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Ionic transport and atomic structure of AgI-HgS-GeS2 glasses

Journal Article · · Pure and Applied Chemistry
 [1];  [1];  [1];  [1];  [2];  [1]
  1. Univ. du Littoral Cote d'Opale, Dunkerque (France)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
+ Show Author Affiliations
Quasi-ternary (AgI)x(HgS)0.5–x/2(GeS2)0.5–x/2 glasses, 10–4≤x≤0.6 were studied over a wide composition range covering nearly 4 orders of magnitude in the mobile cation content. The glasses show a remarkable increase of the ionic conductivity by 12 orders of magnitude and exhibit two drastically different ion transport regimes: (i) a power-law critical percolation at x≲0.04, and (ii) a modifier-controlled conductivity, exponentially dependent on x≳0.1. Using Raman spectroscopy and high-energy X-ray diffraction supported by DFT modelling of the Raman spectra we show that the glass network is essentially formed by corner-sharing CS-GeS4/2 tetrahedra. Mercury sulfide in glasses is dimorphic. The majority of Hg species (70% at x<0.2) exist as two-fold coordinated (HgS2/2)n chains. Silver species have mixed (2I+2S) tetrahedral environment forming either edge–sharing ES-Ag2I2S4/2 dimers or corner-sharing (CS-AgI2/2S2/2)n chains. Here, the relationship between the ionic transport and atomic structure of the glasses is discussed.
Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
Agence Nationale de la recherche (ANR); European Regional Development Fund (ERDF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1579950
Journal Information:
Pure and Applied Chemistry, Journal Name: Pure and Applied Chemistry Journal Issue: 11 Vol. 91; ISSN 0033-4545
Publisher:
IUPACCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
DFT modelling
Raman spectroscopy
critical percolation
high-energy X-ray diffraction
ion transport regimes
mercury sulphide dimorphism
mixed tetrahedral silver environment
silver iodide chalcogenide glasses