{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/25397"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/25397","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"An ultrasonic study of trapped hydrogen in niobium","abstract":"The purpose of the present work is to establish a model for the configuration of hydrogen trapped at interstitial oxygen or nitrogen impurities in BCC metals. Such a model would 'be important for an understanding of the physical properties of such systems, particularly of the quantum diffusion effects which occur. A review of all the available data (specific heat, internal friction, neutron scattering, channeling, thermal conductivity) on Nb-O-H or Nb-N-H systems, is first given. By reexamining the data for clues, an eight-state tunnelling model is proposed, and the properties of the system are developed. A comparison of the predictions of this model with the data is given, and the four parameters that describe the model are determined. A simple potential calculation is also performed to demonstrate the qualitative features of the model. Measurements have been made of ultrasonic attenuation and velocity in the Nb-O-H system as a function of temperature, frequency, polarization and isotope. In addition to the previously found stable peak, an additional peak is found when the specimen is cooled rapidly. The peak anneals at the same temperature as those found by Hanada in their resistivity quenching experiments, indicating that the quenched-in defect is an OH2 complex. An extension of the model described in Part A is given to account for the relaxation.","abstract_html":"The purpose of the present work is to establish a model for the configuration of hydrogen trapped at interstitial oxygen or nitrogen impurities in BCC metals. Such a model would 'be important for an understanding of the physical properties of such systems, particularly of the quantum diffusion effects which occur. A review of all the available data (specific heat, internal friction, neutron scattering, channeling, thermal conductivity) on Nb-O-H or Nb-N-H systems, is first given. By reexamining the data for clues, an eight-state tunnelling model is proposed, and the properties of the system are developed. A comparison of the predictions of this model with the data is given, and the four parameters that describe the model are determined. A simple potential calculation is also performed to demonstrate the qualitative features of the model. Measurements have been made of ultrasonic attenuation and velocity in the Nb-O-H system as a function of temperature, frequency, polarization and isotope. In addition to the previously found stable peak, an additional peak is found when the specimen is cooled rapidly. The peak anneals at the same temperature as those found by Hanada in their resistivity quenching experiments, indicating that the quenched-in defect is an OH2 complex. An extension of the model described in Part A is given to account for the relaxation.","abstract_has_math":false,"creators":["Huang, Kai-Feng"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Granato, A.V."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-06-13T16:25:52Z","date_published":"2011-06-13T16:25:52Z","updated_at":"2026-07-22T22:25:24Z","subjects":["trapped hydrogen","niobium","interstitial oxygen","BCC metals"],"languages":["en"],"rights":["1982 Kai-Feng Huang"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["18290"],"render_values":[{"text":"18290","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/25397","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Granato, A.V."]},{"key":"dc:creator","label":"Author","values":["Huang, Kai-Feng"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-06-13T16:25:52Z","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":["trapped hydrogen","niobium","interstitial oxygen","BCC metals"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["1982 Kai-Feng Huang"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["18290","http://hdl.handle.net/2142/25397"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The purpose of the present work is to establish a model for the configuration of hydrogen trapped at interstitial oxygen or nitrogen impurities in BCC metals. Such a model would 'be important for an understanding of the physical properties of such systems, particularly of the quantum diffusion effects which occur. A review of all the available data (specific heat, internal friction, neutron scattering, channeling, thermal conductivity) on Nb-O-H or Nb-N-H systems, is first given. By reexamining the data for clues, an eight-state tunnelling model is proposed, and the properties of the system are developed. A comparison of the predictions of this model with the data is given, and the four parameters that describe the model are determined. A simple potential calculation is also performed to demonstrate the qualitative features of the model. Measurements have been made of ultrasonic attenuation and velocity in the Nb-O-H system as a function of temperature, frequency, polarization and isotope. In addition to the previously found stable peak, an additional peak is found when the specimen is cooled rapidly. The peak anneals at the same temperature as those found by Hanada in their resistivity quenching experiments, indicating that the quenched-in defect is an OH2 complex. An extension of the model described in Part A is given to account for the relaxation.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-13T16:25:52Z No. of bitstreams: 1 1982_huang.pdf: 3430065 bytes, checksum: ffafb34f7bdb9eea7e716751ea43d37a (MD5)","Made available in DSpace on 2011-06-13T16:25:52Z (GMT). No. of bitstreams: 1 1982_huang.pdf: 3430065 bytes, checksum: ffafb34f7bdb9eea7e716751ea43d37a (MD5) Previous issue date: 1982","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-06-13T16:25:52Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:14:22-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"]},{"key":"dc:title","label":"Title","values":["An ultrasonic study of trapped hydrogen in niobium"]}]}],"canonical_facts":{"dc:contributor":["Granato, A.V."],"dc:creator":["Huang, Kai-Feng"],"dc:date":["2011-06-13T16:25:52Z","10000-01-01","1982"],"dc:description":["The purpose of the present work is to establish a model for the configuration of hydrogen trapped at interstitial oxygen or nitrogen impurities in BCC metals. Such a model would 'be important for an understanding of the physical properties of such systems, particularly of the quantum diffusion effects which occur. A review of all the available data (specific heat, internal friction, neutron scattering, channeling, thermal conductivity) on Nb-O-H or Nb-N-H systems, is first given. By reexamining the data for clues, an eight-state tunnelling model is proposed, and the properties of the system are developed. A comparison of the predictions of this model with the data is given, and the four parameters that describe the model are determined. A simple potential calculation is also performed to demonstrate the qualitative features of the model. Measurements have been made of ultrasonic attenuation and velocity in the Nb-O-H system as a function of temperature, frequency, polarization and isotope. In addition to the previously found stable peak, an additional peak is found when the specimen is cooled rapidly. The peak anneals at the same temperature as those found by Hanada in their resistivity quenching experiments, indicating that the quenched-in defect is an OH2 complex. An extension of the model described in Part A is given to account for the relaxation.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-13T16:25:52Z No. of bitstreams: 1 1982_huang.pdf: 3430065 bytes, checksum: ffafb34f7bdb9eea7e716751ea43d37a (MD5)","Made available in DSpace on 2011-06-13T16:25:52Z (GMT). No. of bitstreams: 1 1982_huang.pdf: 3430065 bytes, checksum: ffafb34f7bdb9eea7e716751ea43d37a (MD5) Previous issue date: 1982","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-06-13T16:25:52Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:14:22-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"],"dc:identifier":["18290","http://hdl.handle.net/2142/25397"],"dc:language":["en"],"dc:rights":["1982 Kai-Feng Huang"],"dc:subject":["trapped hydrogen","niobium","interstitial oxygen","BCC metals"],"dc:title":["An ultrasonic study of trapped hydrogen in niobium"],"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"}