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Effects of coherent ferroelastic domain walls on the thermal conductivity and Kapitza conductance in bismuth ferrite
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View: Figures


Image of FIG. 1.
FIG. 1.

Ferroelectric domain orientation maps for 4-domain (a) and 2-domain (b) specimens, with corresponding images of domain boundary types and charging in (c) and (d) revealing the substantial difference in domain wall density for distinct polarization variants. The 200 nm scale bars in (a) and (b) apply to all images for each specimen (columns).

Image of FIG. 2.
FIG. 2.

Effective thermal conductivities of the BiFeO3 films (filled symbols). There is a clear dependence of the thermal transport on the number of domains, which we ascribe to additional temperature drops across the nanometer thick domain walls caused by phonon scattering in the localized strain field. For comparison, we also plot the thermal conductivity of bulk SrTiO3 (open squares, Refs. 20 and 30 ) and amorphous SiO2 (solid line, Ref. 31 ).

Image of FIG. 3.
FIG. 3.

Thermal boundary conductance across the domain walls in the BiFeO3 films. For comparison, we also plot the calculated thermal boundary conductance across grain boundaries in YSZ (filled triangles, Ref. 34 ), silicon (filled circles, Ref. 37 ), and SrTiO3 (empty triangles, Ref. 20 ). We also include Si grain boundary thermal boundary conductances determined with molecular dynamics from Refs. 38 and 39 . The thermal boundary conductances across the YSZ, Si, and SrTiO3 grain boundaries are consistently higher than the thermal boundary conductances across the BiFeO3 domain boundaries, even though the grain boundaries are highly disordered regions where the domain walls are completely coherent. We also plot the equivalent conductances of some thickness d of SiO2 (solid lines with d indicated in the plot). The thermal boundary conductance across the BiFeO3 domain boundaries is similar to the equivalent conductance of ∼10 nm of SiO2.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Effects of coherent ferroelastic domain walls on the thermal conductivity and Kapitza conductance in bismuth ferrite