Monterey, California: U.S. Naval Postgraduate School
Abstract
Large single crystals of benzene (C5H5) were aligned by an
optical method. The aligned crystals were pulsed with ultrasonic
waves at a frequency of approximately 10 megacycles per second using
quartz crystal transducers. The velocity of the ultrasonic waves
was measured by comparing the echo transit time with that of simultaneously
generated waves moving through a variable length path in
a medium in which the velocity of sound was known precisely.
Velocities of longitudinal and transverse waves along each of
the principal axes of the orthorhombic crystal were used to compute
the main diagonal terms of the Cij matrix. The off-diagonal terms
were then determined by velocity measurements along arbitrarily
selected directions.
Velocity measurements were made and the elastic constants
computed over the temperature range 170°K to 250°K.
Absorption in the crystal was measured over the same temperature
range for each of the directions used for velocity measurements. The
absorption was determined to be aelotropic.http://archive.org/details/determinationofe1094511975Lieutenant Commander, Royal Canadian NavyLieutenant, United States NavyApproved for public release; distribution is unlimited
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