Galeano-Cabral Jorge R, Schundelmier Benny, Oladehin Olatunde, Feng Keke, Ordonez Juan C, Baumbach Ryan E, Wei Kaya
FAMU-FSU College of Engineering, Florida State University, Tallahassee, FL 32310, USA.
National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA.
Materials (Basel). 2024 Apr 19;17(8):1906. doi: 10.3390/ma17081906.
Thermoelectric devices are both solid-state heat pumps and energy generators. Having a reversible process without moving parts is of high importance for applications in remote locations or under extreme conditions. Yet, most thermoelectric devices have a rather limited energy conversion efficiency due to the natural competition between high electrical conductivity and low thermal conductivity, both being essential conditions for achieving a high energy conversion efficiency. Heavy-fermion compounds YbZn ( = Co, Rh, Ir) have been reported to be potential candidate materials for thermoelectric applications at low temperatures. Motivated by this result, we applied chemical substitution studies on the transition metal site in order to optimize the charge carrier concentration as well as promote more efficient phonon scatterings. Here, we present the latest investigation on the Ni-doped specimens YbCoNiZn, where enhanced thermoelectric figure of merit values have been obtained.
热电装置既是固态热泵又是能量发生器。对于在偏远地区或极端条件下的应用而言，拥有一个无运动部件的可逆过程至关重要。然而，由于高电导率和低导热率之间的天然竞争，而这两者都是实现高能量转换效率的必要条件，大多数热电装置的能量转换效率相当有限。据报道，重费米子化合物YbZn（=Co、Rh、Ir）是低温热电应用的潜在候选材料。受此结果的激励，我们对过渡金属位点进行了化学取代研究，以优化载流子浓度并促进更有效的声子散射。在此，我们展示了对Ni掺杂样品YbCoNiZn的最新研究，其中获得了增强的热电优值。
