Lanthanum substituted CeNbO4+δ scheelites: mixed conductivity and structure at elevated temperatures
Abstract
CeNbO4+δ is a room temperature monoclinic material exhibiting a phase change to a tetragonal scheelite polymorph at 1023 K. The material can accommodate oxygen excess up to a composition of CeNbO4.25 in air which is believed to be incorporated on interstitial sites and hence is of interest for solid