Add time:08/09/2019         Source:sciencedirect.com

High-pressure X-ray diffraction has been used to probe the behavior of the superionic conductor silver mercury iodide (Ag2HgI4) at pressures up to 5 GPa and at temperatures from 295 to 370 K. Significant changes in the diffraction spectra, indicative of structural transitions, are observed around 0.7 and 1.3 GPa across the range of temperatures studied. The change at 0.7 GPa is shown to correspond to the dissociation of silver mercury iodide into silver iodide and mercury iodide, i.e., Ag2HgI4→2AgI+HgI2. The second transition, at 1.3 GPa, is due to a structural phase transition within HgI2. Rietveld analysis of the diffraction data is used to confirm and refine all the known crystal structures.

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