Electron Microscopy Laboratory

Research Highlights

Microstructurally-Enhanced Electronic Transport in Pr-doped SrTiO3 Ceramics

Microstructurally-Enhanced Electronic Transport in Pr-doped SrTiO3 Ceramics

Researchers from the Complex and Advanced Materials Lab at Clemson Univeristy, in collaboration with the Functional Nanomaterials & Devices laboratory at King Abdullah University of Science and Technology (KAUST) reported a novel synthesis strategy to prepare high-performance bulk polycrystalline Pr-doped SrTiO3 thermoelectric ceramics. Upon employing a novel synthesis strategy using spark plasma sintering technique, the grains of bulk polycrystalline Pr-doped SrTiO3 ceramics were enhanced with Pr-rich grain boundaries which improved their thermoelectric properties. Specifically, this morphology resulted in a significant improvement in carrier mobility and the thermoelectric power factor in this broadly functional oxide material.  Led by Professor Terry M. Tritt at Clemson University, the scientific team achieved a large thermoelectric power factor, a measure of the potential of electronic properties of a material for thermoelectric application, of 1.3 Wm–1K 1 at 500 °C (> 70% improvement over the previous reports at this temperature). This work provides new directions to higher performance oxide thermoelectrics as well as possibly other properties and applications of this broadly functional perovskite material.

Reference

Arash Mehdizadeh Dehkordi, Sriparna Bhattacharya, Taghi Darroudi, Jennifer W. Graff, Udo Schwingenschlögl, Husam N. Alshareef, and Terry M. Tritt, “Large Thermoelectric Power Factor in Pr-Doped SrTiO3−δ Ceramics via Grain-Boundary-Induced Mobility Enhancement”, Chem. Mater. 201426, 2478–2485

Acknowledgment

The funding for this project is provided by the Faculty Initiated Collaboration (FIC) competitive grant from KAUST.