Abstract
In order to clarify a dominant factor occupying oxide-ion conductivity, electrical conductivity was measured for the fluorite-type solid–solution systems, (Y 1− x M x ) 3NbO 7 (M=Ca, Mg) and Y 3(Nb 1− x M x ′)O 7 (M′=Zr and Ce) by means of the ac two-probe method. A solubility limit of dopant was around x=0.1 for each system. Activation energy for the electrical conduction was estimated to be 117 kJ/mol for Y 3NbO 7 and decreased to the range 94–404 kJ/mol for the solid–solution samples. The compositional change in the conductivity could be interpreted neither by oxygen vacancy concentration nor by substituted ion radius. Resultantly, it was found that the oxide-ion conduction was strongly dependent on the unit cell free volume in the present study.
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