Magnetic resonance study of a vanadium pentoxide gel
In this work we report results from continuous-wave (CW) and pulsed electron paramagnetic resonance (EPR) and proton nuclear magnetic resonance (NMR) studies of the vanadium pentoxide xerogel V 2 O 5 : n H 2 O ( n ≈ 1.6). The low temperature CW-EPR spectrum shows hyperfine structure due to coupling...
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| Veröffentlicht in: | Journal of sol-gel science and technology 2008-02, Vol.45 (2), p.195-204 |
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| creator | Nascimento, Otaciro R. Magon, Claudio J. Lima, Jose Fernando Donoso, Jose Pedro Benavente, Eglantina Paez, Jaime Lavayen, Vladimir Santa Ana, Maria Angelica Gonzalez, Guillermo |
| description | In this work we report results from continuous-wave (CW) and pulsed electron paramagnetic resonance (EPR) and proton nuclear magnetic resonance (NMR) studies of the vanadium pentoxide xerogel V
2
O
5
:
n
H
2
O (
n
≈ 1.6). The low temperature CW-EPR spectrum shows hyperfine structure due to coupling of unpaired V
4+
electron with the vanadium nucleus. The analysis of the spin Hamiltonian parameters suggests that the V
4+
ions are located in tetragonally distorted octahedral sites. The transition temperature from the rigid-lattice low-temperature regime to the high temperature liquid-like regime was determined from the analysis of the temperature dependence of the hyperfine splitting and the V
4+
motional correlation time. The Electron Spin Echo Envelope Modulation (ESEEM) data shows the signals resulting from the interaction of
1
H nuclei with V
4+
ions. The modulation effect was observed only for field values in the center of the EPR absorption spectrum corresponding to the single crystals orientated perpendicular to the magnetic field direction. At least three protons are identified in the xerogel by our magnetic resonance experiments: (I) the OH groups in the equatorial plane, (ii) the bound water molecules in the axial V=O bond and (iii) the free mobile water molecules between the oxide layers. Proton NMR lineshapes and spin-lattice relaxation times were measured in the temperature range between 150 K and 323 K. Our analysis indicates that only a fraction of the xerogel protons contribute to the measured conductivity. |
| doi_str_mv | 10.1007/s10971-007-1663-2 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_miscellaneous_32070922</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>2259561849</sourcerecordid><originalsourceid>FETCH-LOGICAL-c377t-7a67f525de7f30917f802cef76435fb121aff692312d97a2337627d82ca3406f3</originalsourceid><addsrcrecordid>eNp1kE9LxDAQxYMouK5-AG8F0Vs0mbSZ5iiL_2DFi55DTJOlSzddk1bcb29rRUHwNA_mN483j5BTzi45Y3iVOFPI6SApl1JQ2CMzXqCgeZnLfTJjCkrKkOEhOUppzRgrco4zkj-aVXBdbbPoUhtMsC5LXV_tstZnJns3wVR1v8m2LnTtR125bOWaY3LgTZPcyfeck5fbm-fFPV0-3T0srpfUCsSOopHoCygqh14wxdGXDKzzKHNR-FcO3HgvFQgOlUIDQqAErEqwRuRMejEnF5PvNrZvvUud3tTJuqYxwbV90gKGjxTAAJ79AddtH8OQTQMUqpC8zNVA8YmysU0pOq-3sd6YuNOc6bFFPbWoRzm2qEfn829nk6xpfBwaqtPPITCOpfhKABOXhlVYufib4H_zTzxgfyI</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>2259561849</pqid></control><display><type>article</type><title>Magnetic resonance study of a vanadium pentoxide gel</title><source>SpringerLink Journals</source><creator>Nascimento, Otaciro R. ; Magon, Claudio J. ; Lima, Jose Fernando ; Donoso, Jose Pedro ; Benavente, Eglantina ; Paez, Jaime ; Lavayen, Vladimir ; Santa Ana, Maria Angelica ; Gonzalez, Guillermo</creator><creatorcontrib>Nascimento, Otaciro R. ; Magon, Claudio J. ; Lima, Jose Fernando ; Donoso, Jose Pedro ; Benavente, Eglantina ; Paez, Jaime ; Lavayen, Vladimir ; Santa Ana, Maria Angelica ; Gonzalez, Guillermo</creatorcontrib><description>In this work we report results from continuous-wave (CW) and pulsed electron paramagnetic resonance (EPR) and proton nuclear magnetic resonance (NMR) studies of the vanadium pentoxide xerogel V
2
O
5
:
n
H
2
O (
n
≈ 1.6). The low temperature CW-EPR spectrum shows hyperfine structure due to coupling of unpaired V
4+
electron with the vanadium nucleus. The analysis of the spin Hamiltonian parameters suggests that the V
4+
ions are located in tetragonally distorted octahedral sites. The transition temperature from the rigid-lattice low-temperature regime to the high temperature liquid-like regime was determined from the analysis of the temperature dependence of the hyperfine splitting and the V
4+
motional correlation time. The Electron Spin Echo Envelope Modulation (ESEEM) data shows the signals resulting from the interaction of
1
H nuclei with V
4+
ions. The modulation effect was observed only for field values in the center of the EPR absorption spectrum corresponding to the single crystals orientated perpendicular to the magnetic field direction. At least three protons are identified in the xerogel by our magnetic resonance experiments: (I) the OH groups in the equatorial plane, (ii) the bound water molecules in the axial V=O bond and (iii) the free mobile water molecules between the oxide layers. Proton NMR lineshapes and spin-lattice relaxation times were measured in the temperature range between 150 K and 323 K. Our analysis indicates that only a fraction of the xerogel protons contribute to the measured conductivity.</description><identifier>ISSN: 0928-0707</identifier><identifier>EISSN: 1573-4846</identifier><identifier>DOI: 10.1007/s10971-007-1663-2</identifier><language>eng</language><publisher>Boston: Springer US</publisher><subject>Absorption spectra ; Ceramics ; Chemistry ; Chemistry and Materials Science ; Colloidal gels. Colloidal sols ; Colloidal state and disperse state ; Composites ; Continuous radiation ; Coupling (molecular) ; Crystal structure ; Electron paramagnetic resonance ; Electron spin ; Electrons ; Exact sciences and technology ; General and physical chemistry ; Glass ; High temperature ; Hyperfine structure ; Inorganic Chemistry ; Materials Science ; Modulation ; Nanotechnology ; Natural Materials ; NMR ; Nuclear magnetic resonance ; Nuclei (nuclear physics) ; Optical and Electronic Materials ; Original Paper ; Single crystals ; Spin-lattice relaxation ; Temperature dependence ; Transition temperature ; Vanadium pentoxide ; Water chemistry</subject><ispartof>Journal of sol-gel science and technology, 2008-02, Vol.45 (2), p.195-204</ispartof><rights>Springer Science+Business Media, LLC 2007</rights><rights>2008 INIST-CNRS</rights><rights>Journal of Sol-Gel Science and Technology is a copyright of Springer, (2007). All Rights Reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c377t-7a67f525de7f30917f802cef76435fb121aff692312d97a2337627d82ca3406f3</citedby><cites>FETCH-LOGICAL-c377t-7a67f525de7f30917f802cef76435fb121aff692312d97a2337627d82ca3406f3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s10971-007-1663-2$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s10971-007-1663-2$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,780,784,27924,27925,41488,42557,51319</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=20178322$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Nascimento, Otaciro R.</creatorcontrib><creatorcontrib>Magon, Claudio J.</creatorcontrib><creatorcontrib>Lima, Jose Fernando</creatorcontrib><creatorcontrib>Donoso, Jose Pedro</creatorcontrib><creatorcontrib>Benavente, Eglantina</creatorcontrib><creatorcontrib>Paez, Jaime</creatorcontrib><creatorcontrib>Lavayen, Vladimir</creatorcontrib><creatorcontrib>Santa Ana, Maria Angelica</creatorcontrib><creatorcontrib>Gonzalez, Guillermo</creatorcontrib><title>Magnetic resonance study of a vanadium pentoxide gel</title><title>Journal of sol-gel science and technology</title><addtitle>J Sol-Gel Sci Technol</addtitle><description>In this work we report results from continuous-wave (CW) and pulsed electron paramagnetic resonance (EPR) and proton nuclear magnetic resonance (NMR) studies of the vanadium pentoxide xerogel V
2
O
5
:
n
H
2
O (
n
≈ 1.6). The low temperature CW-EPR spectrum shows hyperfine structure due to coupling of unpaired V
4+
electron with the vanadium nucleus. The analysis of the spin Hamiltonian parameters suggests that the V
4+
ions are located in tetragonally distorted octahedral sites. The transition temperature from the rigid-lattice low-temperature regime to the high temperature liquid-like regime was determined from the analysis of the temperature dependence of the hyperfine splitting and the V
4+
motional correlation time. The Electron Spin Echo Envelope Modulation (ESEEM) data shows the signals resulting from the interaction of
1
H nuclei with V
4+
ions. The modulation effect was observed only for field values in the center of the EPR absorption spectrum corresponding to the single crystals orientated perpendicular to the magnetic field direction. At least three protons are identified in the xerogel by our magnetic resonance experiments: (I) the OH groups in the equatorial plane, (ii) the bound water molecules in the axial V=O bond and (iii) the free mobile water molecules between the oxide layers. Proton NMR lineshapes and spin-lattice relaxation times were measured in the temperature range between 150 K and 323 K. Our analysis indicates that only a fraction of the xerogel protons contribute to the measured conductivity.</description><subject>Absorption spectra</subject><subject>Ceramics</subject><subject>Chemistry</subject><subject>Chemistry and Materials Science</subject><subject>Colloidal gels. Colloidal sols</subject><subject>Colloidal state and disperse state</subject><subject>Composites</subject><subject>Continuous radiation</subject><subject>Coupling (molecular)</subject><subject>Crystal structure</subject><subject>Electron paramagnetic resonance</subject><subject>Electron spin</subject><subject>Electrons</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><subject>Glass</subject><subject>High temperature</subject><subject>Hyperfine structure</subject><subject>Inorganic Chemistry</subject><subject>Materials Science</subject><subject>Modulation</subject><subject>Nanotechnology</subject><subject>Natural Materials</subject><subject>NMR</subject><subject>Nuclear magnetic resonance</subject><subject>Nuclei (nuclear physics)</subject><subject>Optical and Electronic Materials</subject><subject>Original Paper</subject><subject>Single crystals</subject><subject>Spin-lattice relaxation</subject><subject>Temperature dependence</subject><subject>Transition temperature</subject><subject>Vanadium pentoxide</subject><subject>Water chemistry</subject><issn>0928-0707</issn><issn>1573-4846</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2008</creationdate><recordtype>article</recordtype><sourceid>AFKRA</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNp1kE9LxDAQxYMouK5-AG8F0Vs0mbSZ5iiL_2DFi55DTJOlSzddk1bcb29rRUHwNA_mN483j5BTzi45Y3iVOFPI6SApl1JQ2CMzXqCgeZnLfTJjCkrKkOEhOUppzRgrco4zkj-aVXBdbbPoUhtMsC5LXV_tstZnJns3wVR1v8m2LnTtR125bOWaY3LgTZPcyfeck5fbm-fFPV0-3T0srpfUCsSOopHoCygqh14wxdGXDKzzKHNR-FcO3HgvFQgOlUIDQqAErEqwRuRMejEnF5PvNrZvvUud3tTJuqYxwbV90gKGjxTAAJ79AddtH8OQTQMUqpC8zNVA8YmysU0pOq-3sd6YuNOc6bFFPbWoRzm2qEfn829nk6xpfBwaqtPPITCOpfhKABOXhlVYufib4H_zTzxgfyI</recordid><startdate>20080201</startdate><enddate>20080201</enddate><creator>Nascimento, Otaciro R.</creator><creator>Magon, Claudio J.</creator><creator>Lima, Jose Fernando</creator><creator>Donoso, Jose Pedro</creator><creator>Benavente, Eglantina</creator><creator>Paez, Jaime</creator><creator>Lavayen, Vladimir</creator><creator>Santa Ana, Maria Angelica</creator><creator>Gonzalez, Guillermo</creator><general>Springer US</general><general>Springer</general><general>Springer Nature B.V</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>AFKRA</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>KB.</scope><scope>L6V</scope><scope>M7S</scope><scope>PDBOC</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope><scope>7U5</scope><scope>8FD</scope><scope>L7M</scope></search><sort><creationdate>20080201</creationdate><title>Magnetic resonance study of a vanadium pentoxide gel</title><author>Nascimento, Otaciro R. ; Magon, Claudio J. ; Lima, Jose Fernando ; Donoso, Jose Pedro ; Benavente, Eglantina ; Paez, Jaime ; Lavayen, Vladimir ; Santa Ana, Maria Angelica ; Gonzalez, Guillermo</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c377t-7a67f525de7f30917f802cef76435fb121aff692312d97a2337627d82ca3406f3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2008</creationdate><topic>Absorption spectra</topic><topic>Ceramics</topic><topic>Chemistry</topic><topic>Chemistry and Materials Science</topic><topic>Colloidal gels. Colloidal sols</topic><topic>Colloidal state and disperse state</topic><topic>Composites</topic><topic>Continuous radiation</topic><topic>Coupling (molecular)</topic><topic>Crystal structure</topic><topic>Electron paramagnetic resonance</topic><topic>Electron spin</topic><topic>Electrons</topic><topic>Exact sciences and technology</topic><topic>General and physical chemistry</topic><topic>Glass</topic><topic>High temperature</topic><topic>Hyperfine structure</topic><topic>Inorganic Chemistry</topic><topic>Materials Science</topic><topic>Modulation</topic><topic>Nanotechnology</topic><topic>Natural Materials</topic><topic>NMR</topic><topic>Nuclear magnetic resonance</topic><topic>Nuclei (nuclear physics)</topic><topic>Optical and Electronic Materials</topic><topic>Original Paper</topic><topic>Single crystals</topic><topic>Spin-lattice relaxation</topic><topic>Temperature dependence</topic><topic>Transition temperature</topic><topic>Vanadium pentoxide</topic><topic>Water chemistry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Nascimento, Otaciro R.</creatorcontrib><creatorcontrib>Magon, Claudio J.</creatorcontrib><creatorcontrib>Lima, Jose Fernando</creatorcontrib><creatorcontrib>Donoso, Jose Pedro</creatorcontrib><creatorcontrib>Benavente, Eglantina</creatorcontrib><creatorcontrib>Paez, Jaime</creatorcontrib><creatorcontrib>Lavayen, Vladimir</creatorcontrib><creatorcontrib>Santa Ana, Maria Angelica</creatorcontrib><creatorcontrib>Gonzalez, Guillermo</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Materials Science Collection</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>Materials Science Database</collection><collection>ProQuest Engineering Collection</collection><collection>Engineering Database</collection><collection>Materials Science Collection</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Engineering Collection</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of sol-gel science and technology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Nascimento, Otaciro R.</au><au>Magon, Claudio J.</au><au>Lima, Jose Fernando</au><au>Donoso, Jose Pedro</au><au>Benavente, Eglantina</au><au>Paez, Jaime</au><au>Lavayen, Vladimir</au><au>Santa Ana, Maria Angelica</au><au>Gonzalez, Guillermo</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Magnetic resonance study of a vanadium pentoxide gel</atitle><jtitle>Journal of sol-gel science and technology</jtitle><stitle>J Sol-Gel Sci Technol</stitle><date>2008-02-01</date><risdate>2008</risdate><volume>45</volume><issue>2</issue><spage>195</spage><epage>204</epage><pages>195-204</pages><issn>0928-0707</issn><eissn>1573-4846</eissn><abstract>In this work we report results from continuous-wave (CW) and pulsed electron paramagnetic resonance (EPR) and proton nuclear magnetic resonance (NMR) studies of the vanadium pentoxide xerogel V
2
O
5
:
n
H
2
O (
n
≈ 1.6). The low temperature CW-EPR spectrum shows hyperfine structure due to coupling of unpaired V
4+
electron with the vanadium nucleus. The analysis of the spin Hamiltonian parameters suggests that the V
4+
ions are located in tetragonally distorted octahedral sites. The transition temperature from the rigid-lattice low-temperature regime to the high temperature liquid-like regime was determined from the analysis of the temperature dependence of the hyperfine splitting and the V
4+
motional correlation time. The Electron Spin Echo Envelope Modulation (ESEEM) data shows the signals resulting from the interaction of
1
H nuclei with V
4+
ions. The modulation effect was observed only for field values in the center of the EPR absorption spectrum corresponding to the single crystals orientated perpendicular to the magnetic field direction. At least three protons are identified in the xerogel by our magnetic resonance experiments: (I) the OH groups in the equatorial plane, (ii) the bound water molecules in the axial V=O bond and (iii) the free mobile water molecules between the oxide layers. Proton NMR lineshapes and spin-lattice relaxation times were measured in the temperature range between 150 K and 323 K. Our analysis indicates that only a fraction of the xerogel protons contribute to the measured conductivity.</abstract><cop>Boston</cop><pub>Springer US</pub><doi>10.1007/s10971-007-1663-2</doi><tpages>10</tpages></addata></record> |
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| issn | 0928-0707 1573-4846 |
| language | eng |
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| source | SpringerLink Journals |
| subjects | Absorption spectra Ceramics Chemistry Chemistry and Materials Science Colloidal gels. Colloidal sols Colloidal state and disperse state Composites Continuous radiation Coupling (molecular) Crystal structure Electron paramagnetic resonance Electron spin Electrons Exact sciences and technology General and physical chemistry Glass High temperature Hyperfine structure Inorganic Chemistry Materials Science Modulation Nanotechnology Natural Materials NMR Nuclear magnetic resonance Nuclei (nuclear physics) Optical and Electronic Materials Original Paper Single crystals Spin-lattice relaxation Temperature dependence Transition temperature Vanadium pentoxide Water chemistry |
| title | Magnetic resonance study of a vanadium pentoxide gel |
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