Structure of semiconducting versus fast-ion conducting glasses in the Ag–Ge–Se system

Anita Zeidler, Philip Salmon, Dean Whittaker, Andrea Piarristeguy, Annie Pradel, Henry Fischer, Chris J Benmore, Ozgur Gulbiten

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The transition from a semiconductor to a fast-ion conductor
with increasing silver content along the Agx(Ge0.25Se0.75)(100−x)
tie line (0 ≤ x ≤ 25) was investigated on multiple length scales
by employing a combination of electric force microscopy,
X-ray diffraction, and neutron diffraction. The microscopy
results show separation into silver-rich and silver-poor phases,
where the Ag-rich phase percolates at the onset of fastion
conductivity. The method of neutron diffraction with
Ag isotope substitution was applied to the x=5 and x=25
compositions, and the results indicate an evolution in structure
of the Ag-rich phase with change of composition. The Ag–Se
nearest-neighbours are distributed about a distance of 2.64(1)
Å, and the Ag–Se coordination number increases from 2.6(3)
at x=5 to 3.3(2) at x=25. For x=25, the measured Ag–Ag
partial pair-distribution function gives 1.9(2) Ag–Ag nearestneighbours
at a distance of 3.02(2) Å. The results show breakage
of Se–Se homopolar bonds as silver is added to the Ge0.25Se0.75
base glass, and the limit of glass-formation at x28 coincides
with an elimination of these bonds. A model is proposed for
tracking the breakage of Se–Se homopolar bonds as silver is
added to the base glass.
Original languageEnglish
Article number171401
Number of pages21
JournalRoyal Society Open Science
Volume5
Issue number1
DOIs
Publication statusPublished - 17 Jan 2018

Fingerprint

silver
conduction
glass
ions
neutron diffraction
microscopy
coordination number
elimination
conductors
isotopes
distribution functions
substitutes
conductivity
diffraction
x rays

Keywords

  • glass structure
  • phase separation
  • super-ionic phase
  • percolation transition
  • electric force microscopy
  • neutron diffraction
  • x-ray diffraction

Cite this

Structure of semiconducting versus fast-ion conducting glasses in the Ag–Ge–Se system. / Zeidler, Anita; Salmon, Philip; Whittaker, Dean; Piarristeguy, Andrea; Pradel, Annie; Fischer, Henry; Benmore, Chris J; Gulbiten, Ozgur.

In: Royal Society Open Science, Vol. 5, No. 1, 171401, 17.01.2018.

Research output: Contribution to journalArticle

Zeidler, A, Salmon, P, Whittaker, D, Piarristeguy, A, Pradel, A, Fischer, H, Benmore, CJ & Gulbiten, O 2018, 'Structure of semiconducting versus fast-ion conducting glasses in the Ag–Ge–Se system', Royal Society Open Science, vol. 5, no. 1, 171401. https://doi.org/10.1098/rsos.171401
Zeidler, Anita ; Salmon, Philip ; Whittaker, Dean ; Piarristeguy, Andrea ; Pradel, Annie ; Fischer, Henry ; Benmore, Chris J ; Gulbiten, Ozgur. / Structure of semiconducting versus fast-ion conducting glasses in the Ag–Ge–Se system. In: Royal Society Open Science. 2018 ; Vol. 5, No. 1.
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abstract = "The transition from a semiconductor to a fast-ion conductorwith increasing silver content along the Agx(Ge0.25Se0.75)(100−x)tie line (0 ≤ x ≤ 25) was investigated on multiple length scalesby employing a combination of electric force microscopy,X-ray diffraction, and neutron diffraction. The microscopyresults show separation into silver-rich and silver-poor phases,where the Ag-rich phase percolates at the onset of fastionconductivity. The method of neutron diffraction withAg isotope substitution was applied to the x=5 and x=25compositions, and the results indicate an evolution in structureof the Ag-rich phase with change of composition. The Ag–Senearest-neighbours are distributed about a distance of 2.64(1){\AA}, and the Ag–Se coordination number increases from 2.6(3)at x=5 to 3.3(2) at x=25. For x=25, the measured Ag–Agpartial pair-distribution function gives 1.9(2) Ag–Ag nearestneighboursat a distance of 3.02(2) {\AA}. The results show breakageof Se–Se homopolar bonds as silver is added to the Ge0.25Se0.75base glass, and the limit of glass-formation at x28 coincideswith an elimination of these bonds. A model is proposed fortracking the breakage of Se–Se homopolar bonds as silver isadded to the base glass.",
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