Characterization of Kapitza resistances of natural grain boundaries in cerium oxide

In this study, the Kapitza resistances of natural grain boundaries of Cerium Oxide (CeO2) at room temperature was experimentally determined and correlated with the grain misorientation. A spatial-domain thermoreflectance technique (SDTR) was used as the characterization tool and the Kapitza resistances of the target grain boundaries were obtained from solving the inverse heat conduction problem through a multi-parameter fitting process. The measurements were performed at , similar to 70 different grain boundaries with the size of adjacent grains larger than approximately 100 mu m From more than 50 sets of effective data, the average interfacial thermal resistance is measured as (8.95 +/- 0.68) x 10(-9) m(2)K/W, which is consistent with results from other studies. The grain orientations from five selected locations with good data quality were characterized by electron backscatter diffraction (EBSD). A direct correlation between Kapitza resistances and misorientation angles of high-angle grain boundaries was found.