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Voltage-Controlled Bistable Thermal Conductivity in Suspended Ferroelectric Thin-Film Membranes

Journal Article · · ACS Applied Materials and Interfaces
 [1];  [2];  [3];  [4];  [4];  [5];  [5];  [6];  [3];  [7]
  1. Univ. of Virginia, Charlottesville, VA (United States); The Pennsylvania State Univ., University Park, PA (United States)
  2. The Pennsylvania State Univ., University Park, PA (United States); General Electric, Niskayuna, NY (United States)
  3. Univ. of Virginia, Charlottesville, VA (United States)
  4. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  5. Argonne National Lab. (ANL), Lemont, IL (United States)
  6. The Pennsylvania State Univ., University Park, PA (United States)
  7. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Univ. of Virginia, Charlottesville, VA (United States)
Ferroelastic domain walls in ferroelectric materials possess two properties that are known to affect phonon transport: a change in crystallographic orientation and a lattice strain. Changing populations and spacing of nanoscale-spaced ferroelastic domain walls lead to the manipulation of phonon-scattering rates, enabling the control of thermal conduction at ambient temperatures. In the present work, lead zirconate titanate (PZT) thin-film membrane structures were fabricated to reduce mechanical clamping to the substrate and enable a subsequent increase in the ferroelastic domain wall mobility. Under application of an electric field, the thermal conductivity of PZT increases abruptly at ~100 kV/cm by ~13% owing to a reduction in the number of phonon-scattering domain walls in the thermal conduction path. The thermal conductivity modulation is rapid, repeatable, and discrete, resulting in a bistable state or a “digital” modulation scheme. The modulation of thermal conductivity due to changes in domain wall configuration is supported by polarization-field, mechanical stiffness, and in situ microdiffraction experiments. In conclusion, this work opens a path toward a new means to control phonons and phonon-mediated energy in a digital manner at room temperature using only an electric field.
Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
Air Force Research Laboratory (AFRL), Air Force Office of Scientific Research (AFOSR); National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357; AC04-94AL85000
OSTI ID:
1465382
Alternate ID(s):
OSTI ID: 1481749
Report Number(s):
SAND--2018-8415J; 666627
Journal Information:
ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 30 Vol. 10; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Thermal conductivity in self-assembled CoFe 2 O 4 /BiFeO 3 vertical nanocomposite films journal November 2018

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