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Neutron Diffraction Study of the Phase Transformations in Titanium Carbohydride TiC0.50Hy

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Abstract

It is shown that the ordered phase of titanium carbohydride TiC0.50H0.31 with a face-centered cubic lattice (sp. gr. Fd\(\bar {3}\)m), obtained by self-propagating high-temperature synthesis, has an ordered antiphase domain structure with a period P = 16. This period is much larger than that in TiC0.50Hy (y ≤ 0.22), with a lower hydrogen content (P ≈ 11). It is shown that TiC0.50H0.31 decomposes at temperatures T ≤ 900°C into the cubic phase of titanium carbide TiCx (x ≥ 0.70) (sp. gr. Fm\(\bar {3}\)m) and the trigonal phase of titanium carbohydride Ti2CvHz (sp. gr. P\(\bar {3}\)m1).

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ACKNOWLEDGMENTS

We are grateful to the employees of the Laboratory of Chemistry of Hydrides and Boron (which now enters the Laboratory of Energy-Consuming Materials) of the Kurnakov Institute of General and Inorganic Chemistry (Russian Academy of Sciences), especially to L.N. Padurets for the chemical analysis of the carbon and hydrogen contents in the samples.

This study was performed within the Program of Fundamental Investigations of the Uzbekistan Academy of Sciences, project no. F2-FA-F119.

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Correspondence to I. Khidirov.

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Translated by A. Sin’kov

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Khidirov, I., Rakhmanov, S.J. Neutron Diffraction Study of the Phase Transformations in Titanium Carbohydride TiC0.50Hy. Crystallogr. Rep. 63, 1147–1152 (2018). https://doi.org/10.1134/S106377451807012X

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  • DOI: https://doi.org/10.1134/S106377451807012X

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