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 | |
| Publication status | Published - 1 Oct 2004 |
| Externally published | Yes |
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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
Cite this
High-pressure dissociation of silver mercury iodide, Ag 2HgI 4. / Parfitt, D. C.; Hull, S.; Keen, D. A.; Crichton, W.
In: Journal of Solid State Chemistry, Vol. 177, No. 10, 01.10.2004, p. 3715-3720.Research output: Contribution to journal › Article
}
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
UR - http://www.scopus.com/inward/record.url?scp=7044253607&partnerID=8YFLogxK
U2 - 10.1016/j.jssc.2004.06.039
DO - 10.1016/j.jssc.2004.06.039
M3 - Article
VL - 177
SP - 3715
EP - 3720
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
SN - 0022-4596
IS - 10
ER -