{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/71825"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/71825","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Grain Boundary Structure in Alumina","abstract":"Grain boundary microstructures in alumina ceramics are prone to show glassy phases, faceting, and some fraction of highly coincident twin-related boundaries. These separate phenomena and their inter- actions have been studied in six distinct materials of both commer- cial and experimental origin. Glass containing materials show high density of (SIGMA) = 3 basal twins and few others. Some hot pressed materials show, in addition to basal twins, (SIGMA) = 7 rhombohedral twins and two distinct varieties of 10(')11 twins new to alumina. All these boundaries are analyzed using the CSL/DSCL model and an idealized axial ratio c/a = SQRT.(15/2); 0 lattice methods are employed to estimate the error introduced by that idealization. The basal and rhombohedral twins seem well-described by the model, while the 10(')11 ones show unexpected displacements from coincident geometries.","abstract_html":"Grain boundary microstructures in alumina ceramics are prone to show glassy phases, faceting, and some fraction of highly coincident twin-related boundaries. These separate phenomena and their inter- actions have been studied in six distinct materials of both commer- cial and experimental origin. Glass containing materials show high density of (SIGMA) = 3 basal twins and few others. Some hot pressed materials show, in addition to basal twins, (SIGMA) = 7 rhombohedral twins and two distinct varieties of 10(')11 twins new to alumina. All these boundaries are analyzed using the CSL/DSCL model and an idealized axial ratio c/a = SQRT.(15/2); 0 lattice methods are employed to estimate the error introduced by that idealization. The basal and rhombohedral twins seem well-described by the model, while the 10(')11 ones show unexpected displacements from coincident geometries.","abstract_has_math":false,"creators":["Shiue, Yeong Ruey"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Metallurgical Engineering","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2014,"date_issued":"2014-12-16T20:52:03Z","date_published":"2014-12-16T20:52:03Z","updated_at":"2026-07-22T22:26:05Z","subjects":["Engineering, Materials Science"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(UMI)AAI8600313"],"render_values":[{"text":"(UMI)AAI8600313","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/71825","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Shiue, Yeong Ruey"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2014-12-16T20:52:03Z","10000-01-01","1985"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Metallurgical Engineering"]},{"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":["Engineering, Materials Science"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/71825","(UMI)AAI8600313"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Grain boundary microstructures in alumina ceramics are prone to show glassy phases, faceting, and some fraction of highly coincident twin-related boundaries. These separate phenomena and their inter- actions have been studied in six distinct materials of both commer- cial and experimental origin. Glass containing materials show high density of (SIGMA) = 3 basal twins and few others. Some hot pressed materials show, in addition to basal twins, (SIGMA) = 7 rhombohedral twins and two distinct varieties of 10(')11 twins new to alumina. All these boundaries are analyzed using the CSL/DSCL model and an idealized axial ratio c/a = SQRT.(15/2); 0 lattice methods are employed to estimate the error introduced by that idealization. The basal and rhombohedral twins seem well-described by the model, while the 10(')11 ones show unexpected displacements from coincident geometries.","Made available in DSpace on 2014-12-16T20:52:03Z (GMT). No. of bitstreams: 1 8600313.pdf: 3723646 bytes, checksum: 02347b1f134b87a84aba36dc0752bb4b (MD5) Previous issue date: 1985","Embargo set by: Seth Robbins for item 71991 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","128 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1985."]},{"key":"dc:title","label":"Title","values":["Grain Boundary Structure in Alumina"]}]}],"canonical_facts":{"dc:creator":["Shiue, Yeong Ruey"],"dc:date":["2014-12-16T20:52:03Z","10000-01-01","1985"],"dc:description":["Grain boundary microstructures in alumina ceramics are prone to show glassy phases, faceting, and some fraction of highly coincident twin-related boundaries. These separate phenomena and their inter- actions have been studied in six distinct materials of both commer- cial and experimental origin. Glass containing materials show high density of (SIGMA) = 3 basal twins and few others. Some hot pressed materials show, in addition to basal twins, (SIGMA) = 7 rhombohedral twins and two distinct varieties of 10(')11 twins new to alumina. All these boundaries are analyzed using the CSL/DSCL model and an idealized axial ratio c/a = SQRT.(15/2); 0 lattice methods are employed to estimate the error introduced by that idealization. The basal and rhombohedral twins seem well-described by the model, while the 10(')11 ones show unexpected displacements from coincident geometries.","Made available in DSpace on 2014-12-16T20:52:03Z (GMT). No. of bitstreams: 1 8600313.pdf: 3723646 bytes, checksum: 02347b1f134b87a84aba36dc0752bb4b (MD5) Previous issue date: 1985","Embargo set by: Seth Robbins for item 71991 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","128 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1985."],"dc:identifier":["http://hdl.handle.net/2142/71825","(UMI)AAI8600313"],"dc:subject":["Engineering, Materials Science"],"dc:title":["Grain Boundary Structure in Alumina"],"dc:type":["text"],"thesis:degree_discipline":["Metallurgical Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:26:05Z"}