{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/19284"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/19284","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Processing and phase stability of metal carboxylate-derived barium-yttrium-copper oxide thin films","abstract":"The processing and phase stability of Ba$\\sb2$YCu$\\sb3$O$\\sb{\\rm 7-x}$ High T$\\sb{\\rm c}$ thin films are seen to be critical aspects of the successful fabrication of this material. Metal neodecanoates of barium, yttrium, and copper were synthesized and mixed into a homogeneous, precipitate-free solution, which was spin-cast onto ZrO$\\sb2$ coated silicon wafers. A minimum heat treated temperature of 725$\\sp\\circ$C in N$\\sb2$ was needed to decompose the BaCO$\\sb3$ present in the films. A phase map of the stability of Ba$\\sb2$YCu$\\sb3$O$\\sb{\\rm 7-x}$ as a function of heat treatment temperature and ambient showed both the upper and lower temperature boundaries to increase with decreasing P$\\sb{\\rm O2}$, with the higher temperature boundary truncated at temperatures $>$800$\\sp\\circ$C from interdiffusion of the films with the substrate. The high temperature decomposition mechanism for the high P$\\sb{\\rm O2}$ condition was seen to be nucleation of BaCuO$\\sb2$, followed by formation of BaY$\\sb2$CuO$\\sb5$, the accelerated formation of which was attributed to the small grain size ($$90 K was accounted for by the presence of the weak links in the film microstructure.","abstract_html":"The processing and phase stability of Ba$\\sb2$YCu$\\sb3$O$\\sb{\\rm 7-x}$ High T$\\sb{\\rm c}$ thin films are seen to be critical aspects of the successful fabrication of this material. Metal neodecanoates of barium, yttrium, and copper were synthesized and mixed into a homogeneous, precipitate-free solution, which was spin-cast onto ZrO$\\sb2$ coated silicon wafers. A minimum heat treated temperature of 725$\\sp\\circ$C in N$\\sb2$ was needed to decompose the BaCO$\\sb3$ present in the films. A phase map of the stability of Ba$\\sb2$YCu$\\sb3$O$\\sb{\\rm 7-x}$ as a function of heat treatment temperature and ambient showed both the upper and lower temperature boundaries to increase with decreasing P$\\sb{\\rm O2}$, with the higher temperature boundary truncated at temperatures $>$800$\\sp\\circ$C from interdiffusion of the films with the substrate. The high temperature decomposition mechanism for the high P$\\sb{\\rm O2}$ condition was seen to be nucleation of BaCuO$\\sb2$, followed by formation of BaY$\\sb2$CuO$\\sb5$, the accelerated formation of which was attributed to the small grain size ($$90 K was accounted for by the presence of the weak links in the film microstructure.","abstract_has_math":true,"creators":["Davison, William Watson"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Ceramic Engineering","degree_department":null,"school":null,"contributors":["Buchanan, Relva C."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T12:02:45Z","date_published":"2011-05-07T12:02:45Z","updated_at":"2026-07-22T22:25:12Z","subjects":["Engineering, Materials Science"],"languages":["eng"],"rights":["Copyright 1990 Davison, William Watson"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9021668","(UMI)AAI9021668"],"render_values":[{"text":"AAI9021668","href":null,"code":true},{"text":"(UMI)AAI9021668","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/19284","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Buchanan, Relva C."]},{"key":"dc:creator","label":"Author","values":["Davison, William Watson"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T12:02:45Z","10000-01-01","1990"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Ceramic 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":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1990 Davison, William Watson"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9021668","(UMI)AAI9021668","http://hdl.handle.net/2142/19284"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The processing and phase stability of Ba$\\sb2$YCu$\\sb3$O$\\sb{\\rm 7-x}$ High T$\\sb{\\rm c}$ thin films are seen to be critical aspects of the successful fabrication of this material. Metal neodecanoates of barium, yttrium, and copper were synthesized and mixed into a homogeneous, precipitate-free solution, which was spin-cast onto ZrO$\\sb2$ coated silicon wafers. A minimum heat treated temperature of 725$\\sp\\circ$C in N$\\sb2$ was needed to decompose the BaCO$\\sb3$ present in the films. A phase map of the stability of Ba$\\sb2$YCu$\\sb3$O$\\sb{\\rm 7-x}$ as a function of heat treatment temperature and ambient showed both the upper and lower temperature boundaries to increase with decreasing P$\\sb{\\rm O2}$, with the higher temperature boundary truncated at temperatures $>$800$\\sp\\circ$C from interdiffusion of the films with the substrate. The high temperature decomposition mechanism for the high P$\\sb{\\rm O2}$ condition was seen to be nucleation of BaCuO$\\sb2$, followed by formation of BaY$\\sb2$CuO$\\sb5$, the accelerated formation of which was attributed to the small grain size ($$90 K was accounted for by the presence of the weak links in the film microstructure.","Made available in DSpace on 2011-05-07T12:02:45Z (GMT). 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Metal neodecanoates of barium, yttrium, and copper were synthesized and mixed into a homogeneous, precipitate-free solution, which was spin-cast onto ZrO$\\sb2$ coated silicon wafers. A minimum heat treated temperature of 725$\\sp\\circ$C in N$\\sb2$ was needed to decompose the BaCO$\\sb3$ present in the films. A phase map of the stability of Ba$\\sb2$YCu$\\sb3$O$\\sb{\\rm 7-x}$ as a function of heat treatment temperature and ambient showed both the upper and lower temperature boundaries to increase with decreasing P$\\sb{\\rm O2}$, with the higher temperature boundary truncated at temperatures $>$800$\\sp\\circ$C from interdiffusion of the films with the substrate. The high temperature decomposition mechanism for the high P$\\sb{\\rm O2}$ condition was seen to be nucleation of BaCuO$\\sb2$, followed by formation of BaY$\\sb2$CuO$\\sb5$, the accelerated formation of which was attributed to the small grain size ($$90 K was accounted for by the presence of the weak links in the film microstructure.","Made available in DSpace on 2011-05-07T12:02:45Z (GMT). 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