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Fig. 1. Effect of MgO concentration on unit cell dimensions.

UFeO, —»—UFeO_.12.5NjO —UFeO,-9HsO -*-Ni0-5U,0 —LlCoO,

UFeO, —»—UFeO_.12.5NjO —UFeO,-9HsO -*-Ni0-5U,0 —LlCoO,

Fig. 3. Grain-size-compensated deformation rate vi density-compensated stress.

Fig. 3. Grain-size-compensated deformation rate vi density-compensated stress.

a lot) 200 300 «» Cuntnt Density. mA/cm 2 Fig. 5. Changes in polarization curves vs time of MCFC test cell containing Material 1 cathode.

%MgO

Fig. 2. Effect of MgO concentration on resistivity of LiFeOj at 650°C in air.

Timc.h

Fig. 4. Cell potential us time of MCFC test cell containing Material 1 cathode.

Timc.h

Fig. 4. Cell potential us time of MCFC test cell containing Material 1 cathode.

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