(a) At 670 K, CaF 2 (mp=1691 K) doped with 1% NaF has an electrical conductivity of...
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(a) At 670 K, CaF2 (mp=1691 K) doped with 1% NaF has an electrical conductivity of 0.1Ω−1 m−1. Suggest how this conductivity arises.
(b) The value of Tc for YBa2Cu3O7 is 93 K. Sketch the change in electrical resistivity as a function of temperature as YBa2Cu3O7 is cooled from 300 to 80 K. How does the shape of this graph differ from those that describe the change in resistivity with temperature for a typical metal and a typical semiconductor?
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a The increased electrical conductivity of CaF2 doped with 1 NaF at 670 K can be explained through the concept of ionic conductivity CaF2 is an ionic compound with a crystal lattice structure consisti...View the full answer
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