Abstract
A comprehensive study of the local atomic structure of titanium compounds obtained by mechanical activation (Ti–Al–C, Ti2AlC) and reference samples (Ti, TiH2) using extended X-ray absorption fine structure (EXAFS) and extended electron energy loss fine structure (EXELFS) spectroscopy is carried out. An analysis of the local atomic structure of titanium hydride shows that the presence of hydrogen expands the crystal lattice and leads to a change in the parameters of the local atomic structure. This change is observed both in the EXAFS and EXELFS spectra. It is shown that after mechanical activation, the coordination numbers decrease, which may indicate the formation of a multiphase system. Further annealing leads to formation of the Ti2AlC compound, which is confirmed by the results of model calculations.
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ACKNOWLEDGMENTS
This work was supported by the Ministry of Science and Higher Education of the Russian Federation (Agreement no. 075-15-2022-263). The experiments were performed using large-scale research facilities “EXAFS spectroscopy beamline”. The studies were carried out using the equipment of the Center for Collective Use “Center for Physical and Physico-Chemical Methods of Analysis, Study of the Properties and Characteristics of Surfaces, Nanostructures, Materials and Products” Udmurt Federal Research Center, Ural Branch, Russian Academy of Sciences. The study was performed at the Shared Research Center SSTRC on the basis of the VEPP-4-VEPP-2000 complex at the Budker Institute of Nuclear Physicss, Siberian Branch, Russian Academy of Sciences.
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Averkiev, I.K., Bakieva, O.R. & Kriventsov, V.V. Comprehensive Study of the Local Atomic Structure of Promising Ti-Containing Compounds. J. Surf. Investig. 17, 724–729 (2023). https://doi.org/10.1134/S1027451023030229
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DOI: https://doi.org/10.1134/S1027451023030229