Open AccessInfluence 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.