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High-Pressure Behavior and Polymorphism of Titanium Oxynitride Phase Ti2. 85O4N

DOI: 10.1021/jp100769r DOI Help

Authors: Ashkan Salamat (University College London) , Geoffrey Hyett (University College London) , Raul Quesada Cabrera (University College London) , Paul F. Mcmillan (University College London) , Ivan P. Parkin (University College London)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Physical Chemistry C , VOL 114 (18) , PAGES 8546–8551

State: Published (Approved)
Published: April 2010

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 (K0 = 154 ± 22 GPa with K0′ = 5.2 ± 0.5) undergoes a first-order transition at 18 GPa to a new orthorhombic (Pmc21) structure. This new high-pressure polymorph remains stable up to 42 GPa, after which the emergence of a second high-pressure monoclinic (P21/c) phase is observed.

Subject Areas: Physics, Chemistry


Instruments: I15-Extreme Conditions