期刊
ADVANCED FUNCTIONAL MATERIALS
卷 29, 期 36, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201901266
关键词
flexoelectricity; nanoindentations; second harmonic generation; strontium titanate; symmetry breaking
类别
资金
- FRQNT postdoctoral scholarship
- Tunisia-INRS scholarship
- CFI infrastructure grant
- NSERC [506289-2017, 506953-17, RGPIN-2014-05024]
Strain gradients induced by nanoindentations in bulk undoped strontium titanate (SrTiO3) are investigated. After indenting a 850 nm deep pattern on the SrTiO3 surface with a 8 GPa hardness and an 83 GPa indentation modulus by a Berkovich tip, the resulting deformation patterns are imaged by Raman spectroscopy and by second harmonic generation microscopy. Cross-shaped compressively stressed regions along the cubic SrTiO3 primary slip planes are observed. These zones relax toward the unstrained bulk material through localized strain gradients on a length scale of several microns. Second harmonic tomography reveals the reduction of the crystal's centrosymmetry in the vicinity of the crosslike features due to a strain gradient. These results indicate the appearance of flexoelectricity following the nanoindentation process due to the creation of an inhomogeneous strain.
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