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Fracture toughness of single grains and polycrystalline Li7La3Zr2O12 electrolyte material based on a pillar splitting method

•The mechanical properties of LLZO with two different grain sizes were investigated.•Large grain sample has higher E and H compared to small grain sample.•Pillar splitting method was adopted to determine the fracture toughness.•KIC obtained via pillar splitting agrees well with that via Vickers inde...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2020-07, Vol.40 (8), p.3057-3064
Main Authors: Nonemacher, Juliane Franciele, Arinicheva, Yulia, Yan, Gang, Finsterbusch, Martin, Krüger, Manja, Malzbender, Jürgen
Format: Article
Language:English
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Summary:•The mechanical properties of LLZO with two different grain sizes were investigated.•Large grain sample has higher E and H compared to small grain sample.•Pillar splitting method was adopted to determine the fracture toughness.•KIC obtained via pillar splitting agrees well with that via Vickers indentation.•Grain boundaries show positive effect on KIC whereas negative on conductivity. In the present study an advanced pillar splitting method is used to determine the fracture toughness of a garnet-type Li7La3Zr2O12 (LLZO) electrolyte. The obtained results are compared to data derived on the basis of conventional Vickers indentation. Furthermore, potential micro-pillar size effects are investigated. The estimated fracture toughness values for single grains and polycrystalline LLZO material obtained via both methods are in good agreement, yielding ∼ 1 MPa m0.5, hence the data indicate that LLZO exhibits relatively low fracture toughness and has a brittle behavior.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2020.03.028