Compressibility of cubic vanadium mononitride
FB Material- und Geowissenschaften, Technische Universität Darmstadt - Petersenstr. 23, 64287 Darmstadt, Germany, EU
2 LPMTM-CNRS, Institut Galilée, Université Paris Nord - 99 av. J. B. Clément, 93430 Villetaneuse, France, EU
3 ESRF - BP 220, 38043 Grenoble Cedex, France, EU
Accepted: 13 December 2010
The equation of state of vanadium mononitride with a cubic rock-salt structure, δ-VN, was measured on quasi-hydrostatic compression in a diamond anvil cell to 29 GPa. From these data the bulk modulus of δ-VN, B0=300(6) GPa, and its first pressure derivative, B′0=3.6(6), were obtained. A comparison of the available data on B0 for δ-TiN, δ-ZrN, δ-HfN and δ-VN, extended by the present result, indicates a systematic agreement between the experimental B0-values from compression measurements and theoretical predictions based on the generalized gradient approximation (GGA) method. An increase of B0 with decreasing zero-pressure specific volume, earlier suggested for the group-4 and -5 transition metal mononitrides, is not confirmed.
PACS: 64.30.-t – Equations of state of specific substances / 62.20.de – Elastic moduli / 62.50.-p – High-pressure effects in solids and liquids
© EPLA, 2010