Successive phase transitions of tin under shock compression

Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, Chinese Academy of Engineering Physics, P.O. Box 919-102, Mianyang, Sichuan 621900, People’s Republic of China
Applied Physics Letters (Impact Factor: 3.3). 04/2008; 92(11):111905 - 111905-3. DOI: 10.1063/1.2898891
Source: IEEE Xplore


Longitudinal and bulk sound velocities of tin in the shock pressure range from ∼25 to ∼80 GPa were measured using a direct reverse-impact method. The bct to bcc phase transition along the Hugoniot was identified by the discontinuity of the longitudinal sound velocity against shock pressure. The incipient melting on the Hugoniot was also revealed by the transition from longitudinal to bulk sound velocity. The shock pressure for bct-bcc phase transition and incipient melting were constrained to be ∼35 and ∼45 GPa , respectively. It is inferred that the bcc phase possesses higher shear modulus than the bct phase.

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    ABSTRACT: The response of graphitelike boron-carbon phases to shock wave loading has been investigated using short laser-driven pressure pulses. The main motivation, related to wide technological applications, was to study the possibility to synthesize via dynamic compression the B-doped diamond produced recently under high static pressures and temperatures. Over the explored range of shock pressure, no formation of such diamondlike phase has been observed. Instead, Raman and x-ray diffraction studies of the recovered samples have shown presence of mixtures of disordered graphite and boron carbide. Quantitative analysis of shock and release wave propagation in the multilayered targets has been performed, combining time-resolved measurements and simulations. It was found that despite the high amplitudes of the laser shocks, up to about 70 GPa, the pressure and temperature transmitted into the B-C specimens probably outlaid the p-T conditions required for the phase transition into diamondlike structures.
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    ABSTRACT: We undertake a numerical simulation of shock experiments on tin reported in the literature, by using a multiphase equation of state (MEOS) and a multiphase Steinberg Guinan (MSG) constitutive model for tin in the β, γ and liquid phases. In the MSG model, the Bauschinger effect is considered to better describe the unloading behavior. The phase diagram and Hugoniot of tin are calculated by MEOS, and they agree well with the experimental data. Combined with the MEOS and MSG models, hydrodynamic computer simulations are successful in reproducing the measured velocity profile of the shock wave experiment. Moreover, by analyzing the mass fraction contour as well as stress and temperature profiles of each phase for tin, we further discuss the complex behavior of tin under shock-wave loading.
    No preview · Article · May 2009 · Chinese Physics Letters
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    ABSTRACT: Tin has a complex phase diagram, which can be explained by presence of structural phase transitions. The fracture in the dependence of sound velocity on pressure is caused by structural transitions in shock-compressed substance. Therefore, basing on measurement of sound velocities, it is possible to reveal phase transitions of substance along shock adiabat, including its melting. The results of different authors give the melting range of tin from 35 up to 93 GPa. In this work tin samples with initial density of 7.28 g/cm^3 were loaded with use of HE-based generators of shock waves. In the pressure range of 30-150 GPa, sound velocity in tin was measured by the method of overtaking release with use of the optical gauges and the indicator liquids: carbogal, tetrachlormethane, and bromoform. Up to shock compression pressures of about 35 GPa, sound velocity was measured by the method of oncoming release with use of piezoresistive manganin-based gauges. The obtained data testifies that the melting range of tin is ˜6390 GPa.
    Full-text · Article · Jun 2009
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