{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/71707"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/71707","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Microstructure Control and Crystallization Kinetics in Amorphous Cadmium-Germanium - Arsenide (Devitrification, Differential Scanning, Calorimetry)","abstract":"CdGeAs(,2) is a member of the II-IV-V chalcopyrite semiconductor family. The crystallization of the amorphous form of this compound was investigated using Differential Scanning Calorimetry. The basic operating principles of the two currently most popular DSC instruments (the DuPont 1090 DSC and the Perkin-Elmer DSC7) in the context of glass crystallization kinetics are critically evaluated and compared. New analytical methods are introduced for the determination of kinetic parameters of crystallization, modeling to the Avrami and Arrhenius equations; and techniques for optimization of quantitative data from these devices is discussed for both heating rate and isothermal crystallization.","abstract_html":"CdGeAs(,2) is a member of the II-IV-V chalcopyrite semiconductor family. The crystallization of the amorphous form of this compound was investigated using Differential Scanning Calorimetry. The basic operating principles of the two currently most popular DSC instruments (the DuPont 1090 DSC and the Perkin-Elmer DSC7) in the context of glass crystallization kinetics are critically evaluated and compared. New analytical methods are introduced for the determination of kinetic parameters of crystallization, modeling to the Avrami and Arrhenius equations; and techniques for optimization of quantitative data from these devices is discussed for both heating rate and isothermal crystallization.","abstract_has_math":false,"creators":["Speyer, Robert Fredrick"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Ceramics Engineering","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2014,"date_issued":"2014-12-16T19:16:57Z","date_published":"2014-12-16T19:16:57Z","updated_at":"2026-07-22T22:26:05Z","subjects":["Engineering, Materials Science"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(UMI)AAI8623417"],"render_values":[{"text":"(UMI)AAI8623417","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/71707","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Speyer, Robert Fredrick"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2014-12-16T19:16:57Z","10000-01-01","1986"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Ceramics 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/2142/71707","(UMI)AAI8623417"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["CdGeAs(,2) is a member of the II-IV-V chalcopyrite semiconductor family. The crystallization of the amorphous form of this compound was investigated using Differential Scanning Calorimetry. The basic operating principles of the two currently most popular DSC instruments (the DuPont 1090 DSC and the Perkin-Elmer DSC7) in the context of glass crystallization kinetics are critically evaluated and compared. New analytical methods are introduced for the determination of kinetic parameters of crystallization, modeling to the Avrami and Arrhenius equations; and techniques for optimization of quantitative data from these devices is discussed for both heating rate and isothermal crystallization.","The results of X-ray diffraction, DSC, and TEM experiments indicate the nucleation and restricted growth of a precursor crystalline phase just prior to the formation of chalcopyrite structured CdGsAs(,2), which is then postulated to convert chalcopyrite late in the transformation. The precursor crystalline phase is believed to be germanium doped with trace amounts of cadmium and/or arsenic. A hypothesis is proposed using this precursor phase to explain certain observed devitrified microstructures.","Methods of calculating melt quench rates, laser surface crystallization, and a SEM nucleation study, are briefly outlined.","Made available in DSpace on 2014-12-16T19:16:57Z (GMT). No. of bitstreams: 1 8623417.pdf: 7286262 bytes, checksum: b00a601ff98a286f933994f0d866d231 (MD5) Previous issue date: 1986","Embargo set by: Seth Robbins for item 71873 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","251 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1986."]},{"key":"dc:title","label":"Title","values":["Microstructure Control and Crystallization Kinetics in Amorphous Cadmium-Germanium - Arsenide (Devitrification, Differential Scanning, Calorimetry)"]}]}],"canonical_facts":{"dc:creator":["Speyer, Robert Fredrick"],"dc:date":["2014-12-16T19:16:57Z","10000-01-01","1986"],"dc:description":["CdGeAs(,2) is a member of the II-IV-V chalcopyrite semiconductor family. The crystallization of the amorphous form of this compound was investigated using Differential Scanning Calorimetry. The basic operating principles of the two currently most popular DSC instruments (the DuPont 1090 DSC and the Perkin-Elmer DSC7) in the context of glass crystallization kinetics are critically evaluated and compared. New analytical methods are introduced for the determination of kinetic parameters of crystallization, modeling to the Avrami and Arrhenius equations; and techniques for optimization of quantitative data from these devices is discussed for both heating rate and isothermal crystallization.","The results of X-ray diffraction, DSC, and TEM experiments indicate the nucleation and restricted growth of a precursor crystalline phase just prior to the formation of chalcopyrite structured CdGsAs(,2), which is then postulated to convert chalcopyrite late in the transformation. The precursor crystalline phase is believed to be germanium doped with trace amounts of cadmium and/or arsenic. A hypothesis is proposed using this precursor phase to explain certain observed devitrified microstructures.","Methods of calculating melt quench rates, laser surface crystallization, and a SEM nucleation study, are briefly outlined.","Made available in DSpace on 2014-12-16T19:16:57Z (GMT). No. of bitstreams: 1 8623417.pdf: 7286262 bytes, checksum: b00a601ff98a286f933994f0d866d231 (MD5) Previous issue date: 1986","Embargo set by: Seth Robbins for item 71873 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","251 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1986."],"dc:identifier":["http://hdl.handle.net/2142/71707","(UMI)AAI8623417"],"dc:subject":["Engineering, Materials Science"],"dc:title":["Microstructure Control and Crystallization Kinetics in Amorphous Cadmium-Germanium - Arsenide (Devitrification, Differential Scanning, Calorimetry)"],"dc:type":["text"],"thesis:degree_discipline":["Ceramics 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"}