Abstract
The topotactic connection style of oxygen octahedron/tetrahedron in transition metal oxides (TMOs) is an important feature that modulates their corresponding physical properties. Using a simple chemical do** technique, we obtained Sr1−xNdxCoO3-δ with a crystal structure transition from face-shared octahedron to corner-shared octahedron/tetrahedron. The Rietveld analyses of the X-ray diffraction (XRD) patterns show that the crystal structure changes from rhombohedral to cubic and the connection style transforms from face-shared to corner-shared with the increase neodymium (Nd) content. During this process, the ferromagnetic behavior is greatly improved due to the larger amount of the corner-shared cubic SrCoO3-δ phase. The synchrotron radiation X-ray absorption spectroscopies of the Co L-edge and O K-edge show that Nd-do** mainly affects the electronic structure of oxygen rather than the valence state of Co. Thereby, the Nd changes the connection style of oxygen octahedron/tetrahedron, which then alters the magnetic interactions.
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Acknowledgements
This work was supported by the National Science Foundation of China (Grant No. 11704009, 11504358, 51627901), the National Key R&D Program of China (2019YFA0405603), the Open Programs for the Key Science & Technology Infrastructures of CAS, and the Anhui Initiative in Quantum Information Technologies (AHY100000). The authors thank beamline BL12-a of NSRL for providing the XAS beam times.
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Huang, H., Chen, Z., ** concentration induced face‐shared to corner‐shared transition in Strontium Cobaltite. J Mater Sci: Mater Electron 32, 9294–9301 (2021). https://doi.org/10.1007/s10854-021-05593-3
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DOI: https://doi.org/10.1007/s10854-021-05593-3