High-pressure dissociation of silver mercury iodide, Ag{sub 2}HgI{sub 4}

Journal Article · Fri Oct 01 04:00:00 EDT 2004 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2004.06.039· OSTI ID:20653389

Parfitt, D C ^[1]; Hull, S ^[2]; Keen, D A ^[1]; Crichton, W ^[3]

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1. Department of Physics, Oxford University, Parks Road, Oxford OX1 3PU (United Kingdom)
2. ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX (United Kingdom)
3. ESRF, 6 Rue Jules Horowitz, BP 220, 38043 Grenoble CEDEX 9 (France)

High-pressure X-ray diffraction has been used to probe the behavior of the superionic conductor silver mercury iodide (Ag{sub 2}HgI{sub 4}) at pressures up to 5GPa and at temperatures from 295 to 370K. Significant changes in the diffraction spectra, indicative of structural transitions, are observed around 0.7 and 1.3GPa across the range of temperatures studied. The change at 0.7GPa is shown to correspond to the dissociation of silver mercury iodide into silver iodide and mercury iodide, i.e., Ag{sub 2}HgI{sub 4}->2AgI+HgI{sub 2}. The second transition, at 1.3GPa, is due to a structural phase transition within HgI{sub 2}. Rietveld analysis of the diffraction data is used to confirm and refine all the known crystal structures.

• OSTI ID: 20653389
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 10 Vol. 177; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CRYSTAL STRUCTURE
DISSOCIATION
MERCURY IODIDES
PHASE TRANSFORMATIONS
PRESSURE RANGE GIGA PA
SILVER IODIDES
SPECTRA
X-RAY DIFFRACTION