Reduction in Processing Time in CaCoO Ceramics through Nanoprecursors Produced by an Easily Scalable and Environmentally Friendly Process.

Attrition milling is an easily scalable and environmentally friendly process used to produce CaCoO nanoprecursors in a relatively short time. Sintered materials produced through the classical solid-state method, involving ball milling, show much larger grain sizes and slightly lower density than those obtained in samples produced from attrition-milled precursors. On the other hand, electrical resistivity has been drastically decreased, accompanied with a slight decrease in the Seebeck coefficient in samples obtained from these attrition-milled precursors.

Influence of Ag on the Properties of CaYbMnO₃ Sintered Ceramics.

In this study, CaYbMnO₃ + x wt.% Ag (with x = 0, 1, 3, 5, and 10) thermoelectric materials were prepared via the classical ceramic method. In spite of the very high sintering temperature (1300 °C), no significant Ag losses were observed following this process.

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

[Bi₂Ba₂O₄][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.