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Journal Articles

Precise structural analyses of advanced materials under high-pressure and high-temperature

Yoshiasa, Akira*; Murai, Keiichiro*; Arima, Hiroshi*; Katayama, Yoshinori

International Journal of Modern Physics B, 25(31), p.4159 - 4162, 2011/12

 Times Cited Count:0 Percentile:0.01(Physics, Applied)

Precise structure analyses of advanced materials under pressure were performed using each advantage of X-ray absorption fine structure (XAFS) and diffraction methods. Measurements were performed in-situ under pressure and temperature using a large-volume multi-anvil pressure apparatus and synchrotron radiation. XAFS spectra are useful for phase study under high temperature and high pressure. The XAFS Debye-Waller factor provides anharmonic effective pair potential with a pressure-dependent and temperature-independent shape. The phonon energies and anharmonicity are affected largely by the change in local structure and bonding character.

Journal Articles

XAFS study of GeO$$_{2}$$ glass under pressure

Otaka, Osamu*; Yoshiasa, Akira*; Fukui, Hiroyuki*; Murai, Keiichiro*; Okube, Maki*; Takebe, Hitoshi*; Katayama, Yoshinori; Utsumi, Wataru

Journal of Physics; Condensed Matter, 14(44), p.10521 - 10524, 2002/11

 Times Cited Count:17 Percentile:63.92(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Pressure dependence of effective pair potentials in AgBr determined by extended X-ray absorption fine structure

Yoshiasa, Akira*; Murai, Keiichiro*; Nagai, Takaya*; Katayama, Yoshinori

Japanese Journal of Applied Physics, Part 1, 40(4A), p.2395 - 2398, 2001/04

 Times Cited Count:5 Percentile:27.09(Physics, Applied)

The pressure dependence of extended X-ray absorption fine structure (EXAFS) Debye-Waller factors in AgBr has been investigated using the cumulant expansion method. The Br K-edge EXAFS spectra were measured in the transmission mode under high pressure ($$leq$$9.1GPa) at room temperature using a cubic anvil type apparatus (MAX90) and synchrotron radiation from the Photon Factory, Tsukuba. The effective pair potentials $$V(u)=au^{2}/2+bu^{3}/3!$$, were evaluated and the potential coefficient $$a$$ at 2.1, 4.2 and 6.1GPa are 1.59(4), 1.75(4) and 1.91(4) eV/$$AA^{-2}$$, respectively. The energies of the third-order anharmonic potential coefficient $$b$$ maintain nearly constant values with pressure though the third-order cumulant $$sigma_{3}$$ decreases with increasing in pressure.

Journal Articles

Structual changes of quartz-type crystalline and vitreous GeO$$_{2}$$ under pressure

Otaka, Osamu*; Yoshiasa, Akira*; Fukui, Hiroyuki*; Murai, Keiichiro*; Okube, Maki*; Katayama, Yoshinori; Utsumi, Wataru; Nishihata, Yasuo

Journal of Synchrotron Radiation, 8(Part2), p.791 - 793, 2001/03

no abstracts in English

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