Oxygen self-diffusion in cerium oxide doped with Nd

摘要

Polycrystalline Ce_0.77Nd_0.23O_1.885 having a relative density in excess of 98/100 was prepared. Oxygen diffusion experiments were performed for the temperature range from 750 to 1100deg.C in an oxygen partial pressure of 6.6 kPa. The concentration profile of 18~O in the specimens following diffusion annealing was measured by secondary ion mass spectroscopy (SIMS). The oxygen self-diffusion coefficient obtained using secondary ion mass spectrometry was expressed by D=6.31×10~-9 exp(-53 kJ mol~-1/RT) m~2 S~-1 and was in the extrinsic region.