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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.

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Official URL: http://iopscience.iop.org/0953-8984/1/8/012

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
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.ernet.in/id/eprint/31547

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