This item is only available for download by members of the University of Illinois community. Students, faculty, and staff at the U of I may log in with your NetID and password to view the item. If you are trying to access an Illinois-restricted dissertation or thesis, you can request a copy through your library's Inter-Library Loan office or purchase a copy directly from ProQuest.
Permalink
https://hdl.handle.net/2142/30682
Description
Title
Low temperature bulk modulus of solid argon
Author(s)
Wilkins, Ronald Wayne
Issue Date
1973
Director of Research (if dissertation) or Advisor (if thesis)
Simmons, R.O.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
argon solids
bulk modulus
Language
en
Abstract
The lattice parameter of a free-standing argon crystal has been measured as a function of pressure at constant temperature using a high precision back-reflection X-ray camera. Low temperature measurements,
using helium as the pressure transmitting fluid, are reported which cover the pressure range of 10 to 300 bar.
These measurements, which are the first direct measurements on a
free-standing argon crystal in this pressure range, give a P=O, T=O bulk modulus of 28.8±0.4 kbar. This value is in good agreement with the value obtained by extrapolating recent piston-displacement measurements to P=O
and also with recent theoretical calculations which incorporate three-body forces.
A comparison with values of the P=O, T=O bulk modulus obtained from sound velocity measurements shows significant discrepancies. Experimental difficulties in the sound velocity measurements which could account
for these discrepancies are discussed.
A survey of experimental and theoretical values of the bulk modulus and elastic constants of solid argon at higher temperatures is presented. The need for further experimental work, particularly elastic constant measurements at intermediate and low temperatures is apparent.
Modifications of the apparatus used in the present measurements which would increase the usefulness of the present experimental technique are discussed.
Use this login method if you
don't
have an
@illinois.edu
email address.
(Oops, I do have one)
IDEALS migrated to a new platform on June 23, 2022. If you created
your account prior to this date, you will have to reset your password
using the forgot-password link below.
