Improving the thermoelectric properties of SrTiO3-based ceramics with metallic inclusions

JOURNAL OF ALLOYS AND COMPOUNDS

卷:731

Article

Srivastava, Deepanshu¹  Norman, Colin¹  Azough, Feridoon¹  Schafer, Marion C.²  Guilmeau, Emmanuel²  Freer, Robert¹ 

[1] Univ Manchester, Sch Mat, Manchester M13 9PL, Lancs, England

[2] CNRS, Lab CRISMAT, UMR 6508, ENSICAEN, 6 Bld Marechal Juin, F-14050 Caen, France

关键词: Perovskite;    Thermoelectric;    Inclusions;    Oxide;    Grain boundary;   

DOI  :  10.1016/j.jallcom.2017.10.033

来源: Elsevier

【 摘 要 】

High quality Sr0.8La0.067Ti0.8Nb0.2O3-delta ceramics containing inclusions of Cu or Fe were prepared by the mixed oxide route and sintered under reducing conditions at 1700 K. Products were high density; Fe enhanced density (to 98% theoretical) and grain size (to 15 mm) whilst Cu tended to reduce both slightly. XRD and SEM analyses showed that the material is mainly composed of cubic SrTiO3 phase, with rutile-structured minor phases and metallic inclusions along the grain boundaries. The inclusions increased carrier concentration and carrier mobility, leading to a reduction in electrical resistivity by a factor of 5 and increase in power factor by 75%. Both types of metallic inclusions were beneficial, increasing the thermoelectric figure of merit (ZT) from 0.25 at 1000 K for the control sample, to ZT of 0.36 at 900 K for the Cu-containing samples and to 0.38 at 1000 K for the Fe-containing samples. (C) 2017 The Authors. Published by Elsevier B.V.

【 授权许可】

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