Lowering the thermal conductivity of Sr(Ti0.8Nb0.2)O3 by SrO and CaO doping: microstructure and thermoelectric properties

被引：3
作者：
Jeric, Marja [1 ,2 ]
de Boor, Johannes [3 ]
Zavasnik, Janez [4 ]
Ceh, Miran [1 ,4 ]
机构：
[1] Jozef Stefan Inst, Dept Nanostruct Mat, Jamova Cesta 39, Ljubljana 1000, Slovenia
[2] Jozef Stefan Postgrad Sch, Jamova 39, Ljubljana 1000, Slovenia
[3] German Aerosp Ctr, Inst Mat Res, D-51147 Cologne, Germany
[4] Ctr Electron Microscopy & Anal, Jamova 39, Ljubljana 1000, Slovenia
来源：
JOURNAL OF MATERIALS SCIENCE | 2016年 / 51卷 / 16期
关键词：
NB-DOPED SRTIO3; SEEBECK COEFFICIENT; PLANAR FAULTS; PERFORMANCE;
D O I：
10.1007/s10853-016-0048-8
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Excess SrO and CaO were added to the Sr(Ti0.8Nb0.2)O-3 thermoelectric material, which was structurally compensated by the formation of Ruddlesden-Poppertype planar faults with the compositions SrO and/or (Sr,Ca)O. Both types of doping significantly changed the original isotropic Sr(Ti0.8Nb0.2)O-3 microstructure and resulted in the formation of lamellar Ruddlesden-Popper-type phases within the Sr(Ti0.8Nb0.2)O-3 grains. Three-dimensional networks of single Ruddlesden-Popper-type faults were also observed in the Sr(Ti0.8Nb0.2)O-3 for both types of doping. The combination of both structural features significantly lowered the thermal conductivity in comparison with Sr(Ti0.8Nb0.2)O-3 due to the enhanced phonon scattering observed at the planar faults, which proves that introducing such defects is a promising method for lowering the thermal conductivity of the Sr(Ti0.8Nb0.2)O-3 thermoelectric material. The highest figure of merit (ZT = 0.08) was achieved with CaO doping, since the significantly reduced thermal conductivity was accompanied by an increased power factor.
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收藏
页码：7660 / 7668
页数：9
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