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

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 Ti2Cv′Hz′ (sp. gr. P $$\bar {3}$$ m1).

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