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Effect of Nd 2 O 3 Concentration on the Defect Structure of CeO 2 –Nd 2 O 3 Solid Solution
Author(s) -
Ikuma Yasuro,
Shimada Eriko,
Okamura Nobuko
Publication year - 2005
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00076.x
Subject(s) - solid solution , fluorite , coprecipitation , aqueous solution , materials science , crystal structure , vacancy defect , analytical chemistry (journal) , ion , rare earth , solubility , crystallography , chemistry , inorganic chemistry , metallurgy , organic chemistry , chromatography
An extensive X‐ray study of CeO 2 –Nd 2 O 3 solid solutions was performed, and the densities of solid solutions containing various concentrations of NdO 1.5 were measured using several techniques. Solid solutions containing 0–80 mol% NdO 1.5 were synthesized by coprecipitation from Ce(NO 3 ) 3 and Nd(NO 3 ) 3 aqueous solutions, and the coprecipitated samples were sintered at 1400°C. A fluorite structure was observed for CeO 2 –NdO 1.5 solid solutions with 0–40 mol% NdO 1.5 , which changed to a rare earth C‐type structure at 45–75 mol% NdO 1.5 . The change in the lattice parameters of CeO 2 –NdO 1.5 solid solutions, when plotted with respect to the NdO 1.5 concentration, showed that the lattice parameters followed Vegard's law in both the fluorite and rare earth C‐type regions. The maximum solubility limit for NdO 1.5 in CeO 2 solid solution was approximately 75 mol%. The relationship between the density and the Nd concentration indicated that the defect structure followed the anion vacancy model over the entire range (0–70 mol% NdO 1.5 ) of solid solution.