New materials from high pressure experiments: Challenges and opportunities

McMillan, Paul F.

doi:10.1080/0895795031000109733

Cited by 38 publications

(26 citation statements)

References 68 publications

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“…However, as the strength of the tension increases, the lifetime of this metastable state diminishes, and one can define a 'maximum tensile strength' as being the tensile strength at which the lifetime of the metastable state is essentially zero on a laboratory timescale. For liquids this is, from the equation of state as an upper/elastic limit, about 1 GPa for infinitely fast stretching (but typically only a few hundred bar in practice on the laboratory i.e., greater than a second timescale), whereas for solids the practical stability limit is typically several GPa [4]. Stretched liquids relax along the liquid-vapour co-existence envelope in the pressure-density plane, whereas for solids this can be either solid-vapour or solid-liquid, depending on the slope of the melting curve in the pressure-density plane.…”

Section: Introductionmentioning

confidence: 98%

Liquids at negative pressure

Xiao

Heyes²,

Powles

2005

Physica Status Solidi (b)

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We have further explored the final stages of the collapse of an unstable cavity or bubble using the Molecular Dynamics computer simulation technique. A nanometre sized spherical volume of molecules was removed from a bulk Lennard -Jones liquid, which being mechanically and thermodynamically unstable, proceeded to collapse. The molecules with the highest kinetic energy were the first to enter the initially empty cavity. The temperature of individual molecules inside the cavity, while the density was still typical of a gas, could reach at least an order of magnitude larger than that of the surrounding liquid, e.g., equivalent to 6, 000 K for water, which is not unreasonable for the sonoluminescence effect to be seen. During the filling in of the cavity, the average temperature decreased, as the contents thermally equilibrated with the surrounding liquid. The bubble partially filled in, and then proceeded to partially empty again, and so on in an oscillatory manner, with ever decreasing amplitude towards the final uniform liquid state. This 'recoil' effect is predicted by classical hydrodynamic treatments and has been observed in experiment for much larger bubbles. The temperature, density and normal pressure component were resolved as a function of radius from the centre of the bubble at selected times during the collapsing process. The simulations support the view that MD can provide a realistic representation of the final stages of cavity collapse. It does not make assumptions about equation of state and transport coefficients as would be required for a comparable solution of the Navier -Stokes hydrodynamics equations, and is therefore an especially appropriate description for the final stages of the collapse.

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Section: Introductionmentioning

confidence: 98%

Liquids at negative pressure

Xiao

Heyes²,

Powles

2005

Physica Status Solidi (b)

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“…Both the melting temperature and the glass temperature strongly change on pressurization [1][2][3][4][5][6][7][8][9]. The reliable and simple parameterizations of T g (P) and T m (P) dependences are important both from the fundamental [1][2][3][4][5][6][7][8][9] and the practical point of view [9][10][11][12][13][14][15][16][17]. The latter covers applications in geology and geophysics [10][11][12], pharmaceutical industry [13,14], food preservation [14,15] and in the modern material engineering [16,17].…”

Section: Introductionmentioning

confidence: 99%

“…The reliable and simple parameterizations of T g (P) and T m (P) dependences are important both from the fundamental [1][2][3][4][5][6][7][8][9] and the practical point of view [9][10][11][12][13][14][15][16][17]. The latter covers applications in geology and geophysics [10][11][12], pharmaceutical industry [13,14], food preservation [14,15] and in the modern material engineering [16,17]. Reliable portraying of T g (P) and T m (P) evolutions is also significant for pressure-temperature equations of states, which make ultimate verifications of theoretical predictions possible [1-4, and references therein].…”

Section: Introductionmentioning

confidence: 99%

On the pressure evolution of the melting temperature and the glass transition temperature

Drozd-Rzoska

Rzoska

Imre

2007

Journal of Non-Crystalline Solids

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“…Compression rates can lead to kinetically impeded transformations and even the formation of metastable phases. 6,7 To study the influence of compressions rates on the physical properties of materials, we have developed a novel device, called the dynamic Diamond Anvil Cell (dDAC).…”

Section: Introductionmentioning

confidence: 99%

Dynamic diamond anvil cell (dDAC): A novel device for studying the dynamic-pressure properties of materials

Evans

Yoo

Lee

et al. 2007

Review of Scientific Instruments

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We have developed a unique device, a dynamic diamond anvil cell (dDAC), which repetitively applies a time-dependent load/pressure profile to a sample. This capability allows studies of the kinetics of phase transitions and metastable phases at compression (strain) rates of up to 500 GPa/sec (~0.16 s -1 for a metal). Our approach adapts electromechanical piezoelectric actuators to a conventional diamond anvil cell design, which enables precise specification and control of a time-dependent applied load/pressure. Existing DAC instrumentation and experimental techniques are easily adapted to the dDAC to measure the properties of a sample under the varying load/pressure conditions. This capability addresses the sparsely studied regime of dynamic phenomena between static research (diamond anvil cells and large volume presses) and dynamic shock-driven experiments (gas guns, explosive and laser shock). We present an overview of a variety of experimental measurements that can be made with this device.

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New materials from high pressure experiments: Challenges and opportunities

Cited by 38 publications

References 68 publications

Liquids at negative pressure

Liquids at negative pressure

On the pressure evolution of the melting temperature and the glass transition temperature

Dynamic diamond anvil cell (dDAC): A novel device for studying the dynamic-pressure properties of materials

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