Physico-Chemical Properties of NaV<sub>3</sub>O<sub>8</sub> Prepared by Solid-State Reaction
Sodium–vanadium oxide NaV<sub>3</sub>O<sub>8</sub> is synthesized via solid-state method and optimum synthesis conditions are chosen based on the data of DSC and TG analysis. The material synthesized is characterized by X-ray phase analysis, Raman spectroscopy and scanning el...
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| Autores principales: | , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/06cee1e00fea469a8a58c7e367175649 |
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| Sumario: | Sodium–vanadium oxide NaV<sub>3</sub>O<sub>8</sub> is synthesized via solid-state method and optimum synthesis conditions are chosen based on the data of DSC and TG analysis. The material synthesized is characterized by X-ray phase analysis, Raman spectroscopy and scanning electron microscopy. The ratio V<sup>4+</sup>/V<sup>5+</sup> in the sample obtained is determined by X-ray photoelectron spectroscopy. Conductivity of the material synthesized was measured by impedance spectroscopy, pulse potentiometry and DC method over the range RT–570 °C. It is shown that NaV<sub>3</sub>O<sub>8</sub> has rather high conductivity essentially electron in type (6.3 × 10<sup>−2</sup> at room temperature). AC and DC conductivity measurements are performed and cycling of symmetricNaV<sub>3</sub>O<sub>8</sub>|Na<sub>3.85</sub>Zr<sub>1.85</sub>Nb<sub>0.15</sub>Si<sub>3</sub>O<sub>12</sub>|NaV<sub>3</sub>O<sub>8</sub> cell in galvanostatic conditions. Thermal stability is studied across 25–570 °C temperature range. The results obtained are compared with the properties of NaV<sub>3</sub>O<sub>8</sub> produced via aqueous solution. |
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