{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/25398"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/25398","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Low-temperature thermal expansion of amorphous solids","abstract":"\"For most amorphous materials at temperatures below ~ 1 K, the magnitudes and temperature dependences of specific heat, thermal conductivity and ultrasonic dispersion are qualitatively similar, independent of chemical composition. It has been suggested that thermal expansion also exhibits this universal behavior. The development of a dilatometer cap- 12 able of resolving sample strains as small as 10 has permitted measurement of the linear thermal expansion of various glasses below 1 K. These investigations ha\\\"\"e demonstrated, however, that the low-temperature thermal expansion coefficient of glasses can be positive, negative, large or small. analysis of measurements performed. on two types of vitreous silica, two amorphous polymers, As2S3 and Zr02 : Y 203 is presented in the context of the phenonenclogical tunneling-states model Consistency in explanation of thermal expansion and ultrasonic behavior maintained by assuming a broad, weakly energy-dependent distribution of coupling strengths between phonons and the localized excitations thought to be characteristic of the glassy state.\"","abstract_html":""For most amorphous materials at temperatures below ~ 1 K, the magnitudes and temperature dependences of specific heat, thermal conductivity and ultrasonic dispersion are qualitatively similar, independent of chemical composition. It has been suggested that thermal expansion also exhibits this universal behavior. The development of a dilatometer cap- 12 able of resolving sample strains as small as 10 has permitted measurement of the linear thermal expansion of various glasses below 1 K. These investigations ha\\""e demonstrated, however, that the low-temperature thermal expansion coefficient of glasses can be positive, negative, large or small. analysis of measurements performed. on two types of vitreous silica, two amorphous polymers, As2S3 and Zr02 : Y 203 is presented in the context of the phenonenclogical tunneling-states model Consistency in explanation of thermal expansion and ultrasonic behavior maintained by assuming a broad, weakly energy-dependent distribution of coupling strengths between phonons and the localized excitations thought to be characteristic of the glassy state."","abstract_has_math":false,"creators":["Ackerman, David Alan"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Anderson, A.C."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-06-13T16:37:29Z","date_published":"2011-06-13T16:37:29Z","updated_at":"2026-07-22T22:25:24Z","subjects":["low-temperature thermal expansion","amorphous solids","specific heat","thermal conductivity","ultrasonic dispersion"],"languages":["en"],"rights":["Copyright 1982 David Alan Ackerman"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["19409"],"render_values":[{"text":"19409","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/25398","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Anderson, A.C."]},{"key":"dc:creator","label":"Author","values":["Ackerman, David Alan"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-06-13T16:37:29Z","10000-01-01","1982"]},{"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":["low-temperature thermal expansion","amorphous solids","specific heat","thermal conductivity","ultrasonic dispersion"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1982 David Alan Ackerman"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["19409","http://hdl.handle.net/2142/25398"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["\"For most amorphous materials at temperatures below ~ 1 K, the magnitudes and temperature dependences of specific heat, thermal conductivity and ultrasonic dispersion are qualitatively similar, independent of chemical composition. It has been suggested that thermal expansion also exhibits this universal behavior. The development of a dilatometer cap- 12 able of resolving sample strains as small as 10 has permitted measurement of the linear thermal expansion of various glasses below 1 K. These investigations ha\\\"\"e demonstrated, however, that the low-temperature thermal expansion coefficient of glasses can be positive, negative, large or small. analysis of measurements performed. on two types of vitreous silica, two amorphous polymers, As2S3 and Zr02 : Y 203 is presented in the context of the phenonenclogical tunneling-states model Consistency in explanation of thermal expansion and ultrasonic behavior maintained by assuming a broad, weakly energy-dependent distribution of coupling strengths between phonons and the localized excitations thought to be characteristic of the glassy state.\"","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-13T16:37:29Z No. of bitstreams: 1 1982_ackerman.pdf: 3134834 bytes, checksum: ab6aaf58678b64504d26ce0fb8567573 (MD5)","Made available in DSpace on 2011-06-13T16:37:29Z (GMT). No. of bitstreams: 1 1982_ackerman.pdf: 3134834 bytes, checksum: ab6aaf58678b64504d26ce0fb8567573 (MD5) Previous issue date: 1982","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-06-13T16:37:29Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:14:35-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"]},{"key":"dc:title","label":"Title","values":["Low-temperature thermal expansion of amorphous solids"]}]}],"canonical_facts":{"dc:contributor":["Anderson, A.C."],"dc:creator":["Ackerman, David Alan"],"dc:date":["2011-06-13T16:37:29Z","10000-01-01","1982"],"dc:description":["\"For most amorphous materials at temperatures below ~ 1 K, the magnitudes and temperature dependences of specific heat, thermal conductivity and ultrasonic dispersion are qualitatively similar, independent of chemical composition. It has been suggested that thermal expansion also exhibits this universal behavior. The development of a dilatometer cap- 12 able of resolving sample strains as small as 10 has permitted measurement of the linear thermal expansion of various glasses below 1 K. These investigations ha\\\"\"e demonstrated, however, that the low-temperature thermal expansion coefficient of glasses can be positive, negative, large or small. analysis of measurements performed. on two types of vitreous silica, two amorphous polymers, As2S3 and Zr02 : Y 203 is presented in the context of the phenonenclogical tunneling-states model Consistency in explanation of thermal expansion and ultrasonic behavior maintained by assuming a broad, weakly energy-dependent distribution of coupling strengths between phonons and the localized excitations thought to be characteristic of the glassy state.\"","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-13T16:37:29Z No. of bitstreams: 1 1982_ackerman.pdf: 3134834 bytes, checksum: ab6aaf58678b64504d26ce0fb8567573 (MD5)","Made available in DSpace on 2011-06-13T16:37:29Z (GMT). No. of bitstreams: 1 1982_ackerman.pdf: 3134834 bytes, checksum: ab6aaf58678b64504d26ce0fb8567573 (MD5) Previous issue date: 1982","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-06-13T16:37:29Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:14:35-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"],"dc:identifier":["19409","http://hdl.handle.net/2142/25398"],"dc:language":["en"],"dc:rights":["Copyright 1982 David Alan Ackerman"],"dc:subject":["low-temperature thermal expansion","amorphous solids","specific heat","thermal conductivity","ultrasonic dispersion"],"dc:title":["Low-temperature thermal expansion of amorphous solids"],"dc:type":["Dissertation / Thesis","text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."]},"updated_at":"2026-07-22T22:25:24Z"}