Inelastic neutron scattering study of the lattice dynamics of the homologous series (PbSe)5(Bi2Se3)3m (m = 1, 2 and 3)
The search for efficient thermoelectric materials has witnessed a resurgence of interest over the last two decades. An ideal thermoelectric compound should meet two conflicting requirements: the thermal transport should mimic that of a glass while the electrical properties should be those of crystalline solids. One possible strategy resides in choosing materials which show intrinsically low lattice thermal conductivity values. The homologous series (PbSe)5(Bi2Se3)3m (m = 1, 2 and 3) were shown to harbor a transition from trivial band insulator (m = 1) to bulk topological insulating properties (m = 2) by simply varying the number of Bi2Se3 layers and to exhibit extremely low lattice thermal conductivity values. We recently initiated a detailed study of these compounds with the aim of assessing the potential of these compounds for thermoelectric applications. In this context, we would like to investigate their lattice dynamics via inelastic neutron scattering experiments on IN6 between 100 and 500 K to shed light on the microscopic mechanisms that disrupt efficiently the heat-carrying phonons and on the influence of the number of Bi2Se3 layers on the thermal transport.
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CANDOLFI Christophe; KOZA Michael Marek; LENOIR Bertrand and SASSI Selma. (2016). Inelastic neutron scattering study of the lattice dynamics of the homologous series (PbSe)5(Bi2Se3)3m (m = 1, 2 and 3). Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-01-446
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