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Effects of Ti substitution on thermoelectric properties of Bi2Sr2Co1.8Oy ceramic textured by Laser Floating Zone (LFZ) technique

AuthorsÖzçelik, B.; Gürsul, M.; Torres, M. A. ; Sotelo, A.; Madre, M. A.
Issue Date2017
AbstractIn this study, Bi2Sr2Co1.8-xTixOy thermoelectric materials with x= 0.0, 0.05, 0.10, and 0.15 have been produced through the classical solid-state reaction and textured using the laser floating zone technique (LFZ). The physical properties of the system have been studied by using SEM, resistivity and Seebeck coefficient measurements. Micrographs with backscattered electrons have shown that the samples have multiphase namely, thermoelectric phase of Bi2Sr2Co1.8Oy, Bi poor phase of Sr2Co2.8-xBixOy, CoO and Bi2Sr2CoOx phase. With increasing Ti-content, amount of Sr2Co2.8-xBixOy phase decreases and a phase of Ti-rich is evolved. From the resistivity measurement, all as-grown samples exhibit a semiconducting-like behavior (dρ/dT<0) and value of resistivity increases with increasing Ti-content. The Seebeck coefficients of all samples are positive values for all temperature ranges evidencing the conduction mechanisms mainly governed by holes. The maximum power factor values have been obtained in Ti=0 sample as 0.07 mW/K2 at around 6500C and power factor values also decrease with increasing Ti-content.
DescriptionResumen del trabajo presentado a la International Conference on Condensed Matter and Materials Science (ICCMMS), celebrada en Adana (Turquia) del 11 al 15 de octubre de 2017.
Appears in Collections:(ICMA) Comunicaciones congresos
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