2012/01/31 by Jianbo Hu, Chengda Dai, Yuying Yu +9 · 37 citations
Earth and Planetary Sciences · Engineering · Materials Science · Physics and Astronomy · #Acoustics #Composite material #Compression (physics) #Diamond and Carbon-based Materials Research #Discontinuity (linguistics) #Dynamic range compression #High-pressure geophysics and materials #Interferometry #Materials science #Mechanics #Metal and Thin Film Mechanics #Metallurgy #Optics #Physics #Range (aeronautics) #Shock (circulatory) #Shock wave #Sound (geography) #Speed of sound #Tantalum #Thermodynamics #Volume (thermodynamics) #cond-mat.mtrl-sci
paper · pdf · doi:10.1063/1.3681815
published in Journal of Applied Physics 111(3) (American Institute of Physics)
openalex publication_date 2012/02/01 · arxiv created 2012/02/16 · arxiv updated 2015/06/03 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The high-pressure melting curve of tantalum (Ta) has been the center of a long-standing controversy. Sound velocities along the Hugoniot curve are expected to help in understanding this issue. To that end, we employed a direct-reverse impact technique and velocity interferometry to determine sound velocities of Ta under shock compression in the 10-110 GPa pressure range. The measured longitudinal sound velocities show an obvious kink at ∼60 GPa as a function of shock pressure, while the bulk sound velocities show no discontinuity. Such observation could result from a structural transformation associated with a negligible volume change or an electronic topological transition.