About this Abstract |
Meeting |
MS&T23: Materials Science & Technology
|
Symposium
|
Energy Materials for Sustainable Development
|
Presentation Title |
Texturing Ca3Co4-xO9-δ Ceramics via Electrospun Nanoribbons: A Route to High-performance Thermoelectrics |
Author(s) |
Armin Feldhoff, Katharina Kruppa, Itzhak I Maor, Frank Steinbach, Meirav Mann-Lahav, Gideon S Grader |
On-Site Speaker (Planned) |
Armin Feldhoff |
Abstract Scope |
Calcium cobaltite Ca3Co4-xO9+δ is a promising p-type thermoelectric material with good functional properties for high-temperature applications in air. Its strong anisotropic properties make texturing and nanostructuring mostly favored to improve thermoelectric performance. Mats of flat-shaped nanofibers, designated nanoribbons, were produced by electrospinning, and they were further processed into textured ceramics. Nanoribbons are considered to contribute to sample texturing via aligned orientation of the primary particles and to provide more efficient packing due to their flatness compared to cylindrical nanofibers, allowing higher densification in the green body and ceramic. Texturing in green bodies and ceramics from nanoribbons mats were investigated using X-ray diffraction pole figures. In addition, microstructure, as obtained by scanning electron microscopy and transmission electron microscopy, was correlated to Seebeck coefficient and electrical conductivity of the nanoribbon-based samples to evaluate their thermoelectric abilities. |