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https://hdl.handle.net/2142/25860
Description
Title
The X-ray Debye temperature of solid krypton
Author(s)
Windecker, Richard Chase
Issue Date
1970
Doctoral Committee Chair(s)
Simmons, R.O.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
x-ray debye temperature
solid krypton
x-ray Bragg reflections
Language
en
Abstract
"Measurements of integrated intensities of X-ray Bragg reflections have been
made as a function of temperature on two large single crystal specimens of solid
krypton. These data have been interpreted in terms of a Debye characteristic
temperature, 8
M
"" according to the method suggested by Nicklow and Young. The
specimens were prepared and maintained in a specially designed and constructed
rigid-tail liquid helium cryostat and the measurements were made with a fourcircle
X-ray diffractometer designed for use with this cryostat.
The values of 8M, obtained in this work show a general qualitative agreement
with existing quasi-harmonic and anharmonic theories, but suggest that
further refinement is needed in the anharmonic theories. These results are also
in general agreement with other thermodynamic data on solid krypton obtained by
a diversity of experiments, including heat capacity measurements, vapor pressure
measurements, entropy measurements, and neutron phonon dispersion measurements.
On the other hand, the results of the present experiment disagree sharply with
two previous experiments based on the Mossbauereffect, implying that there was
some difficulty inherent in the Mossbauer methods.
The high and low temperature expansions of 8M, in the harmonic approximation
have been obtained showing that the high- and low-temperature limiting values of
8M, in this approximation are 8(-2) and 8(-3), respectively. The experimental
value of 8(-2) obtained by this work is 67 +.5 K."
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