Molybdenum sound velocity and shear modulus softening under shock compression

Autor:	Jeffrey H. Nguyen, W. Patrick Ambrose, Dayne Fratanduono, Neil C. Holmes, Ricky Chau, Minta Akin, Paul D. Asimow, O. V. Fat'yanov
Rok vydání:	2014
Předmět:	Shear modulus Phase transition Materials science Condensed matter physics Shock (fluid dynamics) Speed of sound Phase (matter) Extrapolation Composite material Condensed Matter Physics Compression (physics) Softening Electronic Optical and Magnetic Materials
Zdroj:	Physical Review B. 89
ISSN:	1550-235X 1098-0121
DOI:	10.1103/physrevb.89.174109
Popis:	We measured the longitudinal sound velocity in Mo shock compressed up to 4.4 Mbars on the Hugoniot. Its sound speed increases linearly with pressure up to 2.6 Mbars; the slope then decreases up to the melting pressure of ∼3.8 Mbars. This suggests a decrease of shear modulus before the melt. A linear extrapolation of our data to 1 bar agrees with the ambient sound speed. The results suggest that Mo remains in the bcc phase on the Hugoniot up to the melting pressure. There is no statistically significant evidence for a previously reported bcc→hcp phase transition on the Hugoniot.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8c25dce7f6f747ce4a2c6310bb0dc75a https://doi.org/10.1103/physrevb.89.174109 Zobrazit plný text záznamu