Transport Properties of La
- 15 April 1966
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 144 (2), 593-604
- https://doi.org/10.1103/physrev.144.593
Abstract
We report measurements of the lattice and bulk thermal expansion, fluorine nuclear magnetic resonance, and electrical conductivity of single-crystal La in the temperature range 300-1000°K. In the lower portion of this temperature range, the measurements yield activation energies for the formation of Schottky defects of ∼0.07 eV and for fluorine ion diffusion of ∼0.45 eV. The activation energy for diffusion appears to decrease at higher temperatures. We propose a model for the crystal with low activation energy for the formation of neutral defects, and a higher energy for defect dissociation and diffusion. The apparent changes of activation energy are ascribed to the excitation of lattice vibrations near the Debye temperature.
Keywords
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