Equation of state of cubic hafnium(IV) nitride having Th3P4 -type structure |
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Authors: | Dmytro A. Dzivenko Andreas Zerr Reinhard Boehler |
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Affiliation: | a Fachbereich Material- und Geowissenschaften, Technische Universität Darmstadt, D-64287 Darmstadt, Germany b LPMTM-CNRS, Université Paris Nord, F-93430 Villetaneuse, France c Max-Planck-Institut für Chemie, Saarstraße 23, D-55122, Mainz, Germany |
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Abstract: | Pressure dependence of the specific volume, V(P), of the recently discovered high-pressure compound Hf3N4 having cubic Th3P4-type structure (c- Hf3N4) has been measured at room temperature up to 43.9 GPa in a diamond anvil cell using energy-dispersive X-ray powder diffraction combined with synchrotron radiation. A least-square fit of the Birch-Murnaghan equation of state to the experimental V(P)-data yielded for c- Hf3N4 the bulk modulus of and its first pressure derivative of . For fixed at 4 the bulk modulus of c- Hf3N4 was determined to be . The obtained B0-value is only insignificantly below that estimated in preliminary measurements. Existing theoretical predictions for B0 scatter around the present experimental data. The observation of a high bulk modulus of c- Hf3N4 supports the suggestion that this compound could have high hardness. |
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Keywords: | 61.10.Eq 62.20.Dc 62.50.+p 64 64.30.+t |
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