Preparation and improved electrical performance of the Pr-doped CaMnO3−δ thermoelectric compound
Year: 2013
Type: article
Abstract: The rare earth Pr-doped Ca 1− x Pr x MnO 3 − δ (0 ⩽ x ⩽ 0.14) compound bulk samples are fabricated by citrate acid sol–gel combined with the ceramic preparation method. The effects of Pr doping on the structural and electrical transport properties of CaMnO 3− δ within the high-temperature region are investigated in detail. The results show that single orthorhombic compounds can be formed in the experimental doping region. The remarkably reduced electrical resistivity is observed for the doped samples with the minimum value 3.90 mΩ cm at 373 K for the x = 0.14 sample; the absolute value of the Seebeck coefficient is decreased due to electron carrier concentration enhancement. The electrical properties of the doped samples are optimized compared with that of the parent sample, and the x = 0.08 sample is found to have the largest power factor value of 0.334 mW m −1 K −2 at 873 K. It is confirmed from the investigation that the electrical performance could be improved remarkably by rare earth Pr doping at a lower content.
Source: Physica Scripta
Authors: F P Zhang, Q M Lu, X Zhang, J X Zhang
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2016562795