TY - JOUR
T1 - In situ XAFS and XRD studies of pressure-induced local structural change in liquid AgI
AU - Arima, H.
AU - Ohtaka, O.
AU - Hattori, T.
AU - Katayama, Y.
AU - Utsumi, W.
AU - Yoshiasa, A.
PY - 2007/2/14
Y1 - 2007/2/14
N2 - In order to examine the pressure-induced structural change of liquid silver iodide (AgI), high-pressure and high-temperature in situ x-ray absorption fine structure (XAFS) and x-ray diffraction (XRD) studies have been carried out up to 1200K and 6GPa. The modifications in the x-ray absorption near edge structure (XANES) spectra and x-ray structure factors, S(Q), with increasing pressure provide evidence for changes in the short-range order of liquid AgI. The I-Ag bond length in liquid AgI increases by compression up to 2GPa, which proposes that components with higher coordination than fourfold are introduced. The I-Ag bond length decreases monotonically with compression above 2GPa, indicating that the structural change involving a coordination-number change is completed below 2GPa and then a high-pressure form of liquid AgI is stabilized. Comparing the I-Ag bond lengths of liquid AgI with those of crystalline phases, we conclude that the high-pressure form of liquid AgI has a rocksalt-like structure with large vacancies.
AB - In order to examine the pressure-induced structural change of liquid silver iodide (AgI), high-pressure and high-temperature in situ x-ray absorption fine structure (XAFS) and x-ray diffraction (XRD) studies have been carried out up to 1200K and 6GPa. The modifications in the x-ray absorption near edge structure (XANES) spectra and x-ray structure factors, S(Q), with increasing pressure provide evidence for changes in the short-range order of liquid AgI. The I-Ag bond length in liquid AgI increases by compression up to 2GPa, which proposes that components with higher coordination than fourfold are introduced. The I-Ag bond length decreases monotonically with compression above 2GPa, indicating that the structural change involving a coordination-number change is completed below 2GPa and then a high-pressure form of liquid AgI is stabilized. Comparing the I-Ag bond lengths of liquid AgI with those of crystalline phases, we conclude that the high-pressure form of liquid AgI has a rocksalt-like structure with large vacancies.
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U2 - 10.1088/0953-8984/19/7/076104
DO - 10.1088/0953-8984/19/7/076104
M3 - Article
C2 - 22251586
AN - SCOPUS:33947592578
VL - 19
JO - Journal of Physics Condensed Matter
JF - Journal of Physics Condensed Matter
SN - 0953-8984
IS - 7
M1 - 076104
ER -