Theory of thermal conduction in thin ceramic films

The theory of heat conduction in ceramics by phonons! and at high temperature es also by infrared radiation, is reviewed. The phonon mean ii-re path is limited by three-phonon interactions and by scattering of various imperfections. Point defects scatter high-frequency phonons: extended imperfections, such as inclusions, pores, and grain boundaries, affect mainly low-frequency phonons. Thermal radiation is also scattered by imperfections. but of a larger size, such as splat boundaries and large ports. Porosity also reduces the effective index of refraction. For films there are also external boundaries, cracks, and splat boundaries, depending on the mettled of deposition. Examples discussed are cubic zirconia, titanium oxide, and uranium oxide. Graphite and graphene sheets, with two-dimensional phonon gas, ale discussed briefly.