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 m^0.5, hence the data indicate that LLZO exhibits relatively low fracture toughness and has a brittle behavior.

中文翻译：

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基于柱分裂法的单晶和多晶Li ₇ La ₃ Zr ₂ O ₁₂电解质材料的断裂韧性

在本研究中，一种先进的支柱分裂方法用于确定石榴石型Li ₇ La ₃ Zr ₂ O ₁₂（LLZO）电解质的断裂韧性。将获得的结果与基于常规维氏压痕得出的数据进行比较。此外，研究了潜在的微柱尺寸效应。通过这两种方法获得的单晶和多晶LLZO材料的估计断裂韧性值吻合良好，屈服强度约为1 MPa m ^0.5，因此数据表明LLZO表现出相对较低的断裂韧性并且具有脆性。