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Fuchizaki, Kazuhiro*; Hamaya, Nozomu*; Katayama, Yoshinori
Journal of the Physical Society of Japan, 82(3), p.033003_1 - 033003_4, 2013/03
Times Cited Count：12 Percentile：60.3(Physics, Multidisciplinary)An in situ synchrotron X-ray absorption measurement was carried out to estimate the density of liquid SnI. The characteristic densities of the low- and high-pressure liquids were found to be 4.6-4.7 and 4.9-5.0 g/cm
, respectively, and their region is separated at around 1.7 GPa. The difference in density, although a slight amount of 0.3-0.4 g/cm, strongly suggests the existence of a weak but discontinuous phase transition at that pressure between the two liquid regions.
Fuchizaki, Kazuhiro*; Hamaya, Nozomu*; Hase, Takaki*; Katayama, Yoshinori
Journal of Chemical Physics, 135(9), p.091101_1 - 091101_4, 2011/09
Times Cited Count：14 Percentile：44.6(Chemistry, Physical)We have shown from in situ synchrotron X-ray diffraction measurements that there are two thermodynamically stable liquid forms of SnI, depending on the pressure. Based on the liquid-liquid critical point scenario, our recent measurements suggest that the second critical point, if it exists, may be located in a region close to the point at which the melting curve of the crystalline phase abruptly breaks. This region is, unlike that of water, experimentally accessible with relative ease.
Fuchizaki, Kazuhiro*; Hase, Takaki*; Yamada, Akihiro*; Hamaya, Nozomu*; Katayama, Yoshinori; Funakoshi, Kenichi*
Journal of Chemical Physics, 130(12), p.121101_1 - 121101_4, 2009/03
Times Cited Count：20 Percentile：57.3(Chemistry, Physical)In situ synchrotron X-ray diffraction measurements on tin tetraiodide, which consists of SnI tetrahedral molecules at ambient pressure, have been performed. It was established that the liquid forms existing above and below 1.5 GPa, where the slope of the melting curve of the solid phase changes abruptly, have different structures. This discovery offers evidence of thermodynamically stable polyamorphism in general compounds as well as in elements. A possible phase diagram that includes the two amorphous states already found is proposed based on the pseudobinary regular solution model. The vertex-to-face orientation between the nearest molecules plays a key role in the transition from the low-pressure to the high-pressure liquid phase.
Fuchizaki, Kazuhiro*; Nakamichi, Takeshi*; Saito, Hiroyuki; Katayama, Yoshinori
Solid State Communications, 148(9-10), p.390 - 394, 2008/09
Times Cited Count：26 Percentile：68.85(Physics, Condensed Matter)Diffraction data from hexagonal boron nitride were measured through in situ synchrotron X-ray measurements under pressures and temperatures up to about 8GPa and 1000K, respectively. They were analyzed in the light of Birch Murnaghan's and Parsafar Mason's equations of state. The isothermal bulk moduli at ambient conditions obtained from these equations almost coincide. However, the value, about 20GPa, is appreciably smaller than the one reported previously. The X-ray diffraction patterns by which the current result is justified are presented. The possible origin of a large discrepancy in the values is discussed.
Fuchizaki, Kazuhiro*; Fujii, Yasuhiko*; Oishi, Yasuo*; Omura, Ayako*; Hamaya, Nozomu*; Katayama, Yoshinori; Okada, Taku
Journal of Chemical Physics, 120(23), p.11196 - 11199, 2004/06
Times Cited Count：22 Percentile：58.16(Chemistry, Physical)The location of the liquidus in the low-pressure crystalline phase of SnI was determined utilizing 
X-ray diffraction measurements under pressures up to approximately 
GPa. The liquidus is not well fitted to a monotonically increasing curve such as Simon's equation, but breaks near 
GPa and then becomes almost flat. The results are compared to those from molecular dynamics simulations. Ways to improve the model potential adopted in the simulations are discussed.
phase in Cu
Al(+Pd) alloy under uniaxial pressure*; *; Morii, Yukio; ; Funahashi, Satoru
Mater. Trans. JIM, 33(3), p.203 - 207, 1992/03
Times Cited Count：17 Percentile：75.69(Materials Science, Multidisciplinary)no abstracts in English
*; *; *; *; *; *; *; Morii, Yukio; ; Funahashi, Satoru
JJAP Series, 7(7), p.59 - 67, 1992/00
no abstracts in English
CuO(CO)*; *; *; *; *; Morii, Yukio; ; Funahashi, Satoru; *
Physica C, 191, p.434 - 440, 1992/00
Times Cited Count：114 Percentile：97.08(Physics, Applied)no abstracts in English
-like diffraction anomaly in the premartensitic phase of AuCuZn alloy*; *; Morii, Yukio; ; Katano, Susumu; Funahashi, Satoru; H.R.Child*
Mater. Trans. JIM, 32(11), p.1011 - 1016, 1991/00
Times Cited Count：4 Percentile：47.83(Materials Science, Multidisciplinary)no abstracts in English
NiO
*; *; *; *; *; *; *; *; Morii, Yukio; ; et al.
Physica C, 185-189, p.579 - 580, 1991/00
Times Cited Count：16 Percentile：69.08(Physics, Applied)no abstracts in English
Fuchizaki, Kazuhiro*; Sakagami, Takahiro*; Miyauchi, Arata*; Hamaya, Nozomu*; Hattori, Takanori; Katayama, Yoshinori
no journal, ,
The results of the synchrotron X-ray diffraction on liquid SnI revealed the following characteristics on the phase transformation between low- and high-density liquids. (1) The local structure continuously changes with pressure. (2) The density shows no systematic change with pressure. The first one is confirmed by the continous pressure-induced change of off-tetragonalinity in the local structure. On the other hand, the second statement is still less convincible because it based on the indirect method to measure liquid density. To confirm the second statement, the direct measurement of the liquid density is necessary. For that purpose, we determined density from X-ray absorption of liquid sample. The results showed that the liquid density slightly jumps by the amount of 0.3 g/cc at 1.5 GPa, where the PT-melting curve shows a knick. Now we are trying to reveal the details based on more accurate data.
