High-pressure NMR investigations of the protonic conductor (NH4)4Fe(CN)6.1.5H2O

Balasubramanyan, DR and Bhat, SV (1989) High-pressure NMR investigations of the protonic conductor (NH4)4Fe(CN)6.1.5H2O. In: Journal of Physics: Condensed Matter, 1 (8). pp. 1495-1502.

PDF high.pdf - Published Version Restricted to Registered users only Download (541kB) | Request a copy

Abstract

The effect of high hydrostatic pressure up to 1.5 GPa on ionic motion in (NH4)4Fe(CN)6.1.5H2O has been studied by wide-line 1H NMR experiments performed in the temperature range from room temperature to 77 K. The experiments at room temperature have shown a large increase in the second moment at 0.45 GPa as a result of a pressure-induced phase transition. The temperature dependence study up to 0.425 GPa has shown a gradual increase in the values of activation energy and attempt frequency with increase in pressure. The activation volume for motion at 300 K has been estimated to be 6% of molar volume. Vacancy-assisted ionic jumps are concluded to be the mode of charge transport. Second moments estimated at 77 K show evidence for tunnelling reorientation of at least one of the two NH4+ groups in the compound.

Item Type:	Journal Article
Publication:	Journal of Physics: Condensed Matter
Publisher:	Institute of Physics
Additional Information:	Copyright of this article belongs to Institute of Physics.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	26 Aug 2010 10:09
Last Modified:	19 Sep 2010 06:14
URI:	http://eprints.iisc.ac.in/id/eprint/31547

Actions (login required)

View Item