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Title: Vibrational dynamics in the undercooled liquid of ultra-fragile metallic glasses

Abstract

Here, the lattice vibrational dynamics in ultra-fragile Pt57Cu23P20 and Pt60Cu20P20 glasses were investigated using in situ inelastic neutron scattering to measure the evolution of the phonon density of states (DOS) through the glass transition, into the undercooled liquid phase, and through crystallization. The phonon DOS curves are remarkably similar for the undercooled liquids and the amorphous solids. The vibrational entropy was obtained with these phonon DOS curves, and changes in vibrational entropy caused by the glass transition are less than 0.05 kB/atom. For these highly fragile metal/metalloid glasses, the excess vibrational entropy of the undercooled liquid is about 0.5–1.5 Jmol-1 K-1, compared to 0.1 Jmol-1 K-1 reported earlier for stronger Cu–Zr glasses. Our work suggests that, consistent with our previous report for less fragile metallic glasses, the fraction of the total excess entropy that is vibrational is small, and the discontinuity in excess entropy at the glass transition is mainly due to configurational entropy.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2];  [2];  [1]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [4];  [5];  [5]; ORCiD logo [2]
  1. Swarthmore College, Swarthmore, PA (United States)
  2. California Institute of Technology (CalTech), Pasadena, CA (United States)
  3. Univ. of Pennsylvania, Philadelphia, PA (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Glassimetal Technology Inc., Pasadena, CA (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); American Chemical Society Petroleum Research Fund (ACS-PRF)
OSTI Identifier:
1965216
Grant/Contract Number:  
AC05-00OR22725; FG02-03ER46055; 62045-UNI10
Resource Type:
Accepted Manuscript
Journal Name:
Materialia
Additional Journal Information:
Journal Volume: 27; Journal ID: ISSN 2589-1529
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; metallic glasses; glass transition; liquids; glass; neutron scattering

Citation Formats

Smith, Hillary L., Saunders, Claire N., Bernal-Choban, Camille, Lohaus, Stefan H., Stoddard, Colby J., Decker, Lucy K., Lin, Jiao Y. Y., Niedziela, Jennifer L., Abernathy, Douglas L., Na, Jong-Hyun, Demetriou, Marios D., and Fultz, B. Vibrational dynamics in the undercooled liquid of ultra-fragile metallic glasses. United States: N. p., 2023. Web. doi:10.1016/j.mtla.2023.101710.
Smith, Hillary L., Saunders, Claire N., Bernal-Choban, Camille, Lohaus, Stefan H., Stoddard, Colby J., Decker, Lucy K., Lin, Jiao Y. Y., Niedziela, Jennifer L., Abernathy, Douglas L., Na, Jong-Hyun, Demetriou, Marios D., & Fultz, B. Vibrational dynamics in the undercooled liquid of ultra-fragile metallic glasses. United States. https://doi.org/10.1016/j.mtla.2023.101710
Smith, Hillary L., Saunders, Claire N., Bernal-Choban, Camille, Lohaus, Stefan H., Stoddard, Colby J., Decker, Lucy K., Lin, Jiao Y. Y., Niedziela, Jennifer L., Abernathy, Douglas L., Na, Jong-Hyun, Demetriou, Marios D., and Fultz, B. Wed . "Vibrational dynamics in the undercooled liquid of ultra-fragile metallic glasses". United States. https://doi.org/10.1016/j.mtla.2023.101710. https://www.osti.gov/servlets/purl/1965216.
@article{osti_1965216,
title = {Vibrational dynamics in the undercooled liquid of ultra-fragile metallic glasses},
author = {Smith, Hillary L. and Saunders, Claire N. and Bernal-Choban, Camille and Lohaus, Stefan H. and Stoddard, Colby J. and Decker, Lucy K. and Lin, Jiao Y. Y. and Niedziela, Jennifer L. and Abernathy, Douglas L. and Na, Jong-Hyun and Demetriou, Marios D. and Fultz, B.},
abstractNote = {Here, the lattice vibrational dynamics in ultra-fragile Pt57Cu23P20 and Pt60Cu20P20 glasses were investigated using in situ inelastic neutron scattering to measure the evolution of the phonon density of states (DOS) through the glass transition, into the undercooled liquid phase, and through crystallization. The phonon DOS curves are remarkably similar for the undercooled liquids and the amorphous solids. The vibrational entropy was obtained with these phonon DOS curves, and changes in vibrational entropy caused by the glass transition are less than 0.05 kB/atom. For these highly fragile metal/metalloid glasses, the excess vibrational entropy of the undercooled liquid is about 0.5–1.5 Jmol-1 K-1, compared to 0.1 Jmol-1 K-1 reported earlier for stronger Cu–Zr glasses. Our work suggests that, consistent with our previous report for less fragile metallic glasses, the fraction of the total excess entropy that is vibrational is small, and the discontinuity in excess entropy at the glass transition is mainly due to configurational entropy.},
doi = {10.1016/j.mtla.2023.101710},
journal = {Materialia},
number = ,
volume = 27,
place = {United States},
year = {Wed Feb 08 00:00:00 EST 2023},
month = {Wed Feb 08 00:00:00 EST 2023}
}

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