{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/30682"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/30682","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Low temperature bulk modulus of solid argon","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.","abstract_html":"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.","abstract_has_math":false,"creators":["Wilkins, Ronald Wayne"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Simmons, R.O."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2012,"date_issued":"2012-04-19T20:23:01Z","date_published":"2012-04-19T20:23:01Z","updated_at":"2026-07-22T22:25:29Z","subjects":["argon solids","bulk modulus"],"languages":["en"],"rights":["© Ronald Wayne Wilkins"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["2006378"],"render_values":[{"text":"2006378","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/30682","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Simmons, R.O."]},{"key":"dc:creator","label":"Author","values":["Wilkins, Ronald Wayne"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2012-04-19T20:23:01Z","10000-01-01","1973"]},{"key":"dc:type","label":"Dc Type","values":["Dissertation / Thesis","text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["argon solids","bulk modulus"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["© Ronald Wayne Wilkins"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["2006378","http://hdl.handle.net/2142/30682"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["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.","Submitted by Megan O'Donnell (mnodonn2@illinois.edu) on 2012-04-19T20:23:01Z No. of bitstreams: 1 1973_wilkins.pdf: 4466222 bytes, checksum: 3d32aa83d90babcd0ddbda3ed31ef416 (MD5)","Made available in DSpace on 2012-04-19T20:23:01Z (GMT). No. of bitstreams: 1 1973_wilkins.pdf: 4466222 bytes, checksum: 3d32aa83d90babcd0ddbda3ed31ef416 (MD5) Previous issue date: 1973","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Megan O'Donnell (mnodonn2@illinois.edu) on 2012-04-19T20:23:01Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:10:16-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: dissertation/thesis","dissertation/thesis","U of I Only"]},{"key":"dc:title","label":"Title","values":["Low temperature bulk modulus of solid argon"]}]}],"canonical_facts":{"dc:contributor":["Simmons, R.O."],"dc:creator":["Wilkins, Ronald Wayne"],"dc:date":["2012-04-19T20:23:01Z","10000-01-01","1973"],"dc:description":["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.","Submitted by Megan O'Donnell (mnodonn2@illinois.edu) on 2012-04-19T20:23:01Z No. of bitstreams: 1 1973_wilkins.pdf: 4466222 bytes, checksum: 3d32aa83d90babcd0ddbda3ed31ef416 (MD5)","Made available in DSpace on 2012-04-19T20:23:01Z (GMT). No. of bitstreams: 1 1973_wilkins.pdf: 4466222 bytes, checksum: 3d32aa83d90babcd0ddbda3ed31ef416 (MD5) Previous issue date: 1973","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Megan O'Donnell (mnodonn2@illinois.edu) on 2012-04-19T20:23:01Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:10:16-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: dissertation/thesis","dissertation/thesis","U of I Only"],"dc:identifier":["2006378","http://hdl.handle.net/2142/30682"],"dc:language":["en"],"dc:rights":["© Ronald Wayne Wilkins"],"dc:subject":["argon solids","bulk modulus"],"dc:title":["Low temperature bulk modulus of solid argon"],"dc:type":["Dissertation / Thesis","text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."]},"updated_at":"2026-07-22T22:25:29Z"}