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Title: Microscale Imaging of Thermal Conductivity Suppression at Grain Boundaries

Journal Article · · Advanced Materials
ORCiD logo [1];  [2];  [3];  [4]; ORCiD logo [1];  [5]
  1. Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA
  2. Department of Mechanical Engineering Northwestern University Evanston IL 60208 USA
  3. Department of Chemical and Biomedical Engineering FAMU‐FSU College of Engineering Tallahassee FL 32310 USA
  4. Department of Chemical Engineering and Materials Science Michigan State University East Lansing MI 48824 USA
  5. Department of Mechanical Engineering Northwestern University Evanston IL 60208 USA, Department of Civil and Environmental Engineering Northwestern University Evanston IL 60208 USA

Abstract Grain‐boundary engineering is an effective strategy to tune the thermal conductivity of materials, leading to improved performance in thermoelectric, thermal‐barrier coatings, and thermal management applications. Despite the central importance to thermal transport, a clear understanding of how grain boundaries modulate the microscale heat flow is missing, owing to the scarcity of local investigations. Here, thermal imaging of individual grain boundaries is demonstrated in thermoelectric SnTe via spatially resolved frequency‐domain thermoreflectance. Measurements with microscale resolution reveal local suppressions in thermal conductivity at grain boundaries. Also, the grain‐boundary thermal resistance – extracted by employing a Gibbs excess approach – is found to be correlated with the grain‐boundary misorientation angle. Extracting thermal properties, including thermal boundary resistances, from microscale imaging can provide comprehensive understanding of how microstructure affects heat transport, crucially impacting the materials design of high‐performance thermal‐management and energy‐conversion devices.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NONE; SC0019252
OSTI ID:
1992974
Alternate ID(s):
OSTI ID: 2421060; OSTI ID: 1992975
Journal Information:
Advanced Materials, Journal Name: Advanced Materials Journal Issue: 38 Vol. 35; ISSN 0935-9648
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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