Titanium interstitial phase are best applicable in different industry branches because of the unique features. Investigation their structure stability under high pressure and temperature is urgent.
Structure and substructure variation are investigated for TiB2, TiC, TiN, TiH2 after high pressure action. Treatment of materials under high pressure was be carried out by device of "anvil with hollow" type. The pressure was varied in the range of 0-7GPa, the temperature 293-2273K. Crystalline structure was be investigated by X-Ray analysis.
It is determined that, there are growth of lattice microdistortions and hardness with increase of high pressure at room temperature. It was possible through plastic strain. There is anisotropy of substructure microdistortions in TiB2. Lattice constants are not variation for TiB2 and TiC. It is determined that lattice constans decreased at increase of treatment pressure for TiN and TiH2. This is probably due to less of number nitrogen and hydrogen atoms in the TiN and TiH2 or partly removal of hydrogen from the tetrahedral lattice interstitial sites. High pressure treatment at high temperatures (for TiN>= 1073K, for TiH2>=993K) was not decreased their lattice constants. Temperature action at high pressure are stabilize these interstitial phases.
The results of work are very promising for using at development of technology for obtain different products on base of the interstitial phase of titanium.

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