Journal
SOLID STATE SCIENCES
Volume 4, Issue 11-12, Pages 1413-1418Publisher
EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/S1293-2558(02)00030-4
Keywords
cuspidine-like phases; oxide ion electrolytes
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The Nd-4[Ga2(1-x)M(2x)O(7+x)square(1-x)]O-2 (M =Ti, Ge) compounds have been prepared by solid state reaction. Nd-4(Ga(2)O(7)square)O-2 and Nd-4(Ti2O8)O-2 both exhibit a cuspidine-like structure and they form a complete solid solution. Upon substituting Ge for Ga, the cuspidine structure is maintained up to x = 0.3. Although both Ti and Ge substitutions for Ga induce a concomitant filling of oxygen vacancies, opposite effects are observed on the oxide ion conductivity: Ti plays a detrimental role whereas the Ge improves the conductivity. A possible interpretation is that additional oxygen atoms are trapped in the coordination polyhedron of Ti4+ whereas they are forced to increase the coordination number of Ga3+ when Ge4+ is introduced in the structure. The highest conductivity at 800 degreesC, sigma approximate to 0.5 x 10(-3) S/cm, is obtained for Nd-4[Ga(1.8)Ge(0.2)O(7.1)square(0.9)]O-2. (C) 2002 Editions scientifiques et medicales Elsevier SAS. All rights reserved.
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