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Title: Applications and limitations of electron correlation microscopy to study relaxation dynamics in supercooled liquids

Here, electron correlation microscopy (ECM) is a way to measure structural relaxation times, τ, of liquids with nanometer-scale spatial resolution using coherent electron scattering equivalent of photon correlation spectroscopy. We have applied ECM with a 3.5 nm diameter probe to Pt 57.5Cu 14.7Ni 5.3P 22.5 amorphous nanorods and Pd 40Ni 40P 20 bulk metallic glass (BMG) heated inside the STEM into the supercooled liquid region. These data demonstrate that the ECM technique is limited by the characteristics of the time series, which must be at least 40τ to obtain a well-converged correlation function g 2(t), and the time per frame, which must be less than 0.1τ to obtain sufficient sampling. A high-speed direct electron camera enables fast acquisition and affords reliable g 2(t) data even with low signal per frame.
 [1] ;  [1] ;  [2] ;  [3] ;  [3] ;  [2] ;  [1]
  1. Univ. of Wisconsin, Madison, WI (United States)
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  3. Yale Univ., New Haven, CT (United States)
Publication Date:
Report Number(s):
IS-J-9384; IS-J-9364
Journal ID: ISSN 0304-3991; PII: S030439911630184X
Grant/Contract Number:
AC02-07CH11358; DMR-1506564; MRSEC DMR 1119826; SC0012704
Accepted Manuscript
Journal Name:
Additional Journal Information:
Journal Volume: 178; Journal Issue: C; Related Information: Also available at; Journal ID: ISSN 0304-3991
Research Org:
Ames Lab., Ames, IA (United States); Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
36 MATERIALS SCIENCE; Electron correlation microscopy; Supercooled liquid; Structural relaxation time; Metallic glass; In-situ heating
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1379165; OSTI ID: 1416195