Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5440400 | Journal of the European Ceramic Society | 2017 | 6 Pages |
Abstract
Thermal insulation applications have long required materials with low thermal conductivity, and one example is yttria (Y2O3)-stabilized zirconia (ZrO2) (YSZ) as thermal barrier coatings used in gas turbine engines. Although porosity has been a route to the low thermal conductivity of YSZ coatings, nonporous and conformal coating of YSZ thin films with low thermal conductivity may find a great impact on various thermal insulation applications in nanostructured materials and nanoscale devices. Here, we report on measurements of the thermal conductivity of atomic layer deposition-grown, nonporous YSZ thin films of thickness down to 35Â nm using time-domain thermoreflectance. We find that the measured thermal conductivities are 1.35-1.5Â WÂ mâ1Â Kâ1 and do not strongly vary with film thickness. Without any reduction in thermal conductivity associated with porosity, the conductivities we report approach the minimum, amorphous limit, 1.25Â WÂ mâ1Â Kâ1, predicted by the minimum thermal conductivity model.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Jungwan Cho, Joonsuk Park, Jihwan An,