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High-temperature electronic transport properties of Fe-doped YBaCo2O5+δ

✍ Scribed by Xiantu Zhang; Haoshan Hao; Qinglin He; Xing Hu

Publisher
Elsevier Science
Year
2007
Tongue
English
Weight
294 KB
Volume
394
Category
Article
ISSN
0921-4526

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✦ Synopsis

The resistivity and Seebeck coefficients of YBaCo 2Àx Fe x O 5+d (0pxp0.8) were measured from room temperature (RT) to 800 1C. It was found that all compositions behave as p-type semiconductors in the temperature range of RT-300 1C. When temperature is above about 300 1C, both electrical resistivity and Seebeck coefficients increase with the increase of temperature due to oxygen desorption from the lattices. Fe doping tends to increase resistivity and Seebeck coefficients in all the temperature ranges measured. The calculated activation energy of conductivity is larger than that of thermopower in the semiconductor region, which means that the conduction mechanism may be determined as a small polaron hopping model.

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