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Solid Solubility, Raman Spectra and Electrical Property of the Solid Solutions Ce 1‐x Nd x O 2‐δ by Sol‐gel Route
Author(s) -
Lin XiaoMin,
Li LiPing,
Li GuangShe,
Su WenHui
Publication year - 2001
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20010190610
Subject(s) - chemistry , solid solution , raman spectroscopy , ionic conductivity , fast ion conductor , vacancy defect , analytical chemistry (journal) , conductivity , solubility , ionic bonding , fluorite , spectral line , crystallography , ion , electrode , chromatography , physics , organic chemistry , astronomy , optics , electrolyte
Ce 1‐x Nd x O 2‐δ ( x = 0.05–0.55) solid solutions prepared by sol‐gel route were crystallized in a cubic fluorite structure. The solid limit was determined to be as high as x = 0.45. Raman spectra of the solid solutions with lower composition exhibited only one band, which was assigned to F 2g mode. Increasing composition produced broad and asymmetric F 2g mode with an appearance of low frequency tail. The new broad peak observed at higher frequency side of the F 2g mode associated with the oxygen vacancy in the lattice. The impedance spectra of the solid solutions showed definitely ionic conduction, and Ce 0.80 Nd 0.20 O 2‐δ solid solution possessed a maximum conductivity. At 500 °C, the conductivity and activation energy were 2.65 × 10 −3 S/cm and 0.82 eV, respectively.