| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Advances in Dielectric Materials and Electronic Devices
|
| Presentation Title |
D-1: Designing Rare Earth Free High Entropy Oxide with Tungsten Bronze Structure for Thermoelectric Application |
| Author(s) |
Subhra Sourav Jana, Tanmoy Maiti |
| On-Site Speaker (Planned) |
Tanmoy Maiti |
| Abstract Scope |
In the last 5 years, forming high entropy oxides have emerged as one of the promising approaches to design thermoelectric oxides. Entropy engineering is an excellent strategy to improve thermoelectric performance by formation of high symmetry crystal and generating anharmonicity for multi-phonon scattering. In the present work, we have successfully synthesized rare earth free novel high entropy (SrBaLiKNa)0.2Nb2O6 with single phase tungsten bronze structure. This is the first report on thermoelectric properties of high entropy tungsten bronze type structures. We have obtained maximum Seebeck coefficient of -370μVK^(-1) at 1150K, which is the highest among SBN based oxides. The minimum thermal conductivity of 0.54WmK is obtained at 330K, which is so far the lowest reported value among oxide thermoelectrics. This rare combination of large Seebeck and record low thermal conductivity allow us in attaining maximum ZT value of 0.23, which is so far the highest among high entropy-based oxide thermoelectrics. |