Synthesis of U3Se5 and U3Te5 type polymorphs of Ta3N5 by combining high pressure–temperature pathways with a chemical precursor approach

DOI: 10.1039/C4CC05147E

Authors: Ashkan Salamat (Harvard University) , Katherine Woodhead (University College London) , S. Imran U. Shah (University of Southampton) , Andrew Hector (University of Southampton) , Paul Mcmillan (University of Southampton)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Chemical Communications

State: Published (Approved)
Published: July 2014
Diamond Proposal Number(s): 986

Abstract: Combining metastable precursors with high pressure–temperature treatment is a powerful tool to make nitrogen-rich metal nitrides. Two new dense polymorphs of Ta3N5 have previously been theoretically predicted, with U3Se5 (Pnma) and U3Te5 (Pnma) structure types, and are now shown to exist. Amorphous Ta3N5 from thermal ammonolysis of an amorphous polymeric precursor was laser heated at 22 GPa and examined using synchrotron X-ray diffraction to reveal the emergence of these two novel polymorphs.

Subject Areas: Chemistry


Instruments: I15-Extreme Conditions