High-pressure neutron powder diffraction on the solid solution series (ND4)xK1-xI

Knorr, K., Krimmel, A., Loidl, A. and Depmeier, W. (1997) High-pressure neutron powder diffraction on the solid solution series (ND4)xK1-xI Physica B: Condensed Matter, 234-236 . pp. 407-408. DOI 10.1016/s0921-4526(96)01045-9.

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The system (NH4)xK1-xI is known to possess a variety of phase transitions, depending on the concentration x. For x [less-than-or-equals, slant] 0.5 it shows an orientational glass state below a freezing temperature TF [approximate] 10 K. The effect of deuteration has not been studied so far. To get insight into the structural influence of an increased tunneling potential for the ammonium ions, we investigated the phase diagram of the deuterated homologues for x = 0.5, 0.7 and 0.8 at ambient conditions and under applied pressure of up to 13 kbar by powder neutron diffraction. At ambient conditions (ND4)xK1-xI for x = 0.5, 0.7 and 0.8 shows the same NaCl-type structure ([alpha]-phase) as its protonated homologues. A transition into a primitive cubic high-pressure phase has been detected. This phase transition is completely reversible. The transition pressure depends on x. We discuss a CsCl-like structure for the high-pressure phase.

Document Type: Article
Keywords: High pressure Phase transitions Powder diffraction
Research affiliation: Kiel University
DOI etc.: 10.1016/s0921-4526(96)01045-9
ISSN: 0921-4526
Date Deposited: 02 Feb 2012 09:19
Last Modified: 08 Oct 2012 07:33
URI: http://eprints.uni-kiel.de/id/eprint/15537

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