Enhanced Electronic Conductivity in Si-Substituted Calcium Aluminate

Julia E. Medvedeva, Missouri University of Science and Technology
Thomas O. Mason
Kenneth R. Poeppelmeier
Mariana I. Bertoni
Arthur J. Freeman

This document has been relocated to http://scholarsmine.mst.edu/phys_facwork/281

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Improved conductivity has been achieved by controllable substitution of an ultraviolet electronic conductor. The transparent conducting oxide system, H-doped Ca12Al(14−x)SixO(33+x/2) with x=0−4, exhibits a conductivity strongly dependent on the substitution level. Four-point direct current conductivity increases with x from 0.15 to 0.61 S/cm at room temperature. The observed conductivity behavior is consistent with the predictions of our first principles density functional calculations for the Si-substituted system with x=0, 2, and 4. Furthermore, the Seebeck coefficient is composition dependent suggesting the existence of an activated mobility associated with small polaron conduction. ©2007 American Institute of Physics