Question: The table below contains conductivity data for two materials. The melting point of PbF 2 is 1103 K. (a) Describe the structure of each material

The table below contains conductivity data for two materials. The melting point of PbF2 is 1103 K.

(a) Describe the structure of each material and the origin of the relatively high conductivities.

(b) Comment on the temperature dependence of conductivities.

(c) For Zr1−xYxO2−x/2, estimate the activation energy for charge-carrier migration. State two possible uses of Zr1−xYxO2−x/2.

T(K) 670 840 1250 PbF0 (S/cm) 0.1 4.6 4.6 Zr-xYxO-x/20 (S/cm) 0.0001 0.002 0.1

T(K) 670 840 1250 PbF0 (S/cm) 0.1 4.6 4.6 Zr-xYxO-x/20 (S/cm) 0.0001 0.002 0.1

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