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Issue 9, 2024
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Accepted articles
Reviews of topical problems


Thermodynamic properties of zirconium nitride in the condensed state

 a,  a,  b, a
a Joint Institute for High Temperatures, Russian Academy of Sciences, ul. Izhorskaya 13/19, Moscow, 127412, Russian Federation
b Lebedev Physical Institute, Russian Academy of Sciences, Leninsky prosp. 53, Moscow, 119991, Russian Federation

The analytical review presents the thermodynamic properties of zirconium nitride: the phase diagram of the Zr-N system, the homogeneity region, temperature and composition corresponding to congruent melting of ZrNx, the enthalpy of formation, as well as the electronic structure and chemical bond in zirconium nitride. An equation is given of approximating the temperature dependence for the specific heat crystalline ZrN in the temperature range 298.15-3970 K. The temperature dependences of the specific heat and electrical resistance of liquid zirconium nitride of the composition 0.9ZrN+0.1 ZrO2 (up to 4500 K), measured by heating with a microseconds current pulse, are presented. The main practical significance of these results lies in the fact that ZrN serves as an inert matrix of mixed nitride fuels (U,Zr)N and (Pu,Zr)N for fast neutron reactors.

Keywords: nuclear fuel matrices, zirconium nitride, phase diagram, solid phase, melting, liquid state, enthalpy of formation, enthalpy, specific heat, electrical resistance, temperature measurement, pulse current heating method
DOI: 10.3367/UFNe.2024.02.039654
Citation: Aristova N M, Onufriev S V, Savvatimskiy A I "Thermodynamic properties of zirconium nitride in the condensed state" Phys. Usp., accepted

Received: 4th, October 2023, revised: 28th, January 2024, 27th, February 2024

Оригинал: Аристова Н М, Онуфриев С В, Савватимский А И «Термодинамические свойства нитрида циркония в конденсированном состоянии» УФН, принята к публикации; DOI: 10.3367/UFNr.2024.02.039654

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