Change in Thermophysical Properties and Melting Temperature of Niobium with Increasing Pressure

Kramynin, S.P.; Akhmedov, E.N.

doi:10.1134/s0031918x19110097

Cited by 1 publication

(5 citation statements)

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Section: Niobiumsupporting

confidence: 53%

“…The equation of state and various BCC-Nb properties with interatomic potential parameters (22) were calculated in [42,43] by the method from (8)− (15). In [42], the baric dependences of various BCC-Nb properties were calculated along isotherms 300 and 3000 K in the pressure range P = 0−200 GPa, and the results show good agreement with the experimental and calculated data obtained by others. These calculations were generalized in [43] for a nanocrystal from a finite number of atoms and variations of baric dependences were studied with reduction of nanocrystal size or shape deformation BCC-Nb.…”

Section: Niobiumsupporting

confidence: 53%

“…has a bodycentered cubic (BCC) structure (k o n = 8, k p = 0.6802), though, it is reported that BCC-Nb at P > 6 GPa can transfer to orthorhombic Pnma-phase [40]. Dependence T m (P) for BCC-Nb was theoretically calculated in [40][41][42][43][44] by various methods.…”

Section: Niobiummentioning

confidence: 99%

“…BCC-Nb parameters of pair interatomic potential (8) were determined using a self-consistency method in [42], and have the following values:…”

Section: Niobiummentioning

confidence: 99%

“…These calculations were generalized in [43] for a nanocrystal from a finite number of atoms and variations of baric dependences were studied with reduction of nanocrystal size or shape deformation BCC-Nb. However, dependence T m (P) for BCC-Nb in [42,43] was calculated using equation (16) at T m (0) = 2742 K. Here, we also calculated dependence T m (P) using both equations ( 16) and (17) at T m (0) = 2750 K.…”

Section: Niobiummentioning

confidence: 99%

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Change in the melting temperature of metals with an increase in pressure

Magomedov M. N.

2023

Physics of the Solid State

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A new analytical (i.e., without computer modeling) method for calculating the dependence of the melting temperature Tm of a single-component crystal on pressure P is proposed. The method is based on the delocalization melting criterion and does not contain fitting constants. The baric dependences of the melting temperature Tm(P) and its pressure derivative T'm(P) for gold, platinum and niobium in the pressure range: P=0-1000 GPa were calculated by this method. It was shown that the dependences calculated by this method for gold and platinum agree better with the experimental data than the dependences obtained by computer simulation methods. For niobium, the calculated dependence Tm(P) turned out to be steeper, i.e., the value T'm(P) turned out to be larger than in the experiment. It was indicated that this discrepancy might be due both to a decrease in the Lindemann parameter with increasing pressure and to a redistribution of electrons on the s-d-orbitals during compression of transition metals with a BCC structure. Keywords: melting point, pressure, interatomic interaction, gold, platinum, niobium.

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