TITLE

High pressure phase transformation in iron under fast compression

AUTHOR(S)
Bastea, Marina; Bastea, Sorin; Becker, Richard
PUB. DATE
December 2009
SOURCE
Applied Physics Letters;12/14/2009, Vol. 95 Issue 24, p241911
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We observe kinetic features—velocity loops—at the α to ε phase transformation of iron, similar with the ones reported when water is frozen into its ice VII phase under comparable experimental conditions. By using a phase nucleation and growth kinetic model with pressure dependent phase interface velocity we find that the thermodynamic path followed by the sample is strongly dependent on the drive conditions and sample characteristics. The velocity loops become broader and shallower at slower compressions, while on faster time–scales, e.g., for laser drivers, the loops form at higher velocities and may eventually disappear.
ACCESSION #
47039142

 

Related Articles

  • Structural phase transitions of the B1— B2 type in small-sized ionic crystals. Karpenko, S. V.; Kyarov, A. Kh.; Temrokov, A. I. // Physics of the Solid State;Mar2006, Vol. 48 Issue 3, p570 

    The features of structural phase transitions that occur under high pressure are studied. The density functional theory is used to calculate the B1– B2 phase transition pressure as a function of the crystal size for small-sized alkali halide crystals. A size effect (an increase in the...

  • Nanoelectromechanics of polarization switching in piezoresponse force microscopy. Kalinin, S. V.; Gruverman, A.; Rodriguez, B. J.; Shin, J.; Baddorf, A. P.; Karapetian, E.; Kachanov, M. // Journal of Applied Physics;4/1/2005, Vol. 97 Issue 7, p074305 

    Nanoscale polarization switching in ferroelectric materials by piezoresponse force microscopy in weak and strong indentation limits is analyzed using exact solutions for coupled electroelastic fields under the tip. Tip-induced domain switching is mapped on the Landau theory of phase transitions,...

  • Kinetics of transformation with nucleation and growth mechanism: Special consideration of... Ge Yu; Lee, S.T.; Lai, J. K. L.; Ngai, L. // Journal of Applied Physics;1/1/1997, Vol. 81 Issue 1, p89 

    Describes the kinetics of phase transformation with nucleation and growth mechanisms. Crystallographic relationship in the epitaxial growth; Influence of the shape factor on the kinetics; Determination of the distribution during deposition.

  • On the theory of fog. Marchenko, V. I. // JETP Letters;7/10/96, Vol. 64 Issue 1, p66 

    It is pointed out that in first-order phase transitions nucleation stops when the supersaturation decreases by a small amount. A simple quantitative description of the next stage of the kinetics of the transition — the growth stage — is proposed. This stage lasts much longer than...

  • Nucleation in superheated liquid argon--krypton solutions. Baidakov, V.G.; Kaverin, A.M.; Boltachev, G.Sh. // Journal of Chemical Physics;4/1/1997, Vol. 106 Issue 13, p5648 

    Reports on nucleation-rate measurements in metastable liquid argon-krypton solutions over a wide temperature and concentration range. Consideration of the size effect in nucleation in the framework of the Van-der-Waals, Cahn-Hilliard method; Kinetics of a first order phase transition in binary...

  • Metastable phase decay on a wide spectrum of the heterogeneous centers activities. Kurasov, Victor // AIP Conference Proceedings;2000, Vol. 534 Issue 1, p257 

    © 2000 American Institute of Physics.

  • Initiation of a phase transition by preexisting nuclei. Shneidman, Vitaly A.; Hänggi, Peter // Journal of Chemical Physics;7/15/1994, Vol. 101 Issue 2, p1503 

    Preexisting nuclei are often invoked in situations where the observed kinetics of a phase transition is much faster than one would expect from the classical theory of homogeneous nucleation. We examine analytically the time-dependent effects produced by such nuclei. Corrections to the number of...

  • Simple correction to the classical theory of homogeneous nucleation. Nadykto, Alexey B.; Yu, Fangqun // Journal of Chemical Physics;3/8/2005, Vol. 122 Issue 10, p104511 

    Formation of the new disperse phase via homogeneous nucleation plays a fundamental role wherever the first-order phase transitions occur. Inconsistent temperature dependence of the nucleation rates and poor agreement of theoretical critical supersaturations with experimental data for a number of...

  • Inducing chalcogenide phase change with ultra-narrow carbon nanotube heaters. Feng Xiong; Liao, Albert; Pop, Eric // Applied Physics Letters;12/14/2009, Vol. 95 Issue 24, p243103 

    Carbon nanotube (CNT) heaters with sub-5 nm diameter induce highly localized phase change in Ge2Sb2Te5 (GST) chalcogenide. A significant reduction in resistance of test structures is measured as the GST near the CNT heater crystallizes. Effective GST heating occurs at currents as low as 25...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics