MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
High-Temperature Thermoelectric Properties of Pr1−xSrxFeO3 (0.1 ≤ x ≤ 0.7)
Hiroshi NakatsugawaMiwa SaitoYoichi Okamoto
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2019 Volume 60 Issue 6 Pages 1051-1060

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Abstract

Polycrystalline specimens of Pr1−xSrxFeO3 (0.1 ≤ x ≤ 0.7) were synthesized using a solid state reaction method. All samples had a typical perovskite structure, where the orthorhombic (Pbnm) phase was dominant at x ≤ 0.5 and the rhombohedral (R-3c) phase was dominant at x ≥ 0.6. Since the B site is in the mixed valence state of Fe3+/Fe4+ and the spin quantum number is in the range of 0.86 ≤ s ≤ 1.15, it is expected that Fe3+ is in the spin state of low spin (LS) Fe3+ or intermediate spin (IS) Fe3+ and Fe4+ is in the spin state of LS Fe4+. As x increases, the ratio of IS Fe3+ decreases compared to that of LS Fe3+ at x ≥ 0.3, so that the P-type Seebeck coefficient is maintained up to x = 0.5. Although ZT = 0.002 (T = 850 K) of x = 0.7 which shows the maximum N-type thermoelectric characteristic is about 8% of ZT = 0.024 (T = 850 K) of x = 0.1 which shows the maximum P-type thermoelectric characteristic, both are the results of relatively high Seebeck coefficient, low electrical resistivity, and low thermal conductivity. Therefore, we strongly suggest that there is a possibility of application of PN elements which compose of the perovskite-type oxides.

 

This Paper was Originally Published in Japanese in J. Thermoelec. Soc. Jpn. 15 (2018) 3–13.

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