title: Sound velocity measurements by x-ray shadowgraph technique for melting phenomena at ultrahigh-pressure regime.
abstract: Developments in measuring sound velocity of matter under ultrahigh pressure are described. We employed a time-resolved x-ray shadowgraph technique to measure the sound velocity of shock-compressed diamond and iron foils at around melt. The sound velocity significantly dropped at melting, a behavior that has been difficult to clarify by conventional measurements by subtracting particle velocity from shock velocity (u(s) - u(p)). In addition to sound velocity, other important parameters were also obtained simultaneously.
authors.affiliation: Institute of Laser Engineering, Osaka University, Suita, Osaka, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Shigemori
authors.forename: T
authors.initials: T
authors.lastname: Sakaiya
authors.forename: Y
authors.initials: Y
authors.lastname: Asakura
authors.forename: T
authors.initials: T
authors.lastname: Kondo
authors.forename: K
authors.initials: K
authors.lastname: Shimizu
authors.forename: T
authors.initials: T
authors.lastname: Kadono
authors.forename: Y
authors.initials: Y
authors.lastname: Hironaka
authors.forename: H
authors.initials: H
authors.lastname: Azechi