Low Thermal Conductivity of RE-Doped SrO(SrTiO3)1 Ruddlesden Popper Phase Bulk Materials Prepared by Molten Salt Method

Yulia Eka Putri; Suhana Mohd Said; Refinel Refinel; Michitaka Ohtaki; Syukri Syukri

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자료유형: 학술저널

저자정보: Yulia Eka Putri (Andalas University) Suhana Mohd Said (University of Malaya) Refinel Refinel (Andalas University) Michitaka Ohtaki (Kyushu University) Syukri Syukri (Andalas University)

저널정보: 대한금속·재료학회 Electronic Materials Letters Electronic Materials Letters Vol.14 No.5

발행연도: 2018.1

수록면: 556 - 562 (7page)

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The SrO(SrTiO3)1 (Sr2TiO4) Ruddlesden Popper (RP) phase is a natural superlattice comprising of alternately stackingperovskite-type SrTiO3layers and rock salt SrO layers along the crystallographic c direction. This paper discusses theproperties of the Sr2TiO4and (La, Sm)-doped Sr2TiO4RP phase synthesized via molten salt method, within the context ofthermoelectric applications. A good thermoelectric material requires high electrical conductivity, high Seebeck coefficientand low thermal conductivity. All three conditions have the potential to be fulfilled by the Sr2TiO4RP phase, in particular,the superlattice structure allows a higher degree of phonon scattering hence resulting in lowered thermal conductivity. In thiswork, the Sr2TiO4RP phase is doped with Sm and La respectively, which allows injection of charge carriers, modification ofits electronic structure for improvement of the Seebeck coefficient, and most significantly, reduction of thermal conductivity. The particles with submicron size allows excessive phonon scattering along the boundaries, thus reduces the thermalconductivity by fourfold. In particular, the Sm-doped sample exhibited even lower lattice thermal conductivity, which isbelieved to be due to the mismatch in the ionic radius of Sr and Sm. This finding is useful as a strategy to reduce thermalconductivity of Sr2TiO4RP phase materials as thermoelectric candidates, by employing dopants of differing ionic radius.

참고문헌 (29)

참고문헌 신청

Ruddlesden, S.N. / 1958 / The compound Sr 3 Ti 2 O 7 and its structure / Acta Crystallogr 11:54~55

Ruddlesden, S.N. / 1957 / New compounds of the K 2 NIF 4 type / Acta Crystallogr 10:538~539

Zhang, L. / 2016 / First principles studies on the thermoelectric properties of (SrO) m (SrTiO 3 ) n superlattice / RSC Adv 6:102172~102182

Haeni, J.H. / 2001 / Epitaxial growth of the fi rst fi ve members of the Sr n+1 Ti n O 3n+1 Ruddlesden–Popper homologous series / Appl. Phys. Lett 78:3292~3294

Tsai, H. / 2016 / High-efficiency two-dimensional Ruddlesden-Popper perovskite solar cells / Nature 536:312~316

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