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Cho, Jaephil
Nano Energy Storage Materials Lab (NESM)
Research Interests
  • Li-ion battery, metal-air battery, redox-flow battery, flexible battery .

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Structural study of xNa(2)S+(1-x)B2S3 glasses and polycrystals by multiple-quantum MAS NMR of B-11 and Na-23

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dc.contributor.author Hwang, SJ ko
dc.contributor.author Fernandez, C ko
dc.contributor.author Amoureux, JP ko
dc.contributor.author Han, JW ko
dc.contributor.author Cho, Jaephil ko
dc.contributor.author Martin, SW ko
dc.contributor.author Pruski, M ko
dc.date.available 2014-11-21T00:13:01Z -
dc.date.created 2014-11-18 ko
dc.date.issued 1998-07 -
dc.identifier.citation JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.120, no.29, pp.7337 - 7346 ko
dc.identifier.issn 0002-7863 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/9108 -
dc.identifier.uri http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0032578161 ko
dc.description.abstract Glasses and polycrystals in the series xNa(2)S + (1 - x)B2S3 have been prepared and studied by magic angle spinning (MAS) NMR and by two-dimensional multiple-quantum (MQ) MAS NMR of B-11 and Na-23. These techniques, when applied at various magnetic fields and combined with computer simulations of the spectra, provide new insights into the structure of the polycrystalline samples. Isotropic chemical shifts, quadrupolar parameters, and relative concentrations of the various boron sites are obtained by NMR and correlated with the known structures of boron trisulfide (x = 0), sodium metathioborate (x = 0.5) and sodium orthothioborate (x = 0.75). A structural model of polycrystalline sodium dithioborate (x = 0.33) is proposed. The MQMAS NMR method significantly enhanced the resolution in B-11 spectra of xNa(2)S + (1 - x)B2S3 glasses and proved instrumental in finding and identifying various structural units present within these materials as the modification of the B2S3 network progressed with increasing Na2S content. The dominant B-11 resonances observed in the glassy samples represent the same basic structural units that were observed in the polycrystalline compounds. In addition, several new resonances featuring trigonally and tetrahedrally coordinated boron atoms in various transitional structures between dithioborate and metathioborate, or between metathioborate and orthothioborate, were found. Na-23 NMR proved less informative, especially in the glassy samples where the motion of the sodium ions between various sites precluded the observation of well-resolved spectra. ko
dc.description.statementofresponsibility close -
dc.language ENG ko
dc.publisher AMER CHEMICAL SOC ko
dc.subject NUCLEAR-MAGNETIC-RESONANCE ko
dc.subject SHORT-RANGE ORDER ko
dc.subject SOLID-STATE NMR ko
dc.subject INFRARED-SPECTROSCOPY ko
dc.subject THIOBORATE GLASSES ko
dc.subject QUADRUPOLAR NUCLEI ko
dc.subject SILICATE-GLASSES ko
dc.subject RESOLUTION ko
dc.subject SPECTRA ko
dc.subject AL-27 ko
dc.title Structural study of xNa(2)S+(1-x)B2S3 glasses and polycrystals by multiple-quantum MAS NMR of B-11 and Na-23 ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-0032578161 ko
dc.identifier.wosid 000075176000022 ko
dc.type.rims ART ko
dc.description.wostc 36 *
dc.description.scopustc 34 *
dc.date.tcdate 2015-05-06 *
dc.date.scptcdate 2014-11-18 *
dc.identifier.doi 10.1021/ja9800481 ko
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