Decoupling Seebeck coefficient and resistivity, and simultaneously optimizing thermoelectric and mechanical performances for n-type BiTeSe alloy by multi-pass equal channel angular extrusion

[Display omitted] •Decoupling Seebeck coefficient and resistivity.•The mechanism of grain refinement was investigated by experiment and simulation.•Increasing the number of extrusion pass could not refine the grain already refined. Equal channel angular extrusion (ECAE) has become a new process for...

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