期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 829, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.154466
关键词
Oxide thermoelectric materials; Laser floating zone processing; Calcium manganite; Seebeck coefficient; Thermoelectric performance
资金
- FCT, Portugal within CICECO-Aveiro Institute of Materials [UIDB/50011/2020, UIDP/50011/2020]
- FCT, Portugal - COMPETE 2020 Program [POCI-01-0145-FEDER-031875]
- FCT/MEC
- FEDER under the PT2020 Partnership Agreement
- national funds (OE), through FCT e Fundacao para a Ciencia e a Tecnologia, I.P.
- FCT, Portugal within i3N [UIDB/50025/2020, UIDP/50025/2020]
In this work, the laser floating zone technique (LFZ) for donor-substituted calcium manganite-based thermoelectrics were assessed using Ca1-xPrxMnO3 (x = 0.03, 0.06, 0.1) as a model system. Fibres were grown by LFZ with pulling rates of 25, 100 and 200 mm h(-1) in various atmospheres (air, vacuum and argon). Strongly non-equilibrium conditions imposed by LFZ promoted the formation of impurities in (Ca, Pr)MnO3 ceramic fibres, in several cases possessing dendritic structures. The results clearly indicate that careful optimization of the laser processing conditions is needed to produce the manganites with reasonable thermoelectric performance. Negative effects of the phase impurities, promoted by LFZ, on the transport properties can be minimized by additional heat treatment of the laser-processed fibres. The guidelines suggest that LFZ is a suitable technique for processing of thermoelectric perovskite-type manganites if optimized control over growth parameters and re-equilibration conditions is imposed. (C) 2020 Elsevier B.V. All rights reserved.
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