Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 403, Issue 1-2, Pages 131-142Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2005.04.197
Keywords
high pressure and high temperature synthesis; diamond anvil cell; supercritical fluid nitrogen; 3d-transition metal nitride; octahedron
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Syntheses of 3d-transition metal (Ti-Cu) nitrides have been tried in a supercritical nitrogen fluid at high pressures (about 10 GPa) and high temperatures (about 1800 K) using diamond anvil cell and YAG laser heating system. Nitrides, such as TiN, VN, CrN, Mn3N2, Fe2N, Co2N and Ni3N have been successfully synthesized easily by a simple direct nitriding reaction between metal and fluid nitrogen in a short time, while any Cu nitrides were not synthesized. These results indicate that the ratio of nitrogen to metal, N/M, of the nitride decreases from 1 to 0 with the sequence from the early transition metal nitrides to the late transition metal ones. The systematic change of the N/M ratio and crystal structure of the 3d-transition metal nitrides is discussed and interpreted on the basis of the electron arrangement of the 3d-transition metal which is relevant to its coordination number. (c) 2005 Elsevier B.V. All rights reserved.
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