Percolation behavior of Ag in Ge16Sb12Se72 glassy matrix and its impact on corresponding ionic conductivity
Result description
In the present article, the silver diffusion behavior and its influence on ionic conduction have been studied from a series of glass samples Agx(Ge16Sb12Se72)100-x with 0 ≤ x ≤ 25. A non-linear evolution of the ionic conduction as a function of Ag concentration was found and attributed to a variation in the diffusion mechanism following the Ag rate. The glasses with Ag concentration lower than 5 at. % i.e. for Ag0.2 to Ag1, the Ag+ diffusion mainly occurs via a percolation mechanism, whereas for the Ag concentration from Ag5 up to Ag15, a hopping mechanism is prevailing. However, for Ag5 the diffusion occurs with mixed mechanism i.e. percolation + hopping way. For the Ag content higher than 15 at. % the diffusion occurs via a correlated walk and it was found that the repulsive nature between the Ag+ ions in the high concentrated sample due to much shorter distance does not show self-blocking nature. Additionally, the samples show a transition from electronic to ionic conductivity. From Raman analysis a correlation between the content of Ag and the type of GeSe4/2 tetrahedron, corner or edge-shared, which takes place in the structure, was evidenced. Finally, the results allow a better understanding of the mechanism of the Ag conduction in the glasses of the Ge-Sb-Se system using the random-walk (RW) model.
Keywords
The result's identifiers
Result code in IS VaVaI
Alternative codes found
RIV/00216275:25310/19:39915477
Result on the web
DOI - Digital Object Identifier
Alternative languages
Result language
angličtina
Original language name
Percolation behavior of Ag in Ge16Sb12Se72 glassy matrix and its impact on corresponding ionic conductivity
Original language description
In the present article, the silver diffusion behavior and its influence on ionic conduction have been studied from a series of glass samples Agx(Ge16Sb12Se72)100-x with 0 ≤ x ≤ 25. A non-linear evolution of the ionic conduction as a function of Ag concentration was found and attributed to a variation in the diffusion mechanism following the Ag rate. The glasses with Ag concentration lower than 5 at. % i.e. for Ag0.2 to Ag1, the Ag+ diffusion mainly occurs via a percolation mechanism, whereas for the Ag concentration from Ag5 up to Ag15, a hopping mechanism is prevailing. However, for Ag5 the diffusion occurs with mixed mechanism i.e. percolation + hopping way. For the Ag content higher than 15 at. % the diffusion occurs via a correlated walk and it was found that the repulsive nature between the Ag+ ions in the high concentrated sample due to much shorter distance does not show self-blocking nature. Additionally, the samples show a transition from electronic to ionic conductivity. From Raman analysis a correlation between the content of Ag and the type of GeSe4/2 tetrahedron, corner or edge-shared, which takes place in the structure, was evidenced. Finally, the results allow a better understanding of the mechanism of the Ag conduction in the glasses of the Ge-Sb-Se system using the random-walk (RW) model.
Czech name
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Czech description
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Classification
Type
Jimp - 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
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Alloys and Compounds
ISSN
0925-8388
e-ISSN
—
Volume of the periodical
782
Issue of the periodical within the volume
25 April
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
9
Pages from-to
375-383
UT code for WoS article
000458608600042
EID of the result in the Scopus database
2-s2.0-85058695961
Basic information
Result type
Jimp - Article in a specialist periodical, which is included in the Web of Science database
OECD FORD
Inorganic and nuclear chemistry
Year of implementation
2019