Nanoscale clusters in the high performance thermoelectric AgPbmSbTem+2
H. Lin, E. S. Bozin, S. J. L. Billinge, E. Quarez, M. G. Kanatzidis
TL;DR
This study reveals that AgPbmSbTem+2 thermoelectric materials contain nanoscale inclusions of AgPb3SbTe5 within a PbTe matrix, identified through PDF analysis and HRTEM, which may influence their thermoelectric performance.
Contribution
The paper demonstrates the presence of nanoscale inclusions in AgPbmSbTem+2 using combined PDF and HRTEM analysis, providing new structural insights.
Findings
Nanoscale inclusions of AgPb3SbTe5 identified
Inclusions are randomly embedded in PbTe matrix
Structural analysis enhances understanding of thermoelectric properties
Abstract
The local structure of the AgPbmSbTem+2 series of thermoelectric materials has been studied using the atomic pair distribution function (PDF) method. Three candidate-models were attempted for the structure of this class of materials using either a one-phase or a two-phase modeling procedure. Combining modeling the PDF with HRTEM data we show that AgPbmSbTem+2 contains nanoscale inclusions with composition close to AgPb3SbTe5 randomly embedded in a PbTe matrix.
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