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Materials 2017, 10(2), 146; doi:10.3390/ma10020146

Long-Term High-Temperature Stability of Directionally Grown [Bi2Ba2O4]p[CoO2] Rods

Instituto de Ciencia de Materiales de Aragón (CSIC-Universidad de Zaragoza), C/María de Luna 3, 50018 Zaragoza, Spain
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Received: 28 November 2016 / Revised: 18 January 2017 / Accepted: 26 January 2017 / Published: 8 February 2017
(This article belongs to the Special Issue Advances in Thermoelectric Materials)
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Abstract

[Bi2Ba2O4]p[CoO2] thermoelectric ceramics have been successfully grown from the melt using the laser floating zone method, followed by a thermal treatment at 700 °C under air between 0 and 1532 h. The microstructural, thermoelectric, and mechanical properties were evaluated as a function of the thermal treatment length. Microstructure has shown that as-grown samples are composed of thermoelectric grains, together with a relatively high amount of secondary phases. Thermal treatment decreased the number and amount of secondary phases, producing nearly single-phase samples after 384 h. Consequently, the thermoelectric properties evaluated through the power factor showed a slight increase with the thermal treatment length, mainly due to the decrease of electrical resistivity, while the Seebeck coefficient was nearly unchanged. On the other hand, flexural strength was practically constant after 24 h thermal treatment. View Full-Text
Keywords: thermoelectricity; cobalt oxide; aging; flexural strength; power factor thermoelectricity; cobalt oxide; aging; flexural strength; power factor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Diez, J.C.; Madre, M.A.; Torres, M.A.; Rasekh, S.; Sotelo, A. Long-Term High-Temperature Stability of Directionally Grown [Bi2Ba2O4]p[CoO2] Rods. Materials 2017, 10, 146.

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