Near constant loss regime in fast ionic conductors analyzed by impedance and NMR spectroscopies

0432540 - FZÚ 2015 RIV GB eng J - Journal Article
Bucheli, W. - Arbi, K. - Sanz, J. - Nuzhnyy, Dmitry - Kamba, Stanislav - Várez, A. - Jimenez, R.
Near constant loss regime in fast ionic conductors analyzed by impedance and NMR spectroscopies.
Physical Chemistry Chemical Physics. Roč. 16, č. 29 (2014), s. 15346-15354. ISSN 1463-9076. E-ISSN 1463-9084
R&D Projects: GA ČR GAP204/12/0232
Institutional support: RVO:68378271
Keywords : microwave impedance spectroscopy * NMR * ionic conductivity
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 4.493, year: 2014

Universal dielectric response and nearly constant loss dispersive regimes have been investigated in fast ion conductors with perovskite and NASICON structure by using NMR and impedance spectroscopy. In perovskite compounds, local motions produced inside unit cells are responsible for the large "near constant loss" regime detected at low temperatures, however, in the case of NASICON compounds, local motions not participating in long-range charge transport were not detected. In both analyzed systems long-range correlated motions are responsible for dc-conductivity values of ceramics grains near 10 -3 S cm -1 at room temperature, indicating that low-temperature local motions, are not required to achieve the highest ionic conductivities.
Permanent Link: http://hdl.handle.net/11104/0236883