Thermoelectric properties and their relation to crystal structure of rare earth (RE = La, Nd, Sm and Gd)-doped SrO(SrTiO3)2 Ruddelsden-Popper phase

Y. F. Wang, K. H. Lee, H. Ohta, K. Koumoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

We herein report the significant relaitonship between the thermoelectric properties and the crystallogrphic characteristics, especially the local symmetry of TiO6 octahedra, in the n = 2 Ruddlesden-Popper (RP)-type phases of 5 at.%-rare earth (RE3+ = La3+, Nd3+, Sm3+ and Gd3+)-doped SrO(SrTiO3)2. It was observed that doped RE3+ ions occupied preferentially the Sr-site (CN = 9) in SrO layer, which had a favorable restoration effect on the distorted TiO6 octahedra which was found more effective in smaller-sized RE3+ -doped compounds, as partially proven by the increase in O3-Ti-O3 bond angle with decreasing in ionic radius of RE 3+. The Sm3+ and Gd3+-doped SrO(SrTiO 3)2 exhibited larger Seebeck coefficient (|S|) than those of La3+ and Nd3+-doped SrO(SrTiO3)2 over the whole measured temperature range (300~1000 K). This is considered to be due to the enhancement of the density of states (DOS) in Ti 3d orbitals originated from improved symmetry in TiO6 octahedra by smaller RE3+ doping.

Original languageEnglish
Title of host publicationProceedings ICT'07 - 26th International Conference on Thermoelectrics
Pages157-160
Number of pages4
DOIs
Publication statusPublished - 2007 Dec 1
EventICT'07 - 26th International Conference on Thermoelectrics - Jeju, Korea, Republic of
Duration: 2007 Jun 32007 Jun 7

Publication series

NameInternational Conference on Thermoelectrics, ICT, Proceedings

Other

OtherICT'07 - 26th International Conference on Thermoelectrics
CountryKorea, Republic of
CityJeju
Period07/6/307/6/7

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All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Wang, Y. F., Lee, K. H., Ohta, H., & Koumoto, K. (2007). Thermoelectric properties and their relation to crystal structure of rare earth (RE = La, Nd, Sm and Gd)-doped SrO(SrTiO3)2 Ruddelsden-Popper phase. In Proceedings ICT'07 - 26th International Conference on Thermoelectrics (pp. 157-160). [4569447] (International Conference on Thermoelectrics, ICT, Proceedings). https://doi.org/10.1109/ICT.2007.4569447