Neutron diffraction study of the ordered structures of nonstoichiometric titanium carbide

Hydrogen insertion in substoichiometric titanium carbide

“…4 (a)) and TiC 0.65 ( Fig. 4 (b)), the progressive splitting with the annealing time is clearly visible and the whole XRD patterns identified the trigonal variety (R-3m space group) of the carbide, corresponding to the ICDD-PDF cards n 01-070-9259 [14].…”

“…If so, the mass conservation imposes that a titanium phase with low carbon content must also appear. Currently, this has not been observed, but such a demixing of TiC 0.55 remains the most probable explanation, since titanium precipitations have already been reported several times in the literature during annealing treatments [8,14].…”

TiC–TiB2 composites: A review of phase relationships, processing and properties

“…A number of investigations have led to suggestions that through the redistribution of carbon atoms and structural vacancies, various ordered substoichiometric crystal structures may form in the Ti-C system. 12 Tashmetov et al 13 observed two ordered structures with trigonal and cubic symmetry with compositions TiC 0.59 and TiC 0.62 respectively. The trigonal ordered phase was formed below 770 • C, while the cubic ordered phase was observed at higher temperatures.…”

Reaction of titanium with carbon in a laser heated diamond anvil cell and reevaluation of a proposed pressure-induced structural phase transition of TiC

“…Possible ordering schemes of the defects have been discussed controversially in the literature [2][3][4][5]. Regrettably, the nomenclature has been inconsistent, as phases with different crystal structures have been given the same designation in the case of ı .…”

“…* Corresponding author. For low carbon concentrations (up to TiC 0.71 ), a cubic phase with space group symmetry Fd3m and twice the lattice parameter of the ı-phase has been reported [5] to be the stable phase at high temperatures above T ≈ 1050 K. An ordered rhombohedral structure ı -phase has been suggested to be stable at lower temperatures [6]. A trigonal structure with space group P31 or P3 1 21 has been discussed by [3] and [2], respectively.…”