فهرست نشریات علمی دسترسی آزاد ایران

Lanthanum (La) doped Ceria (CeO 2 ) has attracted considerable interest as a candidate material for thermal barrier coating (TBC) because of its low thermal conductivity and potential capability to be operated above 1250 ° C. In this study, La 2 Ce 2 O 7 powder was synthesized through the ball mill method. The crystal structure of La 3+ substituted CeO 2 solid solution was investigated by X-ray diffraction in La x Ce 1-x O 2-x/2 (0<x< 0.5). The fluorite structure of CeO 2 did not change although La 3+ was the largest trivalent rare-earth ion. The lattice parameter changed from 5.41 to 5.59Å by increasing La content. Changes in the lattice parameters of La x Ce 1-x O 2-x/2 that were compared with the theoretical values measured by XRD were obtained based on the oxygen vacancy model. The theoretical lattice parameters were larger than the lattice parameters calculated from the X-ray diffraction pattern. Moreover, the Williamson–Hall equation was used to measure the crystallite size and strain in the La x Ce 1-x O 2-x/2 lattice as a function of the lanthanum content. The results showed that the presence of lanthanum in the structure reduced the crystallite size.