报告题目：Understanding and tuning full-Heusler thermoelectric materials based on Fe2VAl
主讲嘉宾：Prof. Ernst Bauer
Institute of Solid State Physics, Technische University Wien
活动时间：8月17日（周五）下午14:00—16:00
活动地点：师昌绪楼403会议室
报告简介：
Cubic full-Heusler, X2YZ, and half-Heusler XYZ systems have been proven to be very promising active thermoelectric materials because i) of their thermoelectric performance and ii) because of outstanding thermal and mechanical properties, important for applications in different domains. X and Y are (in general) transition metal elements and Z is a main group element. Although X, Y and Z elements are metallic in solid form, many of the full-Heusler and half-Heusler systems turn out to be semiconductors or, at least, the respective Fermi energy is located very near to a gap in the electronic density of states. Such a scenario is a pre-requisite for capable thermoelectric materials.
In this contribution, we report on tuning of full-Heusler systems based on Fe2VAl by substituting appropriate elements on all lattice sites of the Cu2MnAl type structure and a deeper understanding of the resulting relevant electronic and thermal properties by combining experiments carried out in a broad temperature range and first principles calculations in terms of the density functional theory (DFT) using the programme package VASP.
Depending whether these materials are manufactured as bulk or as thin films, a variety of unexpected features, like meta-stable states, behaviours reminiscent of high entropy alloys, huge logarithmic derivatives of the electronic density of states or certain types of protected states are observed (both latter from DFT calculations), which might positively influence the thermoelectric behaviour of this family of compounds.
Research supported by the “Christian Doppler Laboratory for Thermoelectricity”
主讲嘉宾简介：
Prof. Ernst Bauer obtained his Ph.D. in 1984 from the Vienna University of Technology. He got his postdoctoral lecture qualification in 1991 and became associate professor at the Vienna University of Technology in 1997. In 2009 he was awarded University Professor at the Vienna University of Technology. His research is focused on strongly correlated electron systems at extreme conditions, on superconductivity and thermoelectric materials. In 2004 he detected superconductivity in heavy fermion materials without inversion symmetry. He was the head of European Union COST programme P16 ‘‘ECOM’’, was chairman of the International Conference on Strongly Correlated Electron Systems, SCES’05 and '15 and of the Austrian neutron and synchrotron user community. In 2013 he received a “Christian Doppler Laboratory for Thermoelectricity".
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