Diffusive dynamics in an amorphous superionic conductor

Author(s)

Christoph Tietz, Tobias Michael Fritz, Katharina Holzweber, Michael Legenstein, Michael Leitner, Bogdan Sepiol

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 (Rb2O)x(B2O3)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.

Organisation(s)

Dynamics of Condensed Systems

External organisation(s)

Technische Universität München

Journal

Physical Review Research

Volume

2

No. of pages

10

ISSN

2643-1564

DOI

https://doi.org/10.1103/PhysRevResearch.2.043141

Publication date

10-2020

Peer reviewed

Yes

Austrian Fields of Science 2012

103015 Condensed matter, 103018 Materials physics, 103009 Solid state physics

Keywords

ASJC Scopus subject areas

Condensed Matter Physics

Portal url

https://ucrisportal.univie.ac.at/en/publications/5853c5ae-53fb-4a95-9302-c81b787e74df