Large Thermoelectric Response of Ti-Containing Perovskite Oxides


Article Preview

Nb-content dependence of the thermoelectric figure of merit, ZT of SrTiO3 at high-temperature (1000 K) is clarified using heavily Nb-doped SrTiO3 epitaxial films, which were grown on (100)-face of LaAlO3 single crystal substrates by a pulsed-laser deposition. Carrier concentration, Hall mobility, Seebeck coefficient, and thermal conductivity of Nb-doped SrTiO3 epitaxial films were experimentally evaluated at 1000 K with an aid of theoretical analysis. ZT reached 0.37 (20%-Nb-doped SrTiO3 epitaxial film) at 1000 K, which is the largest value among n-type oxide semiconductors ever reported.



Key Engineering Materials (Volumes 336-338)

Edited by:

Wei Pan and Jianghong Gong




H. Ohta et al., "Large Thermoelectric Response of Ti-Containing Perovskite Oxides", Key Engineering Materials, Vols. 336-338, pp. 809-813, 2007

Online since:

April 2007




[1] B.A. Cook, J.L. Harringa, S.H. Hann and C.B. Vining: J. Appl. Phys. Vol. 78 (1995), p.5474.

[2] I. Nishida: Phys. Rev. B Vol. 7 (1973), p.2710.

[3] I. Terasaki, Y. Sasago and K. Uchinokura: Phys. Rev. B Vol. 56 (1997), p.12685.

[4] R. Funahashi, I. Matsubara, H. Ikuta, et al.: Jpn. J. Appl. Phys. Vol. 39 (2000), pp. L1127.

[5] R. Funahashi and M. Shikano: Appl. Phys. Lett. Vol. 81 (2002), p.1459.

[6] G. Chen, M. S. Dresselhaus, G. Dresselhaus, et al.; Inter. mater. Rev. Vol. 48 (2003), p.45.

[7] M. Ohtaki, T. Tsubota, K. Eguchi and H Arai: J. Appl. Phys. Vol. 79 (1996), p.1816.

[8] H. Ohta, W-S. Seo and K. Koumoto: J. Am. Ceram. Soc. Vol. 79 (1996), p.2193.

[9] S. Isobe, T. Tani, Y. Masuda, et al.: Jpn. J. Appl. Phys. Vol. 41 (2002), p.731.

[10] T. Caillat, A. Borshchevsky and J. P. Fleurial: J. Appl. Phys. Vol. 80 (1996), p.4442.

[11] H. P. R. Frederikse, W. R. Thurber and W. R. Hosler: Phys. Rev. Vol. 134 (1964), pp. A442.

[12] T. Okuda, K. Nakanishi, S. Miyasaka and Y. Tokura: Phys. Rev. B Vol. 63 (2001), p.113104.

[13] F. J. DiSalvo: Science Vol. 285 (1999), p.703.

[14] S. Ohta, T. Nomura, H. Ohta and K. Koumoto: J. Appl. Phys. Vol. 97 (2005), p.34106.

[15] R. D. Shannon: Acta Cryst. A Vol. 32 (1976), p.751.

[16] C. B. Vining: J. Appl. Phys. Vol. 69 (1991), p.331.

[17] K. Durczewski and M. Ausloos: Phys. Rev. B Vol. 61 (2000), p.5303.

[18] Highly dense (98%) 20%-Nb-doped SrTiO3 ceramic samples were fabricated by conventional hot pressing (36 MPa) of single-phase 20%-Nb-doped SrTiO3 powder, which was prepared by solid-state reaction of SrCO3, TiO2 and Nb2O5 powders at 1400 o C in an Ar atmosphere.