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

D. C. Parfitt; S. Hull; D. A. Keen; W. Crichton

doi:10.1016/j.jssc.2004.06.039

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

D. C. Parfitt, S. Hull, D. A. Keen, W. Crichton

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

Representative X-ray diffraction spectra illustrating the pressure-induced dissociation of Ag ₂HgI ₄ into rocksalt-structured AgI (marked with arrows in the bottom three plots) and HgI ₂. A structural phase transition is observed within the latter at ≈1.3 GPa. High-pressure X-ray diffraction has been used to probe the behavior of the superionic conductor silver mercury iodide (Ag ₂HgI ₄) 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., Ag ₂HgI ₄→ 2AgI+HgI ₂. The second transition, at 1.3 GPa, is due to a structural phase transition within HgI ₂. Rietveld analysis of the diffraction data is used to confirm and refine all the known crystal structures.

Original language	English
Pages (from-to)	3715-3720
Number of pages	6
Journal	Journal of Solid State Chemistry
Volume	177
Issue number	10
DOIs	https://doi.org/10.1016/j.jssc.2004.06.039
Publication status	Published - 1 Oct 2004
Externally published	Yes

Keywords

Dissociation
High-pressures
Silver mercury iodide
Superionic conduction
X-ray diffraction

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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10.1016/j.jssc.2004.06.039

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title = "High-pressure dissociation of silver mercury iodide, Ag 2HgI 4",

abstract = "Representative X-ray diffraction spectra illustrating the pressure-induced dissociation of Ag 2HgI 4 into rocksalt-structured AgI (marked with arrows in the bottom three plots) and HgI 2. A structural phase transition is observed within the latter at ≈1.3 GPa. High-pressure X-ray diffraction has been used to probe the behavior of the superionic conductor silver mercury iodide (Ag 2HgI 4) 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., Ag 2HgI 4→ 2AgI+HgI 2. The second transition, at 1.3 GPa, is due to a structural phase transition within HgI 2. Rietveld analysis of the diffraction data is used to confirm and refine all the known crystal structures.",

keywords = "Dissociation, High-pressures, Silver mercury iodide, Superionic conduction, X-ray diffraction",

author = "Parfitt, {D. C.} and S. Hull and Keen, {D. A.} and W. Crichton",

year = "2004",

month = oct,

day = "1",

doi = "10.1016/j.jssc.2004.06.039",

language = "English",

volume = "177",

pages = "3715--3720",

journal = "Journal of Solid State Chemistry",

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TY - JOUR

T1 - High-pressure dissociation of silver mercury iodide, Ag 2HgI 4

AU - Parfitt, D. C.

AU - Hull, S.

AU - Keen, D. A.

AU - Crichton, W.

PY - 2004/10/1

Y1 - 2004/10/1

N2 - Representative X-ray diffraction spectra illustrating the pressure-induced dissociation of Ag 2HgI 4 into rocksalt-structured AgI (marked with arrows in the bottom three plots) and HgI 2. A structural phase transition is observed within the latter at ≈1.3 GPa. High-pressure X-ray diffraction has been used to probe the behavior of the superionic conductor silver mercury iodide (Ag 2HgI 4) 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., Ag 2HgI 4→ 2AgI+HgI 2. The second transition, at 1.3 GPa, is due to a structural phase transition within HgI 2. Rietveld analysis of the diffraction data is used to confirm and refine all the known crystal structures.

AB - Representative X-ray diffraction spectra illustrating the pressure-induced dissociation of Ag 2HgI 4 into rocksalt-structured AgI (marked with arrows in the bottom three plots) and HgI 2. A structural phase transition is observed within the latter at ≈1.3 GPa. High-pressure X-ray diffraction has been used to probe the behavior of the superionic conductor silver mercury iodide (Ag 2HgI 4) 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., Ag 2HgI 4→ 2AgI+HgI 2. The second transition, at 1.3 GPa, is due to a structural phase transition within HgI 2. Rietveld analysis of the diffraction data is used to confirm and refine all the known crystal structures.

KW - Dissociation

KW - High-pressures

KW - Silver mercury iodide

KW - Superionic conduction

KW - X-ray diffraction

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