PHASE TRANSITION IN PYROXENITE UNDER SHOCK LOADING
S. A. Bordzilovskii, S. M. Karakhanov, A. I. Turkin, A. S. Yunoshev, V. M. Titov
Keywords: shock waves, pyroxenite, pyroxene, phase transition, VISAR, laser interferometry
Pages: 367-373
Abstract
Shock loading of natural pyroxenite samples and synthetic pyroxene samples sintered from a mixture of oxides with stoichiometry Mg0.9Fe0.1SiO3 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 ≈ 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.
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