ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The a.c. conductivity of high purity ceria has been measured at oxygen pressures and temperatures in the ranges 0.01 to 400 atm and 700 to 1100° C respectively. Similar measurements have been made on impure ceria over the same temperature range for oxygen pressures up to 100 atm. The conductivity isotherms obtained exhibit flattish minima where the ionic contribution to the conductivity is a maximum, a region at low oxygen pressures, where n-type conduction occurs and increases with diminishing pressure, and a high pressure region where p-type conduction occurs and increases with pressure. Activation energies derived for the conductivity minima are 1.55 and 0.85 eV for the high purity and impure ceria respectively; the higher value for the high purity material implies that a significant electronic contribution is present.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00566271
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