Enhancement of Seebeck coefficient for SrO (SrTi O3) 2 by Sm substitution: Crystal symmetry restoration of distorted Ti O6 octahedra

Yifeng Wang, Kyu Hyoung Lee, Hideki Hyuga, Hideki Kita, Katsuhiko Inaba, Hiromichi Ohta, Kunihito Koumoto

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13 Citations (Scopus)

Abstract

We found that Sm3+ substitution in SrO (SrTi O3) 2 is effective in improving the Seebeck coefficient (S). The ∫S∫ value increases notably with temperature, benefiting from an enhancement of the density of states (DOS) effective mass md* from ∼3 m0 (300 K) to ∼7.5 m0 (1000 K), due to an improvement of the local symmetry of Ti O6 octahedra, enhancing the degeneracy in the Ti 3d orbitals, which form the conduction band (CB), and also to an accompanying lattice expansion, which gives rise to a higher DOS at the bottom of the CB and, consequently, a larger md*.

Original languageEnglish
Article number242102
JournalApplied Physics Letters
Volume91
Issue number24
DOIs
Publication statusPublished - 2007

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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