Strain effects to optimize thermoelectric properties of hole-doped La 2 NiO 4+δ viaab initiocalculations
Year: 2013
Type: article
Abstract: Thermoelectric properties of the system La${}_{2}$NiO${}_{4+\ensuremath{\delta}}$ have been recently discussed [V. Pardo, A. S. Botana, and D. Baldomir, Phys. Rev. B 86, 165114 (2012)] via ab initio calculations. An optimum hole-doping value was obtained with reasonable thermopower and thermoelectric figure of merit being calculated. Here, a large increase in the thermoelectric performance through lattice strain and the corresponding atomic relaxations is predicted. This increase would be experimentally attainable via growth in thin films of the material on top of different substrates. A small tensile strain would produce large thermoelectric figures of merit at high temperatures, $zT$ $\ensuremath{\sim}$ 1 in the range of oxygen excess $\ensuremath{\delta}\ensuremath{\sim}0.05$--0.10 and in-plane lattice parameter in the range 3.95--4.05 \AA{}. In that relatively wide range of parameters, thermopower values close to 200 $\ensuremath{\mu}$V/K are obtained. The best performance of this compound is expected to occur in the high-temperature limit.
Source: Physical Review B
Authors: Victor Pardo, Antia S. Botana, Daniel Baldomir
Institution: Universidade de Santiago de Compostela
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1602450746