Influence of thermal conductivity and of non-constant relaxation time on thermoelectricity in Mg3Sb2 | Zendy

Roberta Farris | Zendy; Maria Barbara Maccioni | Zendy; Alessio Filippetti | Zendy; Vincenzo Fiorentini | Zendy

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Influence of thermal conductivity and of non-constant relaxation time on thermoelectricity in Mg₃Sb₂

Author(s) -

Roberta Farris,

Maria Barbara Maccioni,

Alessio Filippetti,

Vincenzo Fiorentini

Publication year - 2019

Publication title -

journal of physics conference series

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.21

H-Index - 85

eISSN - 1742-6596

pISSN - 1742-6588

DOI - 10.1088/1742-6596/1226/1/012010

Subject(s) - boltzmann constant , thermal conductivity , thermoelectric effect , figure of merit , condensed matter physics , boltzmann equation , relaxation (psychology) , constant (computer programming) , monotonic function , materials science , range (aeronautics) , electrical resistivity and conductivity , thermodynamics , thermoelectric materials , physics , mathematics , quantum mechanics , mathematical analysis , psychology , social psychology , computer science , composite material , programming language , optoelectronics

We discuss the effects of different approximations to thermal conductivity and relaxation time on the thermoelectric figure of merit ZT in n -doped Mg 3 Sb 2 . We use density-functional electronic structure and Bloch-Boltzmann transport theory with an energy-dependent relaxation time. ZT is monotonically increasing with T in our range (300-700 K) with a maximum value of ∼1.5.

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