Publication

Na-ion dynamics in Quasi-1D compound NaV2O4

Martin Mansson
2014
Conference Papers

Résumé

We have used the pulsed muon source at ISIS to study high-temperature Na-ion dynamics in the quasi-one-dimensional (Q1D) metallic antiferromagnet NaV2O4. By performing systematic zero-field and longitudinal-field measurements as a function of temperature we clearly distinguish that the hopping rate increases exponentially above T-diff similar to 250 K. The data is well fitted to an Arrhenius type equation typical for a diffusion process, showing that the Na-ions starts to be mobile above TdIff.. Such results make this compound very interesting for the tuning of Q1D magnetism using atomic-scale ion-texturing through the periodic potential from ordered Na-vacancies. Further, it also opens the door to possible use of NaV2O4 and related compounds in energy related applications.

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https://infoscience.epfl.ch/entities/publication/d40fc9aa-2e48-48ba-9885-4edaa379101c

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Martin Mansson
2014
Conference Papers

Résumé

Source officielle

https://infoscience.epfl.ch/entities/publication/d40fc9aa-2e48-48ba-9885-4edaa379101c

À propos de ce résultat

Concepts associés (21)

Metal ions in aqueous solution

A metal ion in aqueous solution or aqua ion is a cation, dissolved in water, of chemical formula [M(H2O)n]z+. The solvation number, n, determined by a variety of experimental methods is 4 for Li+ and Be2+ and 6 for most elements in periods 3 and 4 of the periodic table. Lanthanide and actinide aqua ions have higher solvation numbers (often 8 to 9), with the highest known being 11 for Ac3+. The strength of the bonds between the metal ion and water molecules in the primary solvation shell increases with the electrical charge, z, on the metal ion and decreases as its ionic radius, r, increases.

Potentiel électrochimique de membrane

Toute cellule biologique est entourée d'une membrane dite membrane plasmique. Cette membrane est relativement imperméable aux espèces électriquement chargées telles que les ions et aux molécules qui peuvent participer à l'activité électrochimique (molécules polaires) telles que l'eau. Elle présente ainsi une grande résistance électrique et forme en quelque sorte un dipôle (comme un condensateur). Grâce à ces propriétés, la membrane sépare en deux compartiments étanches l'intérieur de la cellule, le cytoplasme, de l'extérieur de la cellule, le milieu extracellulaire.

Gating (electrophysiology)

In electrophysiology, the term gating refers to the opening (activation) or closing (by deactivation or inactivation) of ion channels. This change in conformation is a response to changes in transmembrane voltage. When ion channels are in a 'closed' (non-conducting) state, they are impermeable to ions and do not conduct electrical current. When ion channels are in their open state, they conduct electrical current by allowing specific types of ions to pass through them, and thus, across the plasma membrane of the cell.

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