Response of the mode Gr++neisen parameters with anisotropic compression: A pressure and temperature dependent Raman study of +¦ -Sn

Jasmine K. Hinton; Christian Childs; Dean Smith; Paul B. Ellison; Keith V. Lawler; Ashkan Salamat

doi:10.1103/PhysRevB.102.184112

Response of the mode Gr++neisen parameters with anisotropic compression: A pressure and temperature dependent Raman study of +¦ -Sn

Jasmine K. Hinton, Christian Childs, Dean Smith, Paul B. Ellison, Keith V. Lawler, Ashkan Salamat

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9 Scopus citations

Abstract

The lattice dynamic response of body-centered tetragonal +¦-Sn (I41/amd) under high-pressure and -temperature conditions is determined using experimental optical vibration modes. Raman scattering is used to map the phase stability region of +¦-Sn to perform mode Gr++neisen analysis, and we demonstrate the necessity of an optical intensity calibration for Raman thermometry. The Gr++neisen tensor is evaluated along a set of isotherms to address shortcomings of single-mode Gr++neisen parameters with respect to anisotropic deformations of this tetragonal structured soft metal. The changes observed here in the Gr++neisen tensor as a function of temperature are related to anharmonicity and denote potential criteria for the onset of premelting.

Original language	English
Article number	184112
Journal	Physical Review B
Volume	102
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevB.102.184112
State	Published - Nov 23 2020

Funding

We thank B. O'Donnell and R. Salem for useful discussions and protocol development. This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, under Award DE-SC0020303.

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title = "Response of the mode Gr++neisen parameters with anisotropic compression: A pressure and temperature dependent Raman study of +¦ -Sn",

abstract = "The lattice dynamic response of body-centered tetragonal +¦-Sn (I41/amd) under high-pressure and -temperature conditions is determined using experimental optical vibration modes. Raman scattering is used to map the phase stability region of +¦-Sn to perform mode Gr++neisen analysis, and we demonstrate the necessity of an optical intensity calibration for Raman thermometry. The Gr++neisen tensor is evaluated along a set of isotherms to address shortcomings of single-mode Gr++neisen parameters with respect to anisotropic deformations of this tetragonal structured soft metal. The changes observed here in the Gr++neisen tensor as a function of temperature are related to anharmonicity and denote potential criteria for the onset of premelting.",

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AU - Ellison, Paul B.

AU - Lawler, Keith V.

AU - Salamat, Ashkan

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AB - The lattice dynamic response of body-centered tetragonal +¦-Sn (I41/amd) under high-pressure and -temperature conditions is determined using experimental optical vibration modes. Raman scattering is used to map the phase stability region of +¦-Sn to perform mode Gr++neisen analysis, and we demonstrate the necessity of an optical intensity calibration for Raman thermometry. The Gr++neisen tensor is evaluated along a set of isotherms to address shortcomings of single-mode Gr++neisen parameters with respect to anisotropic deformations of this tetragonal structured soft metal. The changes observed here in the Gr++neisen tensor as a function of temperature are related to anharmonicity and denote potential criteria for the onset of premelting.

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Response of the mode Gr++neisen parameters with anisotropic compression: A pressure and temperature dependent Raman study of +¦ -Sn

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