Solid solubility, raman spectra and electrical property of the solid solutions Ce1-xNdxO2-delta by sol-gel route

Ce1-x NdxO2-delta(x = 0.05-0.55) solid solutions prepared by sol-gel route were crystallized in a cubic fluorite structure. The solid limit was determ ined to be as high as x = 0.45. Raman spectra of the solid solutions with l ower composition exhibited only one band, which was assigned to F-2g mode. Increasing composition produced broad and asymmetric F-2g mode with an appe arance of low frequency tail. The new broad peak observed at higher frequen cy side of the F-2g mode associated with the oxygen vacancy in the lattice. The impedance spectra of the solid solutions showed definitely ionic condu ction, and Ce0.80Nd0.20O2-delta solid solution possessed a maximum conducti vity. At 500 degreesC, the conductivity and activation energy were 2.65 x 1 0(-3)S/cm and 0.82 eV, respectively.