Abstract
We report a crystallographic study of Ti2.85O4N, a new titanium oxynitride phase discovered using chemical vapor deposition and combinatorial chemistry techniques, under high-pressure conditions. Synchrotron X-ray diffraction was used to monitor structural changes in the material during compression up to 68 GPa. The data indicate that the orthorhombic (Cmcm) ambient-pressure phase (K-0 = 154 +/- 22 GPa with K-0' = 5.2 +/- 0.5) undergoes a first-order transition at 18 GPa to a new orthorhombic (Pmc2(1)) structure. This new high-pressure polymorph remains stable up to 42 GPa, after which the emergence of a second high-pressure monoclinic (P2(1)/c) phase is observed.
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