Exploring the high-temperature crystallographic features of thermoelectric materials based on SrTiO3 perovskite
Recently, some oxides have been investigated as environment-friendly thermoelectric materials, in particular, some reduced or donor-doped perovskite-type titanates derived from SrTiO3, showing n-type metallic behavior with large Seebeck coefficients. Here we propose to study several series of compounds involving different doping strategies, either at the Sr or Ti positions of the SrTiO3 perovskite, and the incorporation of vacancies at Sr positions and at the oxygen sublattice in order to decrease the thermal conductivity and improve the figure of merit.The goal of this proposal is twofold: i) to analyze the effect of doping on the crystal structure of three series of compounds: Sr0.9R0.1TiO3-d (R= Ce, Pr, Nd, Eu); SrTi1-xMxO3-d (M= Nb, Ta, Mo, W) and the corresponding Sr-defective specimens, in connection with their thermoelectric properties, and ii) to investigate their temperature evolution with emphasis in the anisotropic displacement parameters analyzed in terms of Einstein oscillators yielding the characteristic energies corresponding to each phonon mode. For this task we ask for 4 days at D2B diffractometer provided with a furnace.
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C. A. López; ALONSO Jose Antonio; FERNANDEZ DIAZ Maria Teresa; Sergio Federico Mayer; PINACCA RUBEN and Jesus Prado-Gonjal. (2018). Exploring the high-temperature crystallographic features of thermoelectric materials based on SrTiO3 perovskite. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-24-602
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