Glasses in the system of MnNbOF5–BaF2–BiF3–ErF3

Ignatieva, L. N.; Surovtsev, N. V.; Савченко, Н. Н.; Adichtchev, S. V.; Polyshchuk, S. A.; Marchenko, Yu. V.; Bouznik, V. M.

doi:10.1016/j.jnoncrysol.2011.08.007

Cited by 13 publications

(4 citation statements)

References 12 publications

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“…Note that the discussed band is virtually absent in the Raman spectra of the glass samples. Such a peculiarity is much more pronounced in the glasses based on MnNbOF 5 or CuNbOF 5 , − where the intensities of the IR band at 700–800 cm –1 are comparable to or even higher than those of Nb–O stretches. The authors have assigned this band to bridging −Nb–O–Nb– vibrations.…”

Section: Results and Interpretationmentioning

confidence: 99%

“…This spectral feature has also been mentioned for oxofluoroniobates in Flinak . This feature is much more pronounced in the Cu(Mn)NbOF 5 -based glasses, − which must consist of alternating M 2+ and Nb 5+ octahedra (pyrochlore-like type structure). The addition of Ba(Pb)F 2 leads to a higher concentration of rapidly reoriented, isolated NbOF 5 octahedra.…”

Section: Results and Interpretationmentioning

confidence: 99%

“…However, this peculiarity can be used to distinguish isolated polyhedra from the bridging −M–O–M– species shown in both IR and Raman spectra. Thus, the assumption that the network of oxofluoroniobate glasses consists of chains of O-bridging niobium octahedra − is not proven.…”

Section: Discussionmentioning

confidence: 99%

“…Ignat’eva and co-workers used vibrational spectroscopy and quantum-chemical calculations to characterize the glass structure based mainly on the starting oxofluoroniobates such as CuNbOF 5 ·4H 2 O and MnNbOF 5 ·4H 2 O. Their numerous publications − evidence that the glass network is built from oxofluoroniobate polyhedra linked through oxygen bridges. However, the corresponding band is present in the IR spectrum but virtually absent in the Raman spectrum of the glasses.…”

Section: Introductionmentioning

confidence: 99%

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Bonding and Structure of Oxofluoroniobate-Based Glasses

et al. 2013

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Glasses based on the oxofluoroniobate anion have been characterized by vibrational and solid-state NMR spectroscopy. The mechanism of glass formation in the systems K2NbOF5-MF3 (M = Al, In) has been suggested. A glass network is built from the chains of corner-sharing octahedra through -Nb-F(O)-M- and -Nb-F-Nb- bridges. Isolated NbOF5(2-) octahedra are also present, which is consistent with the glass composition. The high ionic mobility of NbOF5(2-) due to its fast reorientations results in equalization of the Nb-O and Nb-F distances, which is reflected in the appearance of the IR band at 700-800 cm(-1) not observed in the Raman spectrum. Its assignment to bridging -Nb-O-Nb- species accepted in the literature was not proven.

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Section: Results and Interpretationmentioning

confidence: 99%

Section: Results and Interpretationmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bonding and Structure of Oxofluoroniobate-Based Glasses

et al. 2013

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Initiating a Room‐Temperature Rechargeable Aqueous Fluoride‐Ion Battery with Long Lifespan through a Rational Buffering Phase Design

Tang

Zhu

et al. 2021

Advanced Energy Materials

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Previously reported fluoride‐ion batteries (FIBs) can only work at high temperatures (>150 °C) with solid electrolytes or organic electrolytes. Aqueous FIB has barely been reported due to the unstable F– electrochemistry in aqueous electrolytes. In addition, the electrode materials commonly suffer from serious and adverse volume expansion during the conversion reaction. Herein, a stable aqueous F– electrochemistry is realized by a rational buffering phase design in which stagger distribution of BiF3 and Bi7F11O5 phases is achieved. The enhanced F– electrochemistry is systematically studied and suggests that the Bi7F11O5 phase plays a vital role in the stability and reversibility of the electrode due to its lower volume change and higher electronic conductivity. Pulverization and dissolution of active species issues are also suppressed. As a result, the assembled battery delivers excellent cycling stability, high reversibility, and superior rate capability, which is far better than conventional solid fluoride shuttle batteries. Mechanism studies demonstrate that the capacity comes from reversible conversion between Bi3+ and Bi0 with an intermediate phase of Bi7F11O5. This work initiates room‐temperature FIBs with aqueous electrolytes and provides a good cycling lifespan, which pave the way to a more practical fluoride ion storage system.

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