High-temperature elastic constants of platinum single crystals

Collard, Stephen M.; McLellan, Rex B.

doi:10.1016/0956-7151(92)90011-3

Cited by 59 publications

(21 citation statements)

References 7 publications

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“…where B is the isothermal bulk modulus, obtained from the literature [35][36][37][38][39] , v is the specific volume 40,41 and α is the linear coefficient of thermal expansion 40,41 , and all must be taken at the temperature T ′ . 2 The anharmonic contribution to the phonon entropy (∆S ph,Anh ) and the nonharmonic contribution (∆S ph,NH ) are…”

Section: Entropymentioning

confidence: 99%

Phonon anharmonicity and components of the entropy in palladium and platinum

Shen

Tang

et al. 2016

Phys. Rev. B

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Inelastic neutron scattering was used to measure the phonon density of states in fcc palladium and platinum metal at temperatures from 7 K to 1576 K. Both phonon-phonon interactions and electronphonon interactions were calculated by methods based on density functional theory (DFT), and were consistent with the measured shifts and broadenings of phonons with temperature. Unlike the longitudinal modes, the characteristic transverse modes had a nonlinear dependence on temperature owing to the requirement for a population of thermal phonons for upscattering. Kohn anomalies were observed in the measurements at low temperature, and were reproduced by calculations based on DFT. Contributions to the entropy from phonons and electrons were assessed and summed to obtain excellent agreement with prior calorimetric data. The entropy from thermal expansion is positive for both phonons and electrons, but larger for phonons. The anharmonic phonon entropy is negative in Pt, but in Pd it changes from positive to negative with increasing temperature. Owing to the position of the Fermi level on the electronic DOS, the electronic entropy was sensitive to the adiabatic electron-phonon interaction in both Pd and Pt. The adiabatic EPI depended strongly on thermal atom displacements.

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Section: Entropymentioning

confidence: 99%

Phonon anharmonicity and components of the entropy in palladium and platinum

Shen

Tang

et al. 2016

Phys. Rev. B

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“…Specially, the study of melting under compression is important for improving the knowledge of the interior of planets and other celestial bodies, since most of their interiors are in a liquid state under high pressure. In recent years, the amount of available experimental data on melting at high pressure has increased considerably [1][2][3][4][5][6][7][8][9][10][11][12][13]. As is known, melting at high pressure can be measured mainly by means of in situ laser-heated diamond-anvil cells (DAC) [1 -12] and through shock-wave experiments [14 -16].…”

Section: Introductionmentioning

confidence: 99%

Melting of tantalum at high pressure determined by angle dispersive x-ray diffraction in a double-sided laser-heated diamond-anvil cell

Errandonea

Somayazulu

Häusermann

et al. 2003

J. Phys.: Condens. Matter

122

120

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The high pressure and high temperature phase diagram of Ta has been studied in a laser-heated diamond-anvil cell (DAC) using x -ray diffraction measurements up to 52 GPa and 3800 K. The melting was observed at nine different pressures, being the melting temperature in good agreement with previous laser-heated DAC experiments, but in contradiction with several theoretical calculations and previous pistoncylinder apparatus experiments. A small slope for the melting curve of Ta is estimated ( dT m /dP ˜ 24 K/GPa at 1 bar) and a possible explanation for this behaviour is given. Finally, a P -V-T equation of states is obtained, being the temperature dependence of the thermal expansion coefficient and the bulk modulus estimated.

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“…Waldorf [23] used the pulse-echo technique to measure the bulk modulus of fcc Pb, as seen in Fig.6. Collard and Mclellan [24] used pulse-echo technique to measure the young's modulus of fcc Pt, as seen in Fig.7. For the bulk modulus of fcc Pt, the data from Collard and Mclellan [24] along with the measured values from Dorogokupets and Oganov [25] show a good agreement with the assessment.…”

Section: Temperature Dependence Of Elastic Properties Of Bcc Fe and Fmentioning

confidence: 99%

Establishment of the Elastic Property Database of Fe-base Alloys

Su¹,

He²,

Liu³

et al. 2015

Proceedings of the First International Conference on Information Sciences, Machinery, Materials and Energy

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Abstract. The elastic properties, including bulk modulus and Young's modulus, for the bcc and fcc phases of Fe-base alloys have been studied at room temperature and atmospheric pressure. The temperature dependence of the elastic properties of the elemental metals, i.e. Fe, Al… and .., has been modeled by using the CALPHAD approach and the first-principles calculations. Reasonable model parameters have been obtained giving a best description of most experimental data.

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High-temperature elastic constants of platinum single crystals

Cited by 59 publications

References 7 publications

Phonon anharmonicity and components of the entropy in palladium and platinum

Phonon anharmonicity and components of the entropy in palladium and platinum

Melting of tantalum at high pressure determined by angle dispersive x-ray diffraction in a double-sided laser-heated diamond-anvil cell

Establishment of the Elastic Property Database of Fe-base Alloys

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