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Low-temperature Thermoelectric Properties of the Electron-doped Perovskites Sr1−xCaxTi1−yNbyO3
Tetsuji Okuda,Junichi Fukuyado,Kurahito Narikiyo,Mitsuru Akaki,Hideki Kuwahara 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We have investigated the thermoelectric (TE) properties for single crystals of the perovskitesSr1−xCaxTi1−yNbyO3 for 0 ≤ x ≤ 0.4 and 0 ≤ y ≤ 0.03 at temperatures below room temperature(RT). We found that SrTi0.99Nb0.01O3 showed a large power factor at low temperatures (PF =50 µW/K2cm at 100 K 90 µW/K2cm at 50 K) and the largest dimensionless TE figure-ofmeritat temperatures below 40 K (ZT 0.07) among the reported materials. Such a large lowtemperatureTE response around a carrier concentration of 1020 cm−3 is due to a distinct phonondrag effect. We also found that the Ca2+ substitution for Sr2+ increased the ZT at 300 K forSr1−xCaxTi0.97Nb0.03O3 from 0.08 to 0.105. The enhancement of the ZT around RT originatesboth from a large reduction of a thermal conductivity due to a randomness introduced into thecrystal structure and from an unexpected enhancement of a Seebeck coefficient.