Impact of dislocation densities on the microscale strength of single-crystal strontium titanate
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866909571193241600 |
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| author | Zhang, Jiawen Fang, Xufei Lu, Wenjun |
| author_facet | Zhang, Jiawen Fang, Xufei Lu, Wenjun |
| contents | Dislocations in ceramics at room temperature are attracting increasing research interest. Dislocations may bring a new perspective for tuning physical and mechanical properties in advanced ceramics. Here, we investigate the dislocation density dependent micromechanical properties of single-crystal SrTiO3 by tuning the dislocation densities (from ~10 to the power of 10 per square meter up to ~10 to the power of 14 per square meter). Using micropillar compression tests, we find the samples exhibit a transition from brittle fracture (if no dislocation is present in the pillars) to plastic yield (with pre-engineered dislocations in the pillars). While within the regime of plastic deformation, the yield strength and plastic flow behavior exhibit a strong dependence on the dislocation density. The yield strength first decreases and then increases with the increase of dislocation densities. Detailed examination via post-mortem transmission electron microscopy reveals a complex evolution of dislocation structure, highlighting the critical role played by dislocations in regulating the brittle/ductile behavior in SrTiO3 at room temperature. Our findings shed new light on dislocation-mediated mechanical properties in ceramics and may provide designing guidelines for the prospective dislocation-based devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_04112 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Impact of dislocation densities on the microscale strength of single-crystal strontium titanate Zhang, Jiawen Fang, Xufei Lu, Wenjun Materials Science Dislocations in ceramics at room temperature are attracting increasing research interest. Dislocations may bring a new perspective for tuning physical and mechanical properties in advanced ceramics. Here, we investigate the dislocation density dependent micromechanical properties of single-crystal SrTiO3 by tuning the dislocation densities (from ~10 to the power of 10 per square meter up to ~10 to the power of 14 per square meter). Using micropillar compression tests, we find the samples exhibit a transition from brittle fracture (if no dislocation is present in the pillars) to plastic yield (with pre-engineered dislocations in the pillars). While within the regime of plastic deformation, the yield strength and plastic flow behavior exhibit a strong dependence on the dislocation density. The yield strength first decreases and then increases with the increase of dislocation densities. Detailed examination via post-mortem transmission electron microscopy reveals a complex evolution of dislocation structure, highlighting the critical role played by dislocations in regulating the brittle/ductile behavior in SrTiO3 at room temperature. Our findings shed new light on dislocation-mediated mechanical properties in ceramics and may provide designing guidelines for the prospective dislocation-based devices. |
| title | Impact of dislocation densities on the microscale strength of single-crystal strontium titanate |
| topic | Materials Science |
| url | https://arxiv.org/abs/2504.04112 |