An X-Ray Absorption Spectroscopy Study of Ball-Milled Lithium Tantalate and Lithium Titanate Nanocrystals

Chadwick, A. V. and Pickup, David M. and Ramos, Silvia and Cibin, G. and Tapia-Ruiz, Nuria and Breuer, S. and Wohlmuth, D. and Wilkening, M. (2017) An X-Ray Absorption Spectroscopy Study of Ball-Milled Lithium Tantalate and Lithium Titanate Nanocrystals. IOP Conference Series: Materials Science and Engineering, 169 (1). ISSN 1757-8981

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Abstract

Previous work has shown that nanocrystalline samples of lithium tantalate and titanate prepared by high-energy milling show unusually high lithium ion conductivity. Here, we report an X-ray absorption spectroscopy (XAS) study at the Ti K-edge and the Ta L3 edge of samples that have been milled for various lengths of time. For both systems the results show that milling creates amorphous material whose quantity increases with the milling time. The more extensive data for the tantalate shows that milling for only 30 minutes generates ~25% amorphous content in the sample. The content rises to ~60% after 16 hours. It is suggested that it is the motion of the lithium ions through the amorphous content that provides the mechanism for the high ionic conductivity.

Item Type:
Journal Article
Journal or Publication Title:
IOP Conference Series: Materials Science and Engineering
ID Code:
86146
Deposited By:
Deposited On:
03 May 2017 09:58
Refereed?:
Yes
Published?:
Published
Last Modified:
23 Sep 2020 03:29