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

Salamat, A; Hyett, G; Cabrera, RQ; McMillan, PF; Parkin, IP; (2010) High-Pressure Behavior and Polymorphism of Titanium Oxynitride Phase Ti2.85O4N. J PHYS CHEM C , 114 (18) 8546 - 8551. 10.1021/jp100769r.

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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.

Type:Article
Title:High-Pressure Behavior and Polymorphism of Titanium Oxynitride Phase Ti2.85O4N
DOI:10.1021/jp100769r
Keywords:CHEMICAL-VAPOR-DEPOSITION, VISIBLE-LIGHT, X-RAY, NITROGEN, TI3O5, RAMAN, PHOTOCATALYST, SPECTROSCOPY, DIFFRACTION, TRANSITIONS
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry

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