TITLE

Quasi-dynamic pressure and temperature initiated β↔δ solid phase transitions in HMX

AUTHOR(S)
Zaug, Joseph M.; Farber, Daniel L.; Craig, Ian M.; Blosch, Laura L.; Shuh, David K.; Hansen, Donald W.; Aracne-Ruddle, Chantel M.
PUB. DATE
April 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 505 Issue 1, p695
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The phase transformation of β-HMX (> 0.5% RDX) to δ phase has been studied for over twenty years and more recently with an high-contrast optical second harmonic generation technique. Shock studies of the plastic binder composites of HMX have indicated that the transition is perhaps irreversible, a result that concurs with the static pressure results published by F. Goetz et al. [1] in 1978. However, the stability field favors the β polymorph over δ as pressure is increased (up to 5.4 GPa) along any thermodynamically reasonable isotherm. In this experiment, strict control of pressure and temperature is maintained while x-ray and optical diagnostics are applied to monitor the conformational dynamics of HMX. Unlike the temperature induced β -> δ transition, the pressure induced is heterogeneous in nature. The 1 bar 25°C δ -> β transition is not immediate, occuring over tens of hours. Transition points and kinetics are path dependent and consequently this paper describes our work in progress.
ACCESSION #
5985425

 

Related Articles

  • Role of Internal Pressure in a Ferroelastic Phase Transition. Goryaınov, S. V.; Ovsyuk, N. N. // Journal of Experimental & Theoretical Physics;Oct2000, Vol. 91 Issue 4, p786 

    It is shown that the driving force of a ferroelastic phase transition is internal pressure. The pressure gives rise to symmetric deformation, whose energy accumulates as pressure increases and, at the phase transition point, is partially transferred into the energy of antisymmetric deformations.

  • Pressure-induced ferroelectric-antiferroelectric phase transitions in lead zirconate-tatanate-based solid solutions. Spiridonov, N.; Ishchuk, V.; Kisel', N.; Spiridonov, V. // Physics of the Solid State;May2012, Vol. 54 Issue 5, p930 

    The ferroelectric-antiferroelectric phase transitions induced by hydrostatic pressure in solid solutions based on lead zirconate-titanate (PZT) with introducing 20 at % tin into B sites and composites based on these ceramics have been studied. In the composites with the same composition of solid...

  • Pressure and light effects on the phase transition of deuterated Cu(2,5-dimethyl-dicyanoquinonediimine)2. Gómez, D.; Schmitt, H.; von Schütz, J. U.; Wachtel, H.; Wolf, H. C. // Journal of Chemical Physics;3/15/1996, Vol. 104 Issue 11, p4198 

    The deuterated dicyanoquinonediimine salt Cu(2-CD3,5-CD3-DCNQI)2, (d6), a highly conductive organic metal, exhibits a phase transition from the metallic to the insulating state at Tc≊60 K. In a wide temperature range we observe an anticoincidence of high conductivity and electron spin...

  • Pressure-induced phase transition in mixed-valence gold complexes Cs[sub 2]Au[sub 2]X[sub 6]... Liu, X.J.; Moritomo, Y. // Journal of Chemical Physics;5/8/1999, Vol. 110 Issue 18, p9174 

    Investigates the effects of hydrostatic pressure-induced phase transformation on Raman spectra in mixed-valence gold complexes. Observations of pressure-induced deactivation of the Raman-active gold stretching modes; Indications of pressure-induced phase transition from the multiple valence...

  • Configurations and observables in an Ising model with heat flow. Agliari, E.; Casartelli, M.; Vezzani, A. // European Physical Journal B -- Condensed Matter;Dec2007, Vol. 60 Issue 4, p499 

    We study a two dimensional Ising model between thermostats at different temperatures. By applying the recently introduced KQ dynamics, we show that the system reaches a steady state with coexisting phases transversal to the heat flow. The relevance of such complex states on thermodynamic or...

  • Second order phase transition temperature of single crystals of Gd5Si1.3Ge2.7 and Gd5Si1.4Ge2.6. Hadimani, R. L.; Melikhov, Y.; Schlagel, D. L.; Lograsso, T. A.; Dennis, K. W.; McCallum, R. W.; Jiles, D. C. // Journal of Applied Physics;2015, Vol. 117 Issue 17, p17D106-1 

    Gd5(SixGe1-x)4 has mixed phases in the composition range 0.32

  • On-line p,T calibration based on well-known phase transitions. Secco, R. A.; Schloessin, H. H. // Journal of Applied Physics;9/1/1986, Vol. 60 Issue 5, p1625 

    Presents a study which examined on-line pressure and temperature calibrations based on phase transitions. Use of the fluid encapsulation technique; Details of the phase diagrams of several materials for determining the pressure-temperature coordinations; Characteristics of transition...

  • New high-pressure phases of lithium. Hanfland, M.; Syassen, K.; Christensen, N.E.; Novikov, D.L. // Nature;11/9/2000, Vol. 408 Issue 6809, p174 

    Reports on an experiment using synchrotron X-ray diffraction measurements which confirm that Lithium undergoes pronounced structural changes under pressure. Transformation of the element from a high-pressure face-centered-cubic phase to a cubic polymorph; Uniqueness of the transaction;...

  • Phase transition in the layered perovskite CsScF[sub 4] induced by hydrostatic pressure. Aleksandrov, K. S.; Vtyurin, A. N.; Shmygol’, I. V.; Goryaınov, S. V. // Physics of the Solid State;Sep99, Vol. 41 Issue 9, p1541 

    Using polarization microscopy and Raman scattering, we have discovered a new phase transition in the layered perovskite crystal CsScF[sub 4] under a hydrostatic pressure around 6 GPa. The proposed space group of the high-pressure phase is C²[sub 2h], Z = 4.

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