Calculation of the Thermodynamic Quantities for Cubic Gauche Nitrogen (cg-N)

Authors : Hamit YURTSEVEN, Özge AKAY

Pages : 32-39

Doi:10.5541/ijot.1085553

View : 6 | Download : 5

Publication Date : 2022-09-01

Article Type : Research Paper

Abstract :This work aims to investigate the thermodynamic properties of the cubic gauge nitrogen insert ignore into journalissuearticles values(cg-N); by calculating the relevant thermodynamic quantities as a functions of temperature and pressure. The thermodynamic quantities of volume insert ignore into journalissuearticles values(V);, thermal expansion insert ignore into journalissuearticles values(αp);, isothermal compressibility insert ignore into journalissuearticles values(κT);, bulk modulusinsert ignore into journalissuearticles values(B);, and the heat capacity insert ignore into journalissuearticles values(Cp); are calculated as a function of temperature at constants pressures insert ignore into journalissuearticles values(0, 35, 125, 250 GPa); for the cg-N structure. Also, the pressure dependences of V, κT, αp, Cp and γ insert ignore into journalissuearticles values(macroscopic Grüneisen parameter); are predicted at T= 295 K for this structure. This calculation is caried out by the thermodynamic relations using some literature data. From our calculations, we find that the κT, αp and also B exhibit anomalous behavior as the temperature lowers below about 100 K at constant pressures studied. This is an indication that cg-N transforms to a solid phase at low temperatures insert ignore into journalissuearticles values(below about 100 K);. Experimental measurements can examine this prediction when available in the literature for the cg-N phase. Also, our predictions of the κT, αp, Cp and γ at various pressures insert ignore into journalissuearticles values(T= 295 K); can be examined experimentally for the cg-N phase. This calculation method can be applied to some other structures.
Keywords : Thermodynamic quantities, cubic gauche nitrogen, macroscopic Grüneisen parameter