Colossal magnetoresistance Electric conductivity High temperature effects Sampling Seebeck effect X ray diffraction analysis Ca1-xPrxMnO2.98 perovskite Temperature interval Thermoelectric properties Thermopower theory Calcium compounds
Issue Date:
2004
Publisher:
Physica B: Condensed Matter
Citation:
Volume 352, Issue 4-Jan, Page 18-23
Abstract:
Ca1-xPrxMnO3-?? (x=0, 0.05, 0.15, 0.1, 0.2, 0.4, 0.67; ??=0.02) samples were prepared by a
solid-state reaction method. X-ray diffraction analysis showed that all samples prepared were of single phase
with orthorhombic structure. Electrical resistivity measurements from room temperature to 1300K showed
that a metallic conducting tendency dominated at high temperatures. The hopping nature of the charge
carriers was well interpreted in the framework of polaron theory. The Seebeck coefficient was measured in
the same temperature interval, and its concentration dependence was analyzed using the high-temperature
(HT) thermopower theory proposed by Marsh-Parris. The thermal conductivity and the figure of merit of the
prepared samples were also compared with those of other similar perovskite compounds. The observed
figure of merit of the sample with x=0.15 was Z=1.5??10-4K-1 at T=1100K, indicating a good potential for
application as a HT thermoelectric material. ?? 2004 Elsevier B.V. All rights reserved.
