Diffusive dynamics in an amorphous superionic conductor

Autor(en)

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

Abstrakt

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(en)

Dynamik Kondensierter Systeme

Externe Organisation(en)

Technische Universität München

Journal

Physical Review Research

Band

2

Anzahl der Seiten

10

ISSN

2643-1564

DOI

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

Publikationsdatum

10-2020

Peer-reviewed

Ja

ÖFOS 2012

103015 Kondensierte Materie, 103018 Materialphysik, 103009 Festkörperphysik

Schlagwörter

ASJC Scopus Sachgebiete

Condensed Matter Physics

Link zum Portal

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