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Title: Separating the configurational and vibrational entropy contributions in metallic glasses

Journal Article · · Nature Physics
DOI:https://doi.org/10.1038/nphys4142· OSTI ID:1471839
 [1];  [2];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [3];  [4]; ORCiD logo [5];  [6]; ORCiD logo [6];  [1];  [1]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States. Dept. of Applied Physics and Materials Science
  2. Univ. of California, Riverside, CA (United States). Dept. of Mechanical Engineering
  3. Air Force Research Lab. (AFRL), Wright-Patterson AFB, OH (United States)
  4. California State Univ. Channel Islands (CI), Camarillo, CA (United States). Dept. of Applied Physics
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Data Analysis and Visualization Division
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division

Glassy materials exist in nature and play a critical role in technology, but key differences between the glass, liquid and crystalline phases are not well understood. Over several decades there has been controversy about the specific heat absorbed as a glass transforms to a liquid—does this originate from vibrational entropy or configurational entropy? We report direct in situ measurements of the vibrational spectra of strong and fragile metallic glasses in the glass, liquid and crystalline phases. For both types of material, the measured vibrational entropies of the glass and liquid show a tiny excess over the crystal, representing less than 5% of the total excess entropy measured with step calorimetry. These results reveal that the excess entropy of metallic glasses is almost entirely configurational in origin, consistent with the early theories of Gibbs and co-workers describing the glass transition as a purely configurational transition.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
AC05-00OR22725; FG02-03ER46055; DMR-0520547
OSTI ID:
1471839
Journal Information:
Nature Physics, Vol. 13, Issue 9; ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 41 works
Citation information provided by
Web of Science

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Cited By (10)

Free energy and entropy of a dipolar liquid by computer simulations journal February 2018
Polytetrahedral structure and glass-forming ability of simulated Ni–Zr alloys journal October 2018
Configurational entropy of glass-forming liquids journal April 2019
Does the Adam-Gibbs relation hold in simulated supercooled liquids? journal August 2019
Super-resolution energy spectra from neutron direct-geometry spectrometers journal October 2019
Multi-scale dynamics at the glassy silica surface journal November 2019
Atomistic structural mechanism for the glass transition: Entropic contribution journal January 2020
Event-based processing of neutron scattering data at the Spallation Neutron Source journal May 2018
Does the Adam-Gibbs relation hold in simulated supercooled liquids? text January 2019
Dimensional ensemble and (topological) fracton thermodynamics: the slow route to equilibrium journal September 2019

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