La3Ce7Ta2O23.5 and Nd3Ce7Ta2O23.5 ceramics were obtained adopting a solid-state fritting method from La2O3, Nd2O3, Ta2O5 and CeO2 as original materials. The lattice compositions, microstructures, and thermophysical performances were investigated. The analytical results indicate that the obtained bulk samples are approximately composed of 2LnTa0.5Ce2.5O8.25 and LnTaCe2O7 (Ln = Nd and La), which also show relatively dense microstructures with uneven grain-size distributions. Owing to the higher ionic-radius of La3+ than that of Nd3+, the La3Ce7Ta...
