{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/84370"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/84370","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Magnetic Resonance Studies of Inorganic Oxides and a New Pulse Programming System for Pulsed EMR","abstract":"We have investigated several inorganic oxide systems using nuclear and electron magnetic resonance spectroscopies and also report a new pulse programming system for a pulsed S-band EMR spectrometer. We show in a study of simple perovskites (Ca,Sr,Ba)(Ti,Zr) O$\\sb3$ that magic-angle spinning O-17 NMR provides unique, highly-resolved spectra in these materials and gives evidence of being useful as a diagnostic tool in mixed phase materials (A$\\sb{x}A\\sbsp{1-x}{\\prime})$BO$\\sb3.$ Various used NMR and EMR techniques to study of the commercial borosilicate glasses CGW-3320, CGW-7502, CGW-7740 (Pyrex) and GSC-4, and T-08 (pure silica glass) which had received 5-10 gigarad doses of Co-60 gamma-radiation in the presence and absence of hydrogen gas. We show that B-11, Al-27 and Si-29 MAS NMR spectra contain indications of structural changes in these glasses as a result of large doses of radiation. We also observed the reduction of trace Ti(IV) to Ti(III) when H$\\sb2$ gas was present during irradiation of glass samples. Static NMR and EMR studies in the (Na,Li)PO$\\sb3$ system indicate a possible mixed alkali effect in the spin-lattice relaxation of Na-23 in NaPO$\\sb3$ and Li$\\rm\\sb{0.4}Na\\sb{0.6}PO\\sb3.$ Static Na-23 NMR studies of NaPO$\\sb3$ reveal the presence of different structural or dynamical environments as a function of temperatures between 23-566 C. We have investigated glass and glass fibers of Li$\\rm\\sb{0.6}Na\\sb{0.4}PO\\sb3$ and Na(P$\\rm\\sb{0.99},V\\sb{0.01})O\\sb3,$ and show P-31 NMR and EMR evidence that these materials remained structurally isotropic when pulled into fibers. We show that vanadium (in Na(P$\\rm\\sb{0.99},V\\sb{0.01})O\\sb3)$ appears to suppress radiolytic unpaired electron and hole defect production which does take place in nominally vanadium-free NaPO$\\sb3$ during small doses of gamma-radiation. We describe hardware and software developed for a pulse programming system for a pulsed S-band EMR spectrometer. This system supports user-programmable automatic independent control of all pulse sequence parameters (pulse and delay durations, and pulse phases). We demonstrate the capabilities of this new system in 2-, 3-, and 4-pulse EMR experiments, and also demonstrate a new software suite for interactive simulation and simulation optimization of electron spin echo envelope modulation (ESEEM) patterns using a genetic algorithm.","abstract_html":"We have investigated several inorganic oxide systems using nuclear and electron magnetic resonance spectroscopies and also report a new pulse programming system for a pulsed S-band EMR spectrometer. We show in a study of simple perovskites (Ca,Sr,Ba)(Ti,Zr) O$\\sb3$ that magic-angle spinning O-17 NMR provides unique, highly-resolved spectra in these materials and gives evidence of being useful as a diagnostic tool in mixed phase materials (A$\\sb{x}A\\sbsp{1-x}{\\prime})$BO$\\sb3.$ Various used NMR and EMR techniques to study of the commercial borosilicate glasses CGW-3320, CGW-7502, CGW-7740 (Pyrex) and GSC-4, and T-08 (pure silica glass) which had received 5-10 gigarad doses of Co-60 gamma-radiation in the presence and absence of hydrogen gas. We show that B-11, Al-27 and Si-29 MAS NMR spectra contain indications of structural changes in these glasses as a result of large doses of radiation. We also observed the reduction of trace Ti(IV) to Ti(III) when H$\\sb2$ gas was present during irradiation of glass samples. Static NMR and EMR studies in the (Na,Li)PO$\\sb3$ system indicate a possible mixed alkali effect in the spin-lattice relaxation of Na-23 in NaPO$\\sb3$ and Li$\\rm\\sb{0.4}Na\\sb{0.6}PO\\sb3.$ Static Na-23 NMR studies of NaPO$\\sb3$ reveal the presence of different structural or dynamical environments as a function of temperatures between 23-566 C. We have investigated glass and glass fibers of Li$\\rm\\sb{0.6}Na\\sb{0.4}PO\\sb3$ and Na(P$\\rm\\sb{0.99},V\\sb{0.01})O\\sb3,$ and show P-31 NMR and EMR evidence that these materials remained structurally isotropic when pulled into fibers. We show that vanadium (in Na(P$\\rm\\sb{0.99},V\\sb{0.01})O\\sb3)$ appears to suppress radiolytic unpaired electron and hole defect production which does take place in nominally vanadium-free NaPO$\\sb3$ during small doses of gamma-radiation. We describe hardware and software developed for a pulse programming system for a pulsed S-band EMR spectrometer. This system supports user-programmable automatic independent control of all pulse sequence parameters (pulse and delay durations, and pulse phases). We demonstrate the capabilities of this new system in 2-, 3-, and 4-pulse EMR experiments, and also demonstrate a new software suite for interactive simulation and simulation optimization of electron spin echo envelope modulation (ESEEM) patterns using a genetic algorithm.","abstract_has_math":true,"creators":["Schwartz, Dwight Allen"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Chemical Physics","degree_department":null,"school":null,"contributors":["Belford, R. Linn"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-25T22:14:10Z","date_published":"2015-09-25T22:14:10Z","updated_at":"2026-07-22T22:26:23Z","subjects":["Engineering, Materials Science"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(MiAaPQ)AAI9737245"],"render_values":[{"text":"(MiAaPQ)AAI9737245","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/84370","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Belford, R. 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We show in a study of simple perovskites (Ca,Sr,Ba)(Ti,Zr) O$\\sb3$ that magic-angle spinning O-17 NMR provides unique, highly-resolved spectra in these materials and gives evidence of being useful as a diagnostic tool in mixed phase materials (A$\\sb{x}A\\sbsp{1-x}{\\prime})$BO$\\sb3.$ Various used NMR and EMR techniques to study of the commercial borosilicate glasses CGW-3320, CGW-7502, CGW-7740 (Pyrex) and GSC-4, and T-08 (pure silica glass) which had received 5-10 gigarad doses of Co-60 gamma-radiation in the presence and absence of hydrogen gas. We show that B-11, Al-27 and Si-29 MAS NMR spectra contain indications of structural changes in these glasses as a result of large doses of radiation. We also observed the reduction of trace Ti(IV) to Ti(III) when H$\\sb2$ gas was present during irradiation of glass samples. Static NMR and EMR studies in the (Na,Li)PO$\\sb3$ system indicate a possible mixed alkali effect in the spin-lattice relaxation of Na-23 in NaPO$\\sb3$ and Li$\\rm\\sb{0.4}Na\\sb{0.6}PO\\sb3.$ Static Na-23 NMR studies of NaPO$\\sb3$ reveal the presence of different structural or dynamical environments as a function of temperatures between 23-566 C. We have investigated glass and glass fibers of Li$\\rm\\sb{0.6}Na\\sb{0.4}PO\\sb3$ and Na(P$\\rm\\sb{0.99},V\\sb{0.01})O\\sb3,$ and show P-31 NMR and EMR evidence that these materials remained structurally isotropic when pulled into fibers. We show that vanadium (in Na(P$\\rm\\sb{0.99},V\\sb{0.01})O\\sb3)$ appears to suppress radiolytic unpaired electron and hole defect production which does take place in nominally vanadium-free NaPO$\\sb3$ during small doses of gamma-radiation. We describe hardware and software developed for a pulse programming system for a pulsed S-band EMR spectrometer. This system supports user-programmable automatic independent control of all pulse sequence parameters (pulse and delay durations, and pulse phases). We demonstrate the capabilities of this new system in 2-, 3-, and 4-pulse EMR experiments, and also demonstrate a new software suite for interactive simulation and simulation optimization of electron spin echo envelope modulation (ESEEM) patterns using a genetic algorithm.","Made available in DSpace on 2015-09-25T22:14:10Z (GMT). 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Linn"],"dc:creator":["Schwartz, Dwight Allen"],"dc:date":["2015-09-25T22:14:10Z","10000-01-01","1997"],"dc:description":["We have investigated several inorganic oxide systems using nuclear and electron magnetic resonance spectroscopies and also report a new pulse programming system for a pulsed S-band EMR spectrometer. We show in a study of simple perovskites (Ca,Sr,Ba)(Ti,Zr) O$\\sb3$ that magic-angle spinning O-17 NMR provides unique, highly-resolved spectra in these materials and gives evidence of being useful as a diagnostic tool in mixed phase materials (A$\\sb{x}A\\sbsp{1-x}{\\prime})$BO$\\sb3.$ Various used NMR and EMR techniques to study of the commercial borosilicate glasses CGW-3320, CGW-7502, CGW-7740 (Pyrex) and GSC-4, and T-08 (pure silica glass) which had received 5-10 gigarad doses of Co-60 gamma-radiation in the presence and absence of hydrogen gas. We show that B-11, Al-27 and Si-29 MAS NMR spectra contain indications of structural changes in these glasses as a result of large doses of radiation. We also observed the reduction of trace Ti(IV) to Ti(III) when H$\\sb2$ gas was present during irradiation of glass samples. Static NMR and EMR studies in the (Na,Li)PO$\\sb3$ system indicate a possible mixed alkali effect in the spin-lattice relaxation of Na-23 in NaPO$\\sb3$ and Li$\\rm\\sb{0.4}Na\\sb{0.6}PO\\sb3.$ Static Na-23 NMR studies of NaPO$\\sb3$ reveal the presence of different structural or dynamical environments as a function of temperatures between 23-566 C. We have investigated glass and glass fibers of Li$\\rm\\sb{0.6}Na\\sb{0.4}PO\\sb3$ and Na(P$\\rm\\sb{0.99},V\\sb{0.01})O\\sb3,$ and show P-31 NMR and EMR evidence that these materials remained structurally isotropic when pulled into fibers. We show that vanadium (in Na(P$\\rm\\sb{0.99},V\\sb{0.01})O\\sb3)$ appears to suppress radiolytic unpaired electron and hole defect production which does take place in nominally vanadium-free NaPO$\\sb3$ during small doses of gamma-radiation. We describe hardware and software developed for a pulse programming system for a pulsed S-band EMR spectrometer. This system supports user-programmable automatic independent control of all pulse sequence parameters (pulse and delay durations, and pulse phases). We demonstrate the capabilities of this new system in 2-, 3-, and 4-pulse EMR experiments, and also demonstrate a new software suite for interactive simulation and simulation optimization of electron spin echo envelope modulation (ESEEM) patterns using a genetic algorithm.","Made available in DSpace on 2015-09-25T22:14:10Z (GMT). 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