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Title:Low temperature bulk modulus of solid argon
Author(s):Wilkins, Ronald Wayne
Director of Research:Simmons, R.O.
Department / Program:Physics
Discipline:Physics
Degree:Ph.D.
Genre:Dissertation
Subject(s):argon solids
bulk modulus
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.
Issue Date:1973
Genre:Dissertation / Thesis
Type:Text
Language:English
URI:http://hdl.handle.net/2142/30682
Rights Information:© Ronald Wayne Wilkins
Date Available in IDEALS:2012-04-19
Identifier in Online Catalog:2006378


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