Lattice constant, thermal expansion, and isothermal compressibility measurements on argon single crystals
Peterson, Otis Granville
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https://hdl.handle.net/2142/23978
Description
Title
Lattice constant, thermal expansion, and isothermal compressibility measurements on argon single crystals
Author(s)
Peterson, Otis Granville
Issue Date
1965
Doctoral Committee Chair(s)
Simmons, R.O.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
lattice constant
thermal expansion
isothermal compressibility
argon single crystals
back-reflection x-ray diffractometer
Language
en
Abstract
The lattice constant of an argon single crystal has
been measured as a function of temperature with a precision,
back-reflection x-ray diffractometer. From this determination
the total thermal expansion and the coefficient of thermal
expansion have been obtained. Also', a preliminary measurement
has been made on the isothermal compressibility of solid
argon at liquid helium temperature. This was done using the
same x-ray measurement technique. No previous compressibility
measurements have been made at this temperature, and the
thermal expansivity measurements were obtained with 30 times
the previously attained accuracy.
Essential to the successful completion of these measurements
was the growth of high quality single crystals in a
rigid cryostat possessing fine temperature control over
a large range. Such a cryostat was designed and built with
a unique tail assembly which provided the required rigidity
and w,ith a heat exchanger which permitted temperature
regulation of ±. O.OloK throughout the range from 2.3°K to
i.
the triple point of argon. The essential growth parameters
were investigated and optimized so that single crystals of
the necess,ary quality could be grown to a size as large as
their container.
From the measured compressibility and expansivi ty, valu'es
of the thermodynamic properties of argon were compiled and
compared with theory. The values of the Gruneisen parameter,
the Debye temperature and the thermal vacancy content were
compared with theory with agreement within the experimental
error.
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