Journal Article

PUBDB-2020-04145

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Diffusive dynamics in an amorphous superionic conductor

Tietz, C. (Corresponding author)Extern* ; Fritz, T. M.Extern* ; Holzweber, K.Extern* ; Legenstein, M.Extern* ; Sepiol, B.Extern* ; Leitner, M. (Corresponding author)Extern*

2020
APS College Park, MD

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Please use a persistent id in citations: doi:10.1103/PhysRevResearch.2.043141  doi:10.3204/PUBDB-2020-04145

Abstract: The fast diffusion of alkali ions and resulting high ionic conductivity is a defining feature of alkali borate glasses. Here we report impedance spectroscopy and atomic-scale x-ray photon correlation spectroscopy measurements on rubidium borate systems (Rb$_2$O)$_x$(B$_2$O$_3$)$_{100−x}$ with particular focus on $x$ = 30mol %. We find that the coherently scattered intensity does not show temporal fluctuations on timescales corresponding to ionic diffusion. We conclude that the spatial configuration of alkali sites as stepping stones for ionic diffusion evolves on the same timescales as the borate backbone, and that the defect density is low, i.e., at a given instant, nearly all alkali sites are singly occupied.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)

Research Program(s):

1. 6G3 - PETRA III (POF3-622) (POF3-622)
2. FS-Proposal: I-20160660 EC (I-20160660-EC) (I-20160660-EC)
3. FS-Proposal: I-20170686 EC (I-20170686-EC) (I-20170686-EC)

Experiment(s):

1. PETRA Beamline P10 (PETRA III)

Appears in the scientific report 2020

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