{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/77349"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/77349","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Elastic Constants of Plastic Crystals by Schaefer-Bergmann Scattering: Crystalline Cyclohexane and Deuteromethane","abstract":"The Schaefer-Bergmann technique for sound velocity measurement has been adapted for use with solidified liquids and gases. The advantages of this method for measuring elastic constants of plastic crystals are discussed. A method for determining both the elastic constants and the spacial orientation of the crystal from the light scattering data is presented.","abstract_html":"The Schaefer-Bergmann technique for sound velocity measurement has been adapted for use with solidified liquids and gases. The advantages of this method for measuring elastic constants of plastic crystals are discussed. A method for determining both the elastic constants and the spacial orientation of the crystal from the light scattering data is presented.","abstract_has_math":false,"creators":["Marx, Steven Vincent"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-05-13T15:41:35Z","date_published":"2015-05-13T15:41:35Z","updated_at":"2026-07-22T22:26:10Z","subjects":["Physics, Condensed Matter"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(UMI)AAI8302929"],"render_values":[{"text":"(UMI)AAI8302929","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/77349","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Marx, Steven Vincent"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-05-13T15:41:35Z","10000-01-01","1982"]},{"key":"dc:type","label":"Dc Type","values":["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."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Physics, Condensed Matter"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/77349","(UMI)AAI8302929"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The Schaefer-Bergmann technique for sound velocity measurement has been adapted for use with solidified liquids and gases. The advantages of this method for measuring elastic constants of plastic crystals are discussed. A method for determining both the elastic constants and the spacial orientation of the crystal from the light scattering data is presented.","Measurements of sound velocity at 10 MHz in both liquid and solid tetradeuteromethane (CD(,4)) and cyclohexane (C(,6)H(,12)) are described. The elastic constants of CD(,4) at 85.57 K are found to be C(,11) = 2.056 (+OR-) .015, C(,12) = 1.542 (+OR-) .015, C(,44) = 0.9387 (+OR-) .005 GPa. For cyclohexane at 278.6 K the results of the measurements are C(,11) = 2.5795 (+OR-) .015, C(,12) + 2C(,44) = 2.967 (+OR-) .03 GPa. It is argued that the separate elastic constants of cyclohexane are C(,12) = 2.251, C(,44) = 0.358 GPa.","The presence of dispersion in the case of cyclohexane and its absence in the case of methane is noted. Some peculiarities in the elastic behavior of plastic crystals are discussed in the light of an expected coupling between translational and orientational excitations in the crystal.","Made available in DSpace on 2015-05-13T15:41:35Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 8302929.PDF: 3805245 bytes, checksum: 3eb6db89d642865cb9acb6030c4703be (MD5) Previous issue date: 1982","Embargo set by: Seth Robbins for item 78560 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","121 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1982."]},{"key":"dc:title","label":"Title","values":["Elastic Constants of Plastic Crystals by Schaefer-Bergmann Scattering: Crystalline Cyclohexane and Deuteromethane"]}]}],"canonical_facts":{"dc:creator":["Marx, Steven Vincent"],"dc:date":["2015-05-13T15:41:35Z","10000-01-01","1982"],"dc:description":["The Schaefer-Bergmann technique for sound velocity measurement has been adapted for use with solidified liquids and gases. The advantages of this method for measuring elastic constants of plastic crystals are discussed. A method for determining both the elastic constants and the spacial orientation of the crystal from the light scattering data is presented.","Measurements of sound velocity at 10 MHz in both liquid and solid tetradeuteromethane (CD(,4)) and cyclohexane (C(,6)H(,12)) are described. The elastic constants of CD(,4) at 85.57 K are found to be C(,11) = 2.056 (+OR-) .015, C(,12) = 1.542 (+OR-) .015, C(,44) = 0.9387 (+OR-) .005 GPa. For cyclohexane at 278.6 K the results of the measurements are C(,11) = 2.5795 (+OR-) .015, C(,12) + 2C(,44) = 2.967 (+OR-) .03 GPa. It is argued that the separate elastic constants of cyclohexane are C(,12) = 2.251, C(,44) = 0.358 GPa.","The presence of dispersion in the case of cyclohexane and its absence in the case of methane is noted. Some peculiarities in the elastic behavior of plastic crystals are discussed in the light of an expected coupling between translational and orientational excitations in the crystal.","Made available in DSpace on 2015-05-13T15:41:35Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 8302929.PDF: 3805245 bytes, checksum: 3eb6db89d642865cb9acb6030c4703be (MD5) Previous issue date: 1982","Embargo set by: Seth Robbins for item 78560 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","121 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1982."],"dc:identifier":["http://hdl.handle.net/2142/77349","(UMI)AAI8302929"],"dc:language":["eng"],"dc:subject":["Physics, Condensed Matter"],"dc:title":["Elastic Constants of Plastic Crystals by Schaefer-Bergmann Scattering: Crystalline Cyclohexane and Deuteromethane"],"dc:type":["text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:26:10Z"}