A Comprehensive Study of the Local Atomic Structure of Promising Ti-Containing Compounds

I. K. Averkiev; Аверкиев И. К.; O. R. Bakieva; Бакиева О. Р.; V. V. Kriventsov; Кривенцов В. В.

doi:10.31857/S1028096023060055

A Comprehensive Study of the Local Atomic Structure of Promising Ti-Containing Compounds

Authors: Averkiev I.K.¹, Bakieva O.R.¹, Kriventsov V.V.²
Affiliations:
1. Udmurt Federal Research Center Ural Branch of the RAS
2. Boreskov Institute of Catalysis Siberian Branch of the RAS
Issue: No 6 (2023)
Pages: 107-112
Section: Articles
URL: https://freezetech.ru/1028-0960/article/view/664558
DOI: https://doi.org/10.31857/S1028096023060055
EDN: https://elibrary.ru/DHWSDK
ID: 664558

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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 EXAFS and EXELFS spectroscopy has been 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 the formation of the Ti₂AlC compound, which is confirmed by the results of model calculations.

Keywords

MAX phase, heat treatment, EXELFS spectroscopy, EXAFS spectroscopy, chemical bond length, local atomic structure.

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