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Defect structure, ionic conductivity, and diffusion in yttria-stabilized zirconia and related oxide electrolytes with fluorite structure

Technical Report ·
OSTI ID:7006945
;
Ionic conductivity data of yttria-stabilized zirconia, Y/sub 4/xZr/sub 1-4/xO/sub 2-2x/, reported in the literature as functions of oxygen vacancy concentration, x, and temperature, T, were analyzed according to a theoretical model developed in a previous paper and applied to calcia stabilized zirconia. Because of the different charge-compensation mechanism in yttria stabilized zirconia, Y/sub 4/xZr/sub 1-4/xO/sub 2-2x/, than that in calcia-stabilized zirconia, Ca/sub 2x/Zr/sub 1-2x/O/sub 2-2x/, the theory predicts the occurrence of a maximum of ionic conductivity at an oxygen vacancy concentration, which is just half the oxygen vacancy concentration at the maximum, x = 0.0625 (= 1/16), in calcia-stabilized zirconia. Results of the theoretical analysis on yttria-stabilized zirconia obtained herein are compared with those on calcia-stabilized zirconia obtained in Paper 1 and are also discussed in relation to the ionic conductivity data of the various rare earth oxide-stabilized zirconia systems. The basic assumptions and limitations of the theoretical model are critically examined, and possible modifications of the theoretical model are suggested.
Research Organization:
Arizona State Univ., Tempe (USA)
OSTI ID:
7006945
Report Number(s):
AD-A-172642/1/XAB
Country of Publication:
United States
Language:
English

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