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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.
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 language | English |
---|---|
Article number | 171401 |
Pages (from-to) | 1-21 |
Number of pages | 21 |
Journal | Royal Society Open Science |
Volume | 5 |
Issue number | 1 |
DOIs | |
Publication status | Published - 17 Jan 2018 |
Keywords
- glass structure
- phase separation
- super-ionic phase
- percolation transition
- electric force microscopy
- neutron diffraction
- x-ray diffraction
Fingerprint
Dive into the research topics of 'Structure of semiconducting versus fast-ion conducting glasses in the Ag–Ge–Se system'. Together they form a unique fingerprint.Projects
- 3 Finished
-
Network Structures: from Fundamentals to Functionality
Salmon, P. (PI) & Zeidler, A. (CoI)
Engineering and Physical Sciences Research Council
5/06/12 → 4/10/15
Project: Research council
-
Glassy and Liquid Networks: Deformability and Manipulation
Salmon, P. (PI) & Zeidler, A. (Researcher)
Engineering and Physical Sciences Research Council
1/10/08 → 30/12/11
Project: Research council
-
Ag-Ge-Se Glasses and their Role in Programmable Metallization Cell Devices
Salmon, P. (PI)
Science and Technology Facilities Council
1/06/08 → 30/09/08
Project: Research council
Profiles
-
Anita Zeidler
- Department of Physics - Lecturer
- Centre for Nanoscience and Nanotechnology
- Condensed Matter Physics CDT
Person: Research & Teaching, Researcher
Datasets
-
Data sets for article entitled "Structure of semiconducting versus fast-ion conducting glasses in the Ag-Ge-Se system"
Salmon, P. (Creator) & Zeidler, A. (Creator), University of Bath, 17 Jan 2018
DOI: 10.15125/BATH-00423
Dataset