Phase transition in pyroxenite under shock loading

S. A. Bordzilovskii^ab, S. M. Karakhanov^a, A. I. Turkin^c, A. S. Yunoshev^ab, V. M. Titov<sup>a

a</sup> Lavrentyev Institute of Hydrodynamics of Siberian Branch of the Russian Academy of Sciences, Novosibirsk, 630090, Russia
^b Novosibirsk State University, Novosibirsk, 630090, Russia
^c Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russia

Abstract: Shock loading of natural pyroxenite samples and synthetic pyroxene samples sintered from a mixture of oxides with stoichiometry Mg$_{0.9}$Fe$_{0.1}$SiO$_3$ was investigated. X-ray analysis of the recovered material was performed. Particle velocity profiles recorded by laser interferometry indicate the existence of a phase transition at a pressure of $\approx$ 60 GPa. At this pressure, the Lagrangian sound velocity in the shock-loaded samples of natural pyroxenite is 13.9 km/s. From an evaluation of the compression, the Eulerian sound velocity is 9.4 km/s.

Keywords: VISAR, shock waves, pyroxenite, pyroxene, phase transition, VISAR, laser interferometry.

UDC: 532.12+532.593

Received: 17.05.2012

 English version: Combustion, Explosion and Shock Waves, 2013, 49:3, 367–373

Bibliographic databases:

•