Optical absorption of electronic defects and chemical diffusion in vapor transport equilibrated lithium niobate at high temperatures
Optical absorption of electronic defects induced by chemical reduction, and chemical diffusion in a vapor transport equilibrated lithium niobate single crystal with 49.5mol% Li2O were studied using UV–vis-NIR optical spectroscopy under in situ conditions. In reducing atmospheres at 1000°C, optical a...
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| Veröffentlicht in: | Solid state ionics 2014-09, Vol.262, p.904-907 |
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| creator | Shi, Jianmin Fritze, Holger Weidenfelder, Anke Swanson, Claudia Fielitz, Peter Borchardt, Günter Becker, Klaus-Dieter |
| description | Optical absorption of electronic defects induced by chemical reduction, and chemical diffusion in a vapor transport equilibrated lithium niobate single crystal with 49.5mol% Li2O were studied using UV–vis-NIR optical spectroscopy under in situ conditions. In reducing atmospheres at 1000°C, optical absorption spectra are dominated by a band at about 0.93eV which is attributed to absorption of free electron-polarons, i.e., to electrons localized on niobium ions on regular lattice sites. The electron-polaron band intensity was found to follow a power law of the form (pO2)m with m ≈ −0.21. Chemical reduction reactions forming free electron-polarons were found to explain the observed defect absorption and its dependence on oxygen partial pressure at high temperatures. The chemical diffusion coefficient in the vapor transport equilibrated lithium niobate has been determined to be 2.75×10−11m2/s at 1000°C from the kinetics of reduction and oxidation processes in the range of −10 |
| doi_str_mv | 10.1016/j.ssi.2013.11.025 |
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•Optical absorption of vapor transport treated lithium niobate was measured at 1000°C in the range of logpO2/atm from −0.77 to −16.7•The absorption spectra under reducing conditions are dominated by a band at about 0.93eV due to free small electron-polarons and the absorption intensity of electronic defects shows a power law dependence on oxygen partial pressure with an exponent of −0.21•Chemical reduction reactions with and without the loss of Li2O to form free electron-polarons can explain the observed pO2-depencence•Chemical diffusion coefficient was determined using pO2-jump relaxation experiments as 2.75×10−11m2/s at 1000°C.</description><identifier>ISSN: 0167-2738</identifier><identifier>EISSN: 1872-7689</identifier><identifier>DOI: 10.1016/j.ssi.2013.11.025</identifier><language>eng</language><publisher>Elsevier B.V</publisher><subject>Asymptotic properties ; Balancing ; Chemical diffusion ; Crystal defects ; Electron-polarons ; Electronic defects ; Electronics ; Lithium niobate ; Lithium niobates ; Optical absorption ; Reduction (chemical) ; Transport</subject><ispartof>Solid state ionics, 2014-09, Vol.262, p.904-907</ispartof><rights>2013 Elsevier B.V.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c433t-dbb9067881b4930aedbd7e35b20f252a9dd725381e5cc59d81629cffc8f3fd233</citedby><cites>FETCH-LOGICAL-c433t-dbb9067881b4930aedbd7e35b20f252a9dd725381e5cc59d81629cffc8f3fd233</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0167273813006048$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65534</link.rule.ids></links><search><creatorcontrib>Shi, Jianmin</creatorcontrib><creatorcontrib>Fritze, Holger</creatorcontrib><creatorcontrib>Weidenfelder, Anke</creatorcontrib><creatorcontrib>Swanson, Claudia</creatorcontrib><creatorcontrib>Fielitz, Peter</creatorcontrib><creatorcontrib>Borchardt, Günter</creatorcontrib><creatorcontrib>Becker, Klaus-Dieter</creatorcontrib><title>Optical absorption of electronic defects and chemical diffusion in vapor transport equilibrated lithium niobate at high temperatures</title><title>Solid state ionics</title><description>Optical absorption of electronic defects induced by chemical reduction, and chemical diffusion in a vapor transport equilibrated lithium niobate single crystal with 49.5mol% Li2O were studied using UV–vis-NIR optical spectroscopy under in situ conditions. In reducing atmospheres at 1000°C, optical absorption spectra are dominated by a band at about 0.93eV which is attributed to absorption of free electron-polarons, i.e., to electrons localized on niobium ions on regular lattice sites. The electron-polaron band intensity was found to follow a power law of the form (pO2)m with m ≈ −0.21. Chemical reduction reactions forming free electron-polarons were found to explain the observed defect absorption and its dependence on oxygen partial pressure at high temperatures. The chemical diffusion coefficient in the vapor transport equilibrated lithium niobate has been determined to be 2.75×10−11m2/s at 1000°C from the kinetics of reduction and oxidation processes in the range of −10 <logpO2/atm < −14.
•Optical absorption of vapor transport treated lithium niobate was measured at 1000°C in the range of logpO2/atm from −0.77 to −16.7•The absorption spectra under reducing conditions are dominated by a band at about 0.93eV due to free small electron-polarons and the absorption intensity of electronic defects shows a power law dependence on oxygen partial pressure with an exponent of −0.21•Chemical reduction reactions with and without the loss of Li2O to form free electron-polarons can explain the observed pO2-depencence•Chemical diffusion coefficient was determined using pO2-jump relaxation experiments as 2.75×10−11m2/s at 1000°C.</description><subject>Asymptotic properties</subject><subject>Balancing</subject><subject>Chemical diffusion</subject><subject>Crystal defects</subject><subject>Electron-polarons</subject><subject>Electronic defects</subject><subject>Electronics</subject><subject>Lithium niobate</subject><subject>Lithium niobates</subject><subject>Optical absorption</subject><subject>Reduction (chemical)</subject><subject>Transport</subject><issn>0167-2738</issn><issn>1872-7689</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><recordid>eNqNkU9r3DAQxUVJoZu0H6A3HXuxqz-xJdNTCE1aCOSSnoUsjbqz2JYjyYHe88GjzeZccprH8HsD8x4hXzlrOeP990ObM7aCcdly3jLRfSA7rpVoVK-HM7KrjGqEkvoTOc_5wBjrpe535Pl-LejsRO2YY6o6LjQGChO4kuKCjnoIVWdqF0_dHuZX2mMIWz7CuNAnu8ZES7JLrqJQeNxwwjHZAp5OWPa4zXTBONYFtYXu8e-eFphXqMiWIH8mH4OdMnx5mxfkz83Ph-tfzd397e_rq7vGXUpZGj-OA-uV1ny8HCSz4EevQHajYEF0wg7eK9FJzaFzrhu85r0YXAhOBxm8kPKCfDvdXVN83CAXM2N2ME12gbhlUzPSjDPVi3egokbYK84qyk-oSzHnBMGsCWeb_hnOzLEcczC1HHMsx3BuajnV8-PkgfruE0Iy2SEsDjymmrbxEf_jfgFC85rh</recordid><startdate>20140901</startdate><enddate>20140901</enddate><creator>Shi, Jianmin</creator><creator>Fritze, Holger</creator><creator>Weidenfelder, Anke</creator><creator>Swanson, Claudia</creator><creator>Fielitz, Peter</creator><creator>Borchardt, Günter</creator><creator>Becker, Klaus-Dieter</creator><general>Elsevier B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7U5</scope><scope>8FD</scope><scope>L7M</scope></search><sort><creationdate>20140901</creationdate><title>Optical absorption of electronic defects and chemical diffusion in vapor transport equilibrated lithium niobate at high temperatures</title><author>Shi, Jianmin ; Fritze, Holger ; Weidenfelder, Anke ; Swanson, Claudia ; Fielitz, Peter ; Borchardt, Günter ; Becker, Klaus-Dieter</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c433t-dbb9067881b4930aedbd7e35b20f252a9dd725381e5cc59d81629cffc8f3fd233</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>Asymptotic properties</topic><topic>Balancing</topic><topic>Chemical diffusion</topic><topic>Crystal defects</topic><topic>Electron-polarons</topic><topic>Electronic defects</topic><topic>Electronics</topic><topic>Lithium niobate</topic><topic>Lithium niobates</topic><topic>Optical absorption</topic><topic>Reduction (chemical)</topic><topic>Transport</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Shi, Jianmin</creatorcontrib><creatorcontrib>Fritze, Holger</creatorcontrib><creatorcontrib>Weidenfelder, Anke</creatorcontrib><creatorcontrib>Swanson, Claudia</creatorcontrib><creatorcontrib>Fielitz, Peter</creatorcontrib><creatorcontrib>Borchardt, Günter</creatorcontrib><creatorcontrib>Becker, Klaus-Dieter</creatorcontrib><collection>CrossRef</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Solid state ionics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Shi, Jianmin</au><au>Fritze, Holger</au><au>Weidenfelder, Anke</au><au>Swanson, Claudia</au><au>Fielitz, Peter</au><au>Borchardt, Günter</au><au>Becker, Klaus-Dieter</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Optical absorption of electronic defects and chemical diffusion in vapor transport equilibrated lithium niobate at high temperatures</atitle><jtitle>Solid state ionics</jtitle><date>2014-09-01</date><risdate>2014</risdate><volume>262</volume><spage>904</spage><epage>907</epage><pages>904-907</pages><issn>0167-2738</issn><eissn>1872-7689</eissn><abstract>Optical absorption of electronic defects induced by chemical reduction, and chemical diffusion in a vapor transport equilibrated lithium niobate single crystal with 49.5mol% Li2O were studied using UV–vis-NIR optical spectroscopy under in situ conditions. In reducing atmospheres at 1000°C, optical absorption spectra are dominated by a band at about 0.93eV which is attributed to absorption of free electron-polarons, i.e., to electrons localized on niobium ions on regular lattice sites. The electron-polaron band intensity was found to follow a power law of the form (pO2)m with m ≈ −0.21. Chemical reduction reactions forming free electron-polarons were found to explain the observed defect absorption and its dependence on oxygen partial pressure at high temperatures. The chemical diffusion coefficient in the vapor transport equilibrated lithium niobate has been determined to be 2.75×10−11m2/s at 1000°C from the kinetics of reduction and oxidation processes in the range of −10 <logpO2/atm < −14.
•Optical absorption of vapor transport treated lithium niobate was measured at 1000°C in the range of logpO2/atm from −0.77 to −16.7•The absorption spectra under reducing conditions are dominated by a band at about 0.93eV due to free small electron-polarons and the absorption intensity of electronic defects shows a power law dependence on oxygen partial pressure with an exponent of −0.21•Chemical reduction reactions with and without the loss of Li2O to form free electron-polarons can explain the observed pO2-depencence•Chemical diffusion coefficient was determined using pO2-jump relaxation experiments as 2.75×10−11m2/s at 1000°C.</abstract><pub>Elsevier B.V</pub><doi>10.1016/j.ssi.2013.11.025</doi><tpages>4</tpages></addata></record> |
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| subjects | Asymptotic properties Balancing Chemical diffusion Crystal defects Electron-polarons Electronic defects Electronics Lithium niobate Lithium niobates Optical absorption Reduction (chemical) Transport |
| title | Optical absorption of electronic defects and chemical diffusion in vapor transport equilibrated lithium niobate at high temperatures |
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