{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/21128"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/21128","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Nuclear magnetic resonance investigations of structural phase transitions in silicon dioxide cristobalite and tridymite and related phases","abstract":"This thesis contributes to the application of nuclear magnetic resonance (NMR) techniques in studying structural phase transitions (SPT's) of the SiO$\\sb2$ cristobalite and SiO$\\sb2$ and AlPO$\\sb4$ tridymite polymorphs. The structural properties and SPT's of these phases have been of mineralogical, physical and industrial interest for decades. However, the microscopic characteristics of the SPT's and the origins of the commonly observed structural disorder in the high temperature phases have been poorly known. NMR techniques call provide important information concerning the temperature variation of the short-range structural parameters through SPT's. Moreover, the dynamical behavior of high temperature phases in the NMR frequency range ($\\sim$1-500 MHz) can sometimes be uniquely elucidated by relaxation rate measurements and spectral simulation. The work presented here includes in situ high temperature $\\sp{29}$Si, $\\sp{31}$P and $\\sp{27}$Al NMR results for cristobalite (Chapter II), chemically stabilized $\\beta$-cristobalite (Chapter III), various tridymite polymorphs (MC and PO, Chapter IV; MX-1 Chapter V; AlPO$\\sb4,$ Chapter VI) and a spin-lattice relaxation investigation of the dynamic properties for the high temperature SiO$\\sb2$ and AlPO$\\sb4$ tridymite phases (Chapter VII).","abstract_html":"This thesis contributes to the application of nuclear magnetic resonance (NMR) techniques in studying structural phase transitions (SPT&#x27;s) of the SiO$\\sb2$ cristobalite and SiO$\\sb2$ and AlPO$\\sb4$ tridymite polymorphs. The structural properties and SPT&#x27;s of these phases have been of mineralogical, physical and industrial interest for decades. However, the microscopic characteristics of the SPT&#x27;s and the origins of the commonly observed structural disorder in the high temperature phases have been poorly known. NMR techniques call provide important information concerning the temperature variation of the short-range structural parameters through SPT&#x27;s. Moreover, the dynamical behavior of high temperature phases in the NMR frequency range ($\\sim$1-500 MHz) can sometimes be uniquely elucidated by relaxation rate measurements and spectral simulation. The work presented here includes in situ high temperature $\\sp{29}$Si, $\\sp{31}$P and $\\sp{27}$Al NMR results for cristobalite (Chapter II), chemically stabilized <span class=\"etd-inline-math\">&beta;</span>-cristobalite (Chapter III), various tridymite polymorphs (MC and PO, Chapter IV; MX-1 Chapter V; AlPO$\\sb4,$ Chapter VI) and a spin-lattice relaxation investigation of the dynamic properties for the high temperature SiO$\\sb2$ and AlPO$\\sb4$ tridymite phases (Chapter VII).","abstract_has_math":true,"creators":["Xiao, Yuehui"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Geology","degree_department":null,"school":null,"contributors":["Kirkpatrick, R. James"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T12:59:11Z","date_published":"2011-05-07T12:59:11Z","updated_at":"2026-07-22T22:25:17Z","subjects":["Mineralogy","Chemistry, Inorganic","Physics, Condensed Matter"],"languages":["eng"],"rights":["Copyright 1994 Xiao, Yuehui"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9512603","(UMI)AAI9512603"],"render_values":[{"text":"AAI9512603","href":null,"code":true},{"text":"(UMI)AAI9512603","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/21128","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Kirkpatrick, R. 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The structural properties and SPT's of these phases have been of mineralogical, physical and industrial interest for decades. However, the microscopic characteristics of the SPT's and the origins of the commonly observed structural disorder in the high temperature phases have been poorly known. NMR techniques call provide important information concerning the temperature variation of the short-range structural parameters through SPT's. Moreover, the dynamical behavior of high temperature phases in the NMR frequency range ($\\sim$1-500 MHz) can sometimes be uniquely elucidated by relaxation rate measurements and spectral simulation. The work presented here includes in situ high temperature $\\sp{29}$Si, $\\sp{31}$P and $\\sp{27}$Al NMR results for cristobalite (Chapter II), chemically stabilized $\\beta$-cristobalite (Chapter III), various tridymite polymorphs (MC and PO, Chapter IV; MX-1 Chapter V; AlPO$\\sb4,$ Chapter VI) and a spin-lattice relaxation investigation of the dynamic properties for the high temperature SiO$\\sb2$ and AlPO$\\sb4$ tridymite phases (Chapter VII).","Made available in DSpace on 2011-05-07T12:59:11Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9512603.pdf: 5436214 bytes, checksum: aff4d0e5bd5e5d692beb33431de8d707 (MD5) Previous issue date: 1994","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:48:40Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:22:04-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"]},{"key":"dc:title","label":"Title","values":["Nuclear magnetic resonance investigations of structural phase transitions in silicon dioxide cristobalite and tridymite and related phases"]}]}],"canonical_facts":{"dc:contributor":["Kirkpatrick, R. James"],"dc:creator":["Xiao, Yuehui"],"dc:date":["2011-05-07T12:59:11Z","10000-01-01","1994"],"dc:description":["This thesis contributes to the application of nuclear magnetic resonance (NMR) techniques in studying structural phase transitions (SPT's) of the SiO$\\sb2$ cristobalite and SiO$\\sb2$ and AlPO$\\sb4$ tridymite polymorphs. The structural properties and SPT's of these phases have been of mineralogical, physical and industrial interest for decades. However, the microscopic characteristics of the SPT's and the origins of the commonly observed structural disorder in the high temperature phases have been poorly known. NMR techniques call provide important information concerning the temperature variation of the short-range structural parameters through SPT's. Moreover, the dynamical behavior of high temperature phases in the NMR frequency range ($\\sim$1-500 MHz) can sometimes be uniquely elucidated by relaxation rate measurements and spectral simulation. The work presented here includes in situ high temperature $\\sp{29}$Si, $\\sp{31}$P and $\\sp{27}$Al NMR results for cristobalite (Chapter II), chemically stabilized $\\beta$-cristobalite (Chapter III), various tridymite polymorphs (MC and PO, Chapter IV; MX-1 Chapter V; AlPO$\\sb4,$ Chapter VI) and a spin-lattice relaxation investigation of the dynamic properties for the high temperature SiO$\\sb2$ and AlPO$\\sb4$ tridymite phases (Chapter VII).","Made available in DSpace on 2011-05-07T12:59:11Z (GMT). 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