Abstract Both CaZr0·9In0·1O3-α ceramics and ceramic nano-powders are synthesized starting from a co-precipate formed using a wet-chemical co-precipitation method. The XRD-results confirm that CaZrO3 and CaIn2O4 phases exist after the co-precipitates are calcined at 1273 K for 3 h in air. The CaIn2O4 phase disappears after calcining the powder twice at 1823 K for 10 h in air with the formation of the CaZr0·9In0·1O3-α phase. The XRD pattern of the ceramic powders is the same as that of sintered CaZr0·9In0·1O3-α ceramics (1823 K for 10 h in air). Scanning electron microscopy shows that the ceramic powders calcined at 1273 K for 3 h are nano-sized powders. After sintering at 1823 K for 10 h, the grain-size increases dramatically. EDX results indicate that the Ca:Zr: In ratio in the co-precipitates is close to the theoretical value. The ratio of Ca:In decreases with increasing calcining or sintering temperature. ©