About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Neutron and X-ray Scattering in Materials Science
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Presentation Title |
Inelastic Neutron Scattering Across the Melt: the Role of Vibrational Entropy in Latent Heat |
Author(s) |
Camille M. Bernal-Choban, Claire N Saunders, Yang Shen, Stefan Haegeli Lohaus, Vladimir Ladygin, Shiva Mudide, Douglas Abernathy, Brent Fultz |
On-Site Speaker (Planned) |
Camille M. Bernal-Choban |
Abstract Scope |
Advances in neutron scattering continue to address long-standing questions in materials physics. One persisting challenge that can now be studied in-situ is the solid to liquid transition, specifically, what role atomic motion has in the entropy of fusion. Here, we performed inelastic neutron scattering measurements on powder samples of Ge, Sn, Pb, and Bi from ambient temperature to 200 K above each melting temperature. Analyses of the spectra, informed by MCViNE simulations and vibrational-transit theory, were used to obtain the vibrational densities of states for the solid and liquid phases of each element. Preliminary results show a distinct contribution of atomic motion for Ge, Sn, Bi, and Pb, ranging from over 50% to less than 5% of the entropy of fusion. The changes in diffusional and collective motions of atoms across the melt will also be discussed. This work is supported by DOE BES award No. DE-FG02-03ER46055. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Temperature Materials, Phase Transformations, Other |