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Journal Articles

Improvement of nano-polycrystalline diamond anvil cells with Zr-based bulk metallic glass cylinder for higher pressures; Application to Laue-TOF diffractometer

Yamashita, Keishiro*; Komatsu, Kazuki*; Ohara, Takashi; Munakata, Koji*; Irifune, Tetsuo*; Shimmei, Toru*; Sugiyama, Kazumasa*; Kawamata, Toru*; Kagi, Hiroyuki*

High Pressure Research, 42(1), p.121 - 135, 2022/03

Journal Articles

Practical effects of pressure-transmitting media on neutron diffraction experiments using Paris-Edinburgh presses

Hattori, Takanori; Sano, Asami; Machida, Shinichi*; Ouchi, Keiichi*; Kira, Hiroshi*; Abe, Jun*; Funakoshi, Kenichi*

High Pressure Research, 40(3), p.325 - 338, 2020/09

 Times Cited Count:1 Percentile:32.18(Physics, Multidisciplinary)

To understand the practical effects of pressure-transmitting media (PTM) on neutron diffraction using Paris-Edinburgh presses, diffraction patterns of MgO were collected to approximately 20 GPa using PTMs of Pb, AgCl, 4:1 methano-ethanol (ME) mixture with and without heating, N$$_2$$, and Ar. Hydrostaticity in the sample chamber estimated from the MgO 220 peak width improves in the order of Pb, AgCl, Ar, ME mixture, N$$_2$$, and the heated ME mixture. Unlike previous results using a diamond anvil cell, the unheated ME mixture is superior to Ar even after freezing, probably due to the cup on the anvil face. Considering these results and the sizable coherent scattering of Ne, which would show good hydrostaticity, we conclude that the ME mixture (preferably the heated one) is the best PTM in neutron experiments up to 20 GPa, while Ar can be substituted when a sample is reactive to alcohols.

Journal Articles

Developments of nano-polycrystalline diamond anvil cells for neutron diffraction experiments

Komatsu, Kazuki*; Klotz, S.*; Nakano, Satoshi*; Machida, Shinichi*; Hattori, Takanori; Sano, Asami; Yamashita, Keishiro*; Irifune, Tetsuo*

High Pressure Research, 40(1), p.184 - 193, 2020/02

 Times Cited Count:3 Percentile:63.95(Physics, Multidisciplinary)

A new high pressure cells for neutron diffraction experiments using nano-polycrystalline anvil is presented. The cell design, off-line pressure generation tests and a gas-loading procedure for this cell are described. The performance is illustrated by powder neutron diffraction patterns of ice VII to $$sim$$ 82 GPa. We also demonstrate the feasibility of single crystal neutron diffraction experiments of Fe$$_{3}$$O$$_{4}$$ at ambient conditions using this cell and discuss the current limitation and future developments.

Journal Articles

Development of a technique for high pressure neutron diffraction at 40 GPa with a Paris-Edinburgh press

Hattori, Takanori; Sano, Asami; Machida, Shinichi*; Abe, Jun*; Funakoshi, Kenichi*; Arima, Hiroshi*; Okazaki, Nobuo*

High Pressure Research, 39(3), p.417 - 425, 2019/06


 Times Cited Count:9 Percentile:77.94(Physics, Multidisciplinary)

We have developed a technique for neutron diffraction experiments at pressures up to 40 GPa using a Paris-Edinburgh press at the PLANET beamline in J-PARC. To increase the maximum accessible pressure, the diameter of the dimple for sample chamber at the top of the sintered diamond anvils is sequentially reduced from 4.0 mm to 1.0 mm. As a result, the maximum pressure increased and finally reached 40 GPa. By combining this technique with the beam optics which defines the gauge volume, diffraction patterns sufficient for full-structure refinements are obtainable at such pressures.

Journal Articles

Energy-dispersive X-ray diffraction study of liquid gallium under high pressure at elevated temperatures

Yagafarov, O.; Katayama, Yoshinori; Brazhkin, V. V.*; Lyapin, A. G.*; Saito, Hiroyuki

High Pressure Research, 33(1), p.191 - 195, 2013/01

 Times Cited Count:5 Percentile:42.54(Physics, Multidisciplinary)

Journal Articles

High pressure and high temperature generation using small-sized cubic-type multi-anvil apparatus

Saito, Hiroyuki; Abe, Jun

High Pressure Research, 31(3), p.407 - 412, 2011/09

 Times Cited Count:0 Percentile:0(Physics, Multidisciplinary)

Journal Articles

Thermodynamic study on non-centrosymmetric superconductor UIr by ac calorimetry under high pressure

Tateiwa, Naoyuki; Haga, Yoshinori; Matsuda, Tatsuma; Yamamoto, Etsuji; Ikeda, Shugo; Onuki, Yoshichika*

High Pressure Research, 26(4), p.471 - 474, 2006/12

 Times Cited Count:0 Percentile:0(Physics, Multidisciplinary)

We investigated non-centrosymmetric compounds CePt$$_3$$Si and UIr by the ac heat capacity measurement under pressures. The pressure phase diagrams are determined. In CePt$$_3$$Si, the N$'e$el temperature $$T_{rm N}$$ = 2.2 K decreases with increasing pressure and becomes zero at the critical pressure $$P_{rm AF}$$ $$simeq$$ 0.6 GPa. On the other hand, the superconducting phase exists in a wider pressure region from ambient pressure to about 1.5 GPa. The phase diagram of CePt$$_3$$Si is thus very unique. In the ferromagnetic compound UIr where successive ferromagnetic transitions appear under pressure, the heat capacity shows an anomaly at the Curie temperature $$T_{rm C1}$$ and this anomaly shifts to lower temperatures with increasing pressure. The present pressure dependence of $$T_{rm C1}$$ was consistent with the previous works by the resistivity and magnetization measurements.

Journal Articles

Electrical and structural properties of YH$$_{x}$$(${it x}$ $$sim$$3) under high pressure

Matsuoka, Takehiro*; Kitayama, Takayasu*; Shimizu, Katsuya*; Nakamoto, Yuki*; Kagayama, Tomoko*; Aoki, Katsutoshi; Oishi, Yasuo*; Takemura, Kenichi*

High Pressure Research, 26(4), p.391 - 394, 2006/12

 Times Cited Count:1 Percentile:11.54(Physics, Multidisciplinary)

The electrical and structural properties of yttrium hydride YHx was studied by the in-situ measurements of the electrical resistance and X-ray diffraction up to 86 GPa. The electrical resistivity increased with applying pressure up to 10 GPa and showed a maximum which accompanied with the structural transition of metal lattice from hcp to fcc structure. In fcc phase the resistivity decreased significantly, however the value still remained larger by 4 orders of magnitude that that of pure yttrium metal. We could not confirm the insulator to metal transition up to 23 GPa. The resistivity showed another maximum in the large pressure region 40 $$sim$$ 60 GPa without the structural phase transition of metal lattice.

Journal Articles

Anharmonicity of platinum under HP and HT

Okube, Maki*; Yoshiasa, Akira*; Otaka, Osamu*; Katayama, Yoshinori

High Pressure Research, 23(3), p.247 - 251, 2003/09

 Times Cited Count:4 Percentile:35.06(Physics, Multidisciplinary)

In order to examine the pressure effect on anharmonic thermal vibrations of Pt, Extended X-ray Absorption Fine Structure (EXAFS) spectra near Pt K-edge and L$$_{3}$$-edge were measured in the temperature range from 300 to 800K under pressures up to 6vGPa, using large volume high-pressure devices and synchrotron radiation. We have investigated the anharmonic interatomic potentials by a cumulant expansion method. The values of EXAFS Debye-Waller factors, $$sigma$$2 and $$sigma$$3, become smaller with increase of pressure. The anharmonic effective pair potential $$V(u) = (1/2!)au^{2} + (1/3!)bu^{3}$$ was evaluated and the potential coefficient a at 0.1MPa and 6GPa are 4.8 and 5.0eV/$AA $^{2}$$, respectively. The anharmonic potential parameter $$b$$ decreases with increasing pressure.

Journal Articles

Phase relation and EOS of ZrO$$_{2}$$ and HfO$$_{2}$$ under high-temperature and high-pressure

Otaka, Osamu*; Fukui, Hiroyuki*; Funakoshi, Kenichi*; Utsumi, Wataru; Irifune, Tetsuo*; Kikegawa, Takumi*

High Pressure Research, 22(1), p.221 - 226, 2002/01

 Times Cited Count:23 Percentile:72.9(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

High-pressure phase relationships for FeS

Urakawa, Satoru*; Hasegawa, Masayuki*; Yamakawa, Junji*; Funakoshi, Kenichi*; Utsumi, Wataru

High Pressure Research, 22(2), p.491 - 494, 2002/01

 Times Cited Count:3 Percentile:29.83(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Pressure-induced structure change of molten KCl

Urakawa, Satoru*; Igawa, Naoki; Umesaki, Norimasa*; Igarashi, Kazuo*; Shimomura, Osamu*; Ono, Hideo

High Pressure Research, 14(4-6), p.375 - 382, 1996/12

 Times Cited Count:6 Percentile:53.84(Physics, Multidisciplinary)

no abstracts in English

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