Electrical transport in mixed ion-polaron glasses

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F19%3A39914964" target="_blank" >RIV/00216275:25310/19:39914964 - isvavai.cz</a>

Result on the web

<a href="https://www.ingentaconnect.com/content/sgt/ejgst/2019/00000060/00000003/art00001" target="_blank" >https://www.ingentaconnect.com/content/sgt/ejgst/2019/00000060/00000003/art00001</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.13036/17533562.60.3.038" target="_blank" >10.13036/17533562.60.3.038</a>

Result language

angličtina

Original language name

Electrical transport in mixed ion-polaron glasses

Original language description

Mixed ionic-polaronic transport has been investigated in two series of glasses containing Na2O and WO3/MoO3, namely xWO(3) -(30-0.5x)Na2O-(30-0.5x)ZnO-40P(2)O(5) and xMoO(3)-(30-0.5x)Na2O-(30-0.5x)ZnO-40P(2)O(5), 0 &lt;= x &lt;= 60(mol%). The changes in the conduction mechanism with the systematic alternation of the glass composition have been analysed in correlation to the structural modifications and variations of molybdenum and tungsten in different oxidation states. Raman spectra revealed the clustering of WO(6 )units by the formation of W-O-W bonds in glasses with increasing WO3 content while the co-existence of MoO4 and MoO6 units is evidenced in glasses containing MoO3. In particular, the dominant molybdenum coordination in glasses with highest MoO3 content is four suggesting the absence of clustering of molybdate units. The DC conductivity of glasses with &lt;= 20 mol% of WO3 and &lt;= 30 mol% of MoO3 is almost identical due to the dominance of ionic conductivity. In this compositional region, the introduction of tungstate and molybdate units in the glass structure increases the mobility of sodium ions and compensates the decrease in sodium number density. The significant difference in conductivity is observed for glasses with higher WO3 and MoO3 content. While for glasses containing MoO3 the conductivity remains almost constant up to 50 mol% of MoO3, it constantly increases for almost six orders of magnitude for glasses with up to 60 mol% of WO3. The behaviour of DC conductivity for glasses containing MoO3 suggests the transition from ionic to polaronic conduction mechanisms which transport pathways are independent of each other. On the other hand, significantly higher conductivity of glasses with higher amounts of WO3 originates from a huge polaronic contribution, much larger than in a case of MoO3. Such a high conductivity is a consequence of the clustering of tungstate units which forms continuous W-O-W-O-W bridges which significantly facilitate polaronic transport.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10402 - Inorganic and nuclear chemistry

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physics and Chemistry of Glasses: European Journal of Glass Science and Technology Part B

ISSN

1753-3562

e-ISSN

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Volume of the periodical

60

Issue of the periodical within the volume

3

Country of publishing house

GB - UNITED KINGDOM

Number of pages

7

Pages from-to

97-103

UT code for WoS article

000478714300001

EID of the result in the Scopus database

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