Unveiling the oxide-ion diffusion in the new solid electrolytes Sr1-xKxSiO3 (x= 0.2, 0.4)
The Sr1-xAxSiO3-0.5-delta (with A= Na, K) family has been proposed as a highly promising novel class of electrolyte materials showing good oxide-ion conductivity values at intermediate temperatures. However, there is some debate on the origin of the ionic conductivity in this system, perhaps arising from metastable glassy phases. Some studies showed that the Na occupancy on the Sr sites tended to zero while the oxygen sites tended to full occupancy. In contrast with these results, preliminary NPD refinements in test time on a carefully prepared Sr0.6K0.4SiO3-delta sample corroborated that the K occupancy on the Sr sites is significant and there is a conspicuous oxygen deficiency. Here we propose an "in situ" NPD study of Sr1-xKxSiO3-delta (x= 0.2, 0.4) compounds at high temperature, in the 25-1000ºC range, allowing us the refinement of accurate occupancy and thermal factors for the 5 unequivalent oxygen atoms in the unit cell, thus unveiling the oxygen diffusion path for this promising electrolyte.
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ALONSO Jose Antonio; CASCOS JIMENEZ Vanessa Amelia; FERNANDEZ DIAZ Maria Teresa; GOODENOUGH John B.; C. A. López and MARTINEZ Ruben. (2017). Unveiling the oxide-ion diffusion in the new solid electrolytes Sr1-xKxSiO3 (x= 0.2, 0.4). Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-23-689
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