Correlation of Variations in Thermoelectric and Microstructural Properties of P-type CeFe4Sb12 Melt-Spun Ribbons Using a Rapid Screening Method
Yonggao Y. Yan, Winnie K. Wong-Ng, James A. Kaduk, Gangjian Tan, Wenjie Xie, Martin L. Green, Xinfeng Tang
We have demonstrated the effect of gradients in both phase composition and microstructure of p-type CeFe4Sb12 melt-spun (MS) ribbons on Seebeck coefficient by a thermoelectric (TE) screening tool, in conjunction with XRD and DSC measurements. The spatial Seebeck coefficient variation was found to correlate with the variation of the phase composition and microstructure along the thickness and across the width of the ribbons. The observed gradient was the result of a post-annealing effect due to the thermal lag between the contact surface with the roller and the free surface. Possibilities are discussed for further improvements in the TE properties of bulk material densified from MS ribbons, by tailoring the ribbon microstructure. The results presented illustrate the successful application of our screening tool to the 3D variation of Seebeck coefficient in a model TE material.
, Wong-Ng, W.
, Kaduk, J.
, Tan, G.
, Xie, W.
, Green, M.
and Tang, X.
Correlation of Variations in Thermoelectric and Microstructural Properties of P-type CeFe4Sb12 Melt-Spun Ribbons Using a Rapid Screening Method, Applied Physics Letters, [online], https://doi.org/10.1063/1.3570690
(Accessed February 22, 2024)