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By using the state-of-the-art microscopy and spectroscopy inaberration-corrected scanning transmission electron microscopes, we determinethe atomic arrangements, occupancy, elemental distribution, and the electronicstructures of dislocation cores in the 10{\deg}tilted SrTiO3 bicrystal. Weidentify that there are two different types of oxygen deficient dislocationcores, i.e., the SrO plane terminated Sr0.82Ti0.85O3-x (Ti3.67+, 0.48<x<0.91)and TiO2 plane terminated Sr0.63Ti0.90O3-y (Ti3.60+, 0.57<y<1). They have thesame Burgers vector of a[100] but different atomic arrangements and chemicalproperties. Besides the oxygen vacancies, Sr vacancies and rocksalt-liketitanium oxide reconstruction are also identified in the dislocation core withTiO2 plane termination. Our atomic-scale study reveals the true atomicstructures and chemistry of individual dislocation cores, providing usefulinsights into understanding the properties of dislocations and grainboundaries.

Atomic-Scale Structure Relaxation, Chemistry and Charge Distribution of Dislocation Cores in SrTiO3