Improvement of Bi2Sr2Co1.8Ox thermoelectric properties by laser floating zone texturing

Growth rate effect on microstructure and thermoelectric properties of melt grown Bi2Ba2Co2Oxtextured ceramics

“…The highest value at 650 ºC has been found to be ∼ 150 µV/K for the 90 mm/h grown sample around 140% higher than the best reported one for this composition at the same temperature (around 110 µV/K). 22 The reason for obtaining such high S values in the LFZ grown samples, with respect to those obtained on samples prepared using conventional synthetic routes, is due to the formation of considerable amounts of oxygen vacancies on the thermoelectric phase when samples are textured using the LFZ technique. 23,24 This effect has also been observed in the misfit phase …”

Enhancement of Ca 3 Co 4 O 9 thermoelectric properties by Cr for Co substitution

“…On the other hand, they possess some drawbacks, as the high price of the spark plasma device and the relatively long processing time of the hot uniaxial pressing or the TGG. In the case of the processes involving samples melting, it has been reported that the electrical properties are strongly dependents on the growth speed [19,[22][23][24][25].…”

Influence of Ca substitution by Mg on the Ca₃Co₄O₉ performances

“…On the other hand, they possess some drawbacks, as the high price of the spark plasma device and the relatively long processing time of the hot uniaxial pressing or the TGG. In the case of the processes involving samples melting, it has been reported that the electrical properties are strongly dependent on the growth speed [15,[21][22][23]. All these drawbacks have, as a consequence, an important influence on the industrial interest for the materials processed by these techniques.…”