
in MnO.