Improving the understanding of the melting behaviour of Mo, Ta, and W at extreme pressures

2004/08/31 by Daniel Errandonea
Earth and Planetary Sciences · Engineering · Physics and Astronomy · #Advanced Chemical Physics Studies #Archaeology #Environmental science #Geography #High-pressure geophysics and materials #Materials science #Melting pot #Metallurgical Processes and Thermodynamics #Metallurgy #Physics #Thermodynamics #cond-mat.mtrl-sci

paper · pdf · doi:10.1016/j.physb.2004.11.087

published as Physica B: Condensed Matter 357, 356 (2005) · 23 pages, 4 figures, 1 table

arxiv created 2004/11/30 · openalex publication_date 2005/01/04 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We discus existent conflicts between experimentally measured and theoretically calculated melting curves of Mo, Ta, and W. By assuming that vacancy formation plays a fundamental role in the melting process, an explanation for the measured melting curves is provided. Furthermore, we show that the Lindemann law fits well all the measured melting curves of bcc transition metals if the Grueneisen parameter is written as a power series of the interatomic distance. For completeness, we examine possible reasons for current disagreements between shock-wave and DAC experiments. To solve them, we propose the existence of an extra high P-T phase for Mo, Ta, and W

Citations

• Analysis of dislocation mechanism for melting of elements: Pressure dependence
• Analytic model of the shear modulus at all temperatures and densities
• High‐pressure experiments and the phase diagram of lower mantle and core materials
• Molecular dynamics study of melting of the bcc metal vanadium. I. Mechanical melting