TY - JOUR
T1 - Enhancement of Seebeck coefficient for SrO (SrTi O3) 2 by Sm substitution
T2 - Crystal symmetry restoration of distorted Ti O6 octahedra
AU - Wang, Yifeng
AU - Lee, Kyu Hyoung
AU - Hyuga, Hideki
AU - Kita, Hideki
AU - Inaba, Katsuhiko
AU - Ohta, Hiromichi
AU - Koumoto, Kunihito
PY - 2007
Y1 - 2007
N2 - 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*.
AB - 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*.
UR - http://www.scopus.com/inward/record.url?scp=37149025652&partnerID=8YFLogxK
U2 - 10.1063/1.2820447
DO - 10.1063/1.2820447
M3 - 文章
AN - SCOPUS:37149025652
SN - 0003-6951
VL - 91
JO - Applied Physics Letters
JF - Applied Physics Letters
IS - 24
M1 - 242102
ER -