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Journal Articles

Recrystallization of bulk nanostructured magnesium alloy AZ31 after severe plastic deformation; An in situ diffraction study

Liss, K.-D.*; Han, J.-K.*; Blankenburg, M.*; Lienert, U.*; Harjo, S.; Kawasaki, Takuro; Xu, P. G.; Yukutake, Eitaro*; Kawasaki, M.*

Journal of Materials Science, 23 Pages, 2024/00

https://doi.org/10.1007/s10853-023-09250-4

Times Cited Count：0 Percentile：0.01(Materials Science, Multidisciplinary)

Journal Articles

Origin of magnetovolume effect in a cobaltite

Miao, P.*; Tan, Z.*; Lee, S. H.*; Ishikawa, Yoshihisa*; Torii, Shuki*; Yonemura, Masao*; Koda, Akihiro*; Komatsu, Kazuki*; Machida, Shinichi*; Sano, Asami; et al.

Physical Review B, 103(9), p.094302_1 - 094302_18, 2021/03

https://doi.org/10.1103/PhysRevB.103.094302

Times Cited Count：2 Percentile：17.84(Materials Science, Multidisciplinary)

The layered perovskite PrBaCo $_{2}$ O $_{5.5}$ demonstrates a strong negative thermal expansion (NTE) which holds potential for being fabricated into composites with zero thermal expansion. The NTE was found to be intimately associated with the spontaneous magnetic ordering, known as magneto-volume effect (MVE). Here we report with compelling evidences that the continuous-like MVE in PrBaCo $_{2}$ O $_{5.5}$ is intrinsically of discontinuous character, originating from an magnetoelectric transition from an antiferromagnetic insulating large-volume (AFILV) phase to a ferromagnetic less-insulating small-volume (FLISV) phase. Furthermore, the magnetoelectric effect (ME) shows high sensitivity to multiple external stimuli such as temperature, carrier doping, hydrostatic pressure, magnetic field etc. In contrast to the well-known ME such as colossal magnetoresistance and multi-ferroic effect which involve symmetry breaking of crystal structure, the ME in the cobaltite is purely isostructural. Our discovery provides a new path way to realizing the ME as well as the NTE, which may find applications in new techniques.

Journal Articles

Thermal expansion measurement of (U,Pu)O $_{2-x}$ in oxygen partial pressure-controlled atmosphere

Kato, Masato; Ikusawa, Yoshihisa; Sunaoshi, Takeo*; Nelson, A. T.*; McClellan, K. J.*

Journal of Nuclear Materials, 469, p.223 - 227, 2016/02

https://doi.org/10.1016/j.jnucmat.2015.11.048

Times Cited Count：11 Percentile：71.62(Materials Science, Multidisciplinary)

Thermal expansion of (U $_{0.7}$ Pu $_{0.3}$ )O $_{2-x}$ (x = 0, 0.01, 0.02, 0.03) and (U $_{0.52}$ Pu $_{0.48}$ )O $_{2.00}$ was measured with a dilatometer in an oxygen partial pressure-controlled atmosphere. The oxygen partial pressure was controlled to hold a constant oxygen-to-metal ratio in the (U,Pu)O $_{2-x}$ during the measurement. Thermal expansion slightly increased with the decrease in oxygen-to-metal ratio. The relationship was derived to describe thermal expansion.

Journal Articles

Magnetoelastic coupling in the spin-dimer system TlCuCl

Johannsen, N.*; Vasiliev, A.*; Osawa, Akira; Tanaka, Hidekazu*; Lorenz, T.*

Physical Review Letters, 95(1), p.017205_1 - 017205_4, 2005/07

https://doi.org/10.1103/PhysRevLett.95.017205

Times Cited Count：23 Percentile：71.33(Physics, Multidisciplinary)

We present high-resolution measurements of the thermal expansion and the magnetostriction of TlCuCl $_{3}$ which shows field-induced antiferromagnetic order. We find pronounced anomalies in the field and temperature dependence of different directions of the lattice signaling a large magnetoelastic coupling. The phase boundary is extremely sensitive to pressure, e.g. the transition field would change by about 185%/GPa under uniaxial pressure applied along certain directions. This drastic effect can unambiguously be traced back to changes of the intradimer coupling under uniaxial pressure. The interdimer couplings remain essentially unchanged under pressure, but strongly change when Tl is replaced by K.

Journal Articles

Field-induced magnetic order and simultaneous lattice deformation in TlCuCl

Vyaselev, O.*; Takigawa, Masashi*; Vasiliev, A.*; Osawa, Akira; Tanaka, Hidekazu*

Physical Review Letters, 92(20), p.207202_1 - 207202_4, 2004/05

https://doi.org/10.1103/PhysRevLett.92.207202

Times Cited Count：37 Percentile：79.57(Physics, Multidisciplinary)

We report the results of Cu and Cl nuclear magnetic resonance experiments and thermal expansion measurements in magnetic fields in the coupled dimer spin system TlCuCl. We found that the field-induced antiferromagnetic transition as confirmed by the splitting of NMR lines is slightly discontinuous. The abrupt change of the electric field gradient at the Cl sites, as well as the sizable change of the lattice constants, across the phase boundary indicate that the magnetic order is accompanied by simultaneous lattice deformation. These results suggest the importance of the spin-lattice correlations in this system.

Journal Articles

Phase study and thermal expansion of yttria stabilized zirconia doped with PuO $_{2-x}$

Yamashita, Toshiyuki; Yamazaki, Satoshi*; Sato, Tsuyoshi*; Matsui, Tsuneo*

Journal of Nuclear Science and Technology, 39(Suppl.3), p.656 - 659, 2002/11

http://www.tandfonline.com/doi/abs/10.1080/00223131.2002.10875554

no abstracts in English

Journal Articles

Coefficient of thermal expansion

Oku, Tatsuo*; Baba, Shinichi

Tanso, 2002(202), p.90 - 95, 2002/05

https://doi.org/10.7209/tanso.2002.90

no abstracts in English

Journal Articles

Thermal expansions of technetium-ruthenium alloys

Shirasu, Yoshiro; Minato, Kazuo

Journal of Alloys and Compounds, 335(1-2), p.224 - 227, 2002/03

https://doi.org/10.1016/S0925-8388(01)01806-0

Times Cited Count：7 Percentile：47.03(Chemistry, Physical)

no abstracts in English

Journal Articles

Anharmonicity of gold under high-pressure and high-temperature

Okube, Maki*; Yoshiasa, Akira*; Otaka, Osamu*; Fukui, Hiroshi*; Katayama, Yoshinori; Utsumi, Wataru

Solid State Communications, 121(5), p.235 - 239, 2002/02

https://doi.org/10.1016/S0038-1098(01)00494-X

Times Cited Count：11 Percentile：50.72(Physics, Condensed Matter)

In order to examine the pressure effect on the anharmonicity of Au, EXAFS spectra near Au $L_{3}$ -edge were measured at the temperature range from 300 to 1000K under pressure up to 14GPa using large volume high-pressure devices and synchrotron radiation. The values of EXAFS Debye-Waller factors, and , become smaller with increase of pressure, which indicates that the potential width become narrower with pressure. The anharmonic effective pair potentials of Au, $V(u)=au^{2}/2!+bu^{3}/3!$ , at 0.1MPa, 6 and 14GPa have been calculated. The pressure dependence of the coefficient of thermal expansion has also been evaluated.

Journal Articles

Distribution of internal stress by a shink-fit for the aluminum ring and plug

Minakawa, Nobuaki; Morii, Yukio; Moriai, Atsushi; Otomo, Akitoshi; Kikuchi, Kenji

Journal of the Physical Society of Japan, Vol.70, Supplement A, p.517 - 519, 2001/05

no abstracts in English

Journal Articles

Fracture mechanics evaluation of a crack generated in SiC/SiC composite first wall

Kurihara, Ryoichi; Ueda, Shuzo; Nishio, Satoshi; Seki, Yasushi

Fusion Engineering and Design, 54(3-4), p.465 - 471, 2001/04

https://doi.org/10.1016/S0920-3796(00)00567-6

Times Cited Count：10 Percentile：59.01(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Thermal expansion of (Ca $_{1-x}$ Pu $_{x}$ )TiO $_{3}$

Sato, Tsuyoshi*; Hanajiri, Yutaka*; Yamashita, Toshiyuki; Matsui, Tsuneo*; Nagasaki, Takanori*

Journal of Nuclear Materials, 294(1-2), p.130 - 134, 2001/04

https://doi.org/10.1016/S0022-3115(01)00472-X

Times Cited Count：7 Percentile：48.68(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Thermal expansion and solubility limits of plutonium-doped lanthanum zirconates

Yamazaki, Satoshi*; Yamashita, Toshiyuki; Matsui, Tsuneo*; Nagasaki, Takanori*

Journal of Nuclear Materials, 294(1-2), p.183 - 187, 2001/04

https://doi.org/10.1016/S0022-3115(01)00464-0

Times Cited Count：42 Percentile：92.7(Materials Science, Multidisciplinary)

no abstracts in English

JAEA Reports

An Irradiation test of heat-resistant ceramic composite materials; Interim report on post-irradiation examinations of the first preliminary irradiation test 97M-13A

Baba, Shinichi; Suzuki, Yoshio*; Takahashi, Tsuneo*; Ishihara, Masahiro; Hayashi, Kimio; Saito, Tamotsu; Sozawa, Shizuo; Saito, Takashi; Sekino, Hajime

JAERI-Research 2001-028, 109 Pages, 2001/03

JAERI-Research-2001-028.pdf:4.55MB

no abstracts in English

JAEA Reports

Design and installation of high-temperature X-ray diffractometer for transuranium elements and its performance test (Joint research)

Arai, Yasuo; Nakajima, Kunihisa; Serizawa, Hiroyuki; ; Suzuki, Yasufumi; Inoue, Tadashi*

JAERI-Tech 98-022, 21 Pages, 1998/06

JAERI-Tech-98-022.pdf:1.07MB

no abstracts in English

JAEA Reports

Development of fabrication method for thermal expansion difference irradiation temperature monitor

; *; Miyakawa, Shunichi; *;

PNC TN9410 98-035, 60 Pages, 1998/03

PNC-TN9410-98-035.pdf:2.46MB

This report describes the development activities for the fabrication of the Thermal Expansion Difference irradiation temperature monitor (TED) at the Oarai Engineering Center (OEC)/PNC. TED is used for various irradiation tests in the experimental fast reactor JOYO. TED is the most accurate off-line temperature monitor used for irradiation examination. The TED is composed of a metallic sphere lid and either a stainless steel or nickel alloy container. Once the container is filled with sodium, the metallic sphere lid is sealed by using a resistance weld. This capsule is then loaded into a reactor. Once a TED is loaded into the JOYO reactor, the sodium inside the metallic container increases as a result of thermal expansion. The TED identifies the peak irradiation temperature of the reactor based on a formula correlating temperature to increment values. This formula is established specifically for the particular TED being used during a calibration process performed when the TED is fabricated. Initially the TED was developed by Argonne National Laboratory (ANL) in the United States, and was imported by PNC for use in the JOYO reactor. In 1992 PNC decided to fabricate TED domestically in order to ensure the stability of future supplies. Based on technical information provided by ANL, PNC began fabrication of a TED on an experimental basis. In addition, PNC endeavored to make the domestically produced TED more efficient. This involved improving the techniques used in the sodium filling and the metallic sphere welding processes. These quality control efforts led to PNC's development of processes enabling the capsules to be filled with sodium to nearly 100%. As a result, the accuracy of the temperature dispersion in the out-pile calibration test was improved from 10 $^{circ}$ C to 5 $^{circ}$ . In 1996 the new domestically fabricated TED was attached to a JOYO irradiation rig. In March of 1997, irradiation of the rig was started on the 30th duty cycle operation, .