Theory and Applications of Amorphous Solid for Electrochemical Cells

Souquet, J.L.; Kone, A.; Lévy, M.

doi:10.1007/978-1-4899-2263-2_16

Cited by 5 publications

(1 citation statement)

References 64 publications

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“…In view of the potential utilization of thioborate glasses as solid-state electrolytes, ,,− it is important that their short-range order (SRO) structure be well understood . One strategy used for such studies involves the systematic synthesis of structures with varying boron-to-sulfur ratio and correlating the compositional changes occurring with the evolution of infrared, Raman, or NMR spectra.…”

Section: Introductionmentioning

confidence: 99%

Structural Study ofxNa₂S + (1 −x)B₂S₃Glasses and Polycrystals by Multiple-Quantum MAS NMR of¹¹B and²³Na

et al. 1998

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Glasses and polycrystals in the series xNa 2 S + (1 -x)B 2 S 3 have been prepared and studied by magic angle spinning (MAS) NMR and by two-dimensional multiple-quantum (MQ) MAS NMR of 11 B and 23 Na. 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 11 B spectra of xNa 2 S + (1 -x)B 2 S 3 glasses and proved instrumental in finding and identifying various structural units present within these materials as the modification of the B 2 S 3 network progressed with increasing Na 2 S content. The dominant 11 B 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. 23 Na 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.

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Section: Introductionmentioning

confidence: 99%

Structural Study ofxNa₂S + (1 −x)B₂S₃Glasses and Polycrystals by Multiple-Quantum MAS NMR of¹¹B and²³Na

et al. 1998

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ChemInform Abstract: Theory and Applications of Amorphous Solids for Electrochemical Cells

Souquet¹,

Kone²,

Lévy³

1991

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Electrical properties of thex Na2O · (1–x) (0.6 V2O5 · 0.4 P2O5) glasses for 0.1 ≦x ≦ 0.5

Momot

Garbarczyk

Wasiucionek

et al. 1994

Phys. Stat. Sol. (a)

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Electrical Properties of the x Na20 (1x) (0.6 V 2 0 , 0.4 P,O,) Glasses for 0.1 5 x 5 0.5 B Y 1. MOMOT, J. E. GARBARCZYK~), M. WASIUCIONEK, and W. JAKUBOWSKI The glasses of composition x Na,O .(1 -x) (0.6 V,O, '0.4 P,O,) for 0 < x 5 0.5 are prepared and their electrical properties are investigated by means of impedance spectroscopy. In the studied range of x the total electrical conductivity has almost entirely electronic character. Electron transport occurs via electron hopping between V4+ and V5+ centers. The ionic component of conductivity is negligible. The conductivity at 200 "C ((T,~~) decreases from 2 x ( x = 0.1) to 6 x 10-S/cm (x = 0.5) and the activation energy of conductivity increases from 0.45 to 0.83 eV in the studied range of x. A possible reason of such a behavior is the reduction of V5+ centers to V4+ by clectron trapping following an increase in sodium content.Glaser des Systems x Na,O . (1x ) (0,6 V,O, .0,4 P,O,), 0 < x 5 0,5, werden hergestellt, und ihre elektrischen Eigenschaften werden mittels Impedanz-Spektroskopie untersucht. Es zeigt sich, daU im betrachteten Bereich von x die totale elektrische Leitfahigkeit fast rein elektronisch ist. Der Elektronentransport wird durch Elektronenhopping zwischen V4+-und V5 +-Zentren realisiert. Die Ionenkomponente der Leitfahigkeit ist vernachlassigbar. Im untersuchten x-Bereich sinkt die Leitfahigkeit bei einer Temperatur von 200 "C von 2 x (x = 0,l) auf 6 x 10-'S/cm (x = 0,5), und die Aktivierungsenergie der Leitfahigkeit wlchst von 0,45 auf 0,83 eV an. Eine mogliche Erkllrung dieses Verlaufs ist die Reduktion von V5+ zu V4+, was durch Elektroneneinfang und steigenden Natriumgehalt verursacht wird.

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Theory and Applications of Amorphous Solid for Electrochemical Cells

Cited by 5 publications

References 64 publications

Structural Study ofxNa₂S + (1 −x)B₂S₃Glasses and Polycrystals by Multiple-Quantum MAS NMR of¹¹B and²³Na

Structural Study ofxNa₂S + (1 −x)B₂S₃Glasses and Polycrystals by Multiple-Quantum MAS NMR of¹¹B and²³Na

ChemInform Abstract: Theory and Applications of Amorphous Solids for Electrochemical Cells

Electrical properties of thex Na2O · (1–x) (0.6 V2O5 · 0.4 P2O5) glasses for 0.1 ≦x ≦ 0.5

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Theory and Applications of Amorphous Solid for Electrochemical Cells

Cited by 5 publications

References 64 publications

Structural Study ofxNa2S + (1 −x)B2S3Glasses and Polycrystals by Multiple-Quantum MAS NMR of11B and23Na

Structural Study ofxNa2S + (1 −x)B2S3Glasses and Polycrystals by Multiple-Quantum MAS NMR of11B and23Na

ChemInform Abstract: Theory and Applications of Amorphous Solids for Electrochemical Cells

Electrical properties of thex Na2O · (1–x) (0.6 V2O5 · 0.4 P2O5) glasses for 0.1 ≦x ≦ 0.5

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Structural Study ofxNa₂S + (1 −x)B₂S₃Glasses and Polycrystals by Multiple-Quantum MAS NMR of¹¹B and²³Na

Structural Study ofxNa₂S + (1 −x)B₂S₃Glasses and Polycrystals by Multiple-Quantum MAS NMR of¹¹B and²³Na