期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 731, 期 -, 页码 723-730出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.10.033
关键词
Perovskite; Thermoelectric; Inclusions; Oxide; Grain boundary
资金
- EPSRC [EP/H043462, EP/I036230/1, EP/L014068/1, EP/L017695/1]
- University of Manchester
- Engineering and Physical Sciences Research Council [EP/L017695/1, EP/I036230/1, EP/L014068/1, EP/M50774X/1, EP/J000620/1, EP/I03601X/1, EP/H043462/1] Funding Source: researchfish
- EPSRC [EP/J000620/1, EP/H043462/1, EP/I03601X/1, EP/M50774X/1] Funding Source: UKRI
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.
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