Exploring the Effect of V2O5 and Nb2O5 Content on the Structural, Thermal, and Electrical Characteristics of Sodium Phosphate Glasses and Glass-Ceramics
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F24%3A39921855" target="_blank" >RIV/00216275:25310/24:39921855 - isvavai.cz</a>
Result on the web
<a href="https://www.mdpi.com/1422-0067/25/5/3005" target="_blank" >https://www.mdpi.com/1422-0067/25/5/3005</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3390/ijms25053005" target="_blank" >10.3390/ijms25053005</a>
Alternative languages
Result language
angličtina
Original language name
Exploring the Effect of V2O5 and Nb2O5 Content on the Structural, Thermal, and Electrical Characteristics of Sodium Phosphate Glasses and Glass-Ceramics
Original language description
Na-V-P-Nb-based materials have gained substantial recognition as cathode materials in high-rate sodium-ion batteries due to their unique properties and compositions, comprising both alkali and transition metal ions, which allow them to exhibit a mixed ionic-polaronic conduction mechanism. In this study, the impact of introducing two transition metal oxides, V2O5 and Nb2O5, on the thermal, (micro)structural, and electrical properties of the 35Na(2)O-25V(2)O(5)-(40 - x)P2O5 - xNb(2)O(5) system is examined. The starting glass shows the highest values of DC conductivity, sigma(DC), reaching 1.45 x 10(-8) Omega(-1) cm(-1) at 303 K, along with a glass transition temperature, T-g, of 371 degrees C. The incorporation of Nb2O5 influences both sigma(DC) and T-g, resulting in non-linear trends, with the lowest values observed for the glass with x = 20 mol%. Electron paramagnetic resonance measurements and vibrational spectroscopy results suggest that the observed non-monotonic trend in sigma(DC) arises from a diminishing contribution of polaronic conductivity due to the decrease in the relative number of V4+ ions and the introduction of Nb2O5, which disrupts the predominantly mixed vanadate-phosphate network within the starting glasses, consequently impeding polaronic transport. The mechanism of electrical transport is investigated using the model-free Summerfield scaling procedure, revealing the presence of mixed ionic-polaronic conductivity in glasses where x < 10 mol%, whereas for x >= 10 mol%, the ionic conductivity mechanism becomes prominent. To assess the impact of the V2O5 content on the electrical transport mechanism, a comparative analysis of two analogue series with varying V2O5 content (10 and 25 mol%) is conducted to evaluate the extent of its polaronic contribution.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20501 - Materials engineering
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
International Journal of Molecular Sciences
ISSN
1661-6596
e-ISSN
1422-0067
Volume of the periodical
25
Issue of the periodical within the volume
5
Country of publishing house
CH - SWITZERLAND
Number of pages
22
Pages from-to
3005
UT code for WoS article
001183340100001
EID of the result in the Scopus database
2-s2.0-85187480304