JAEA
  • help
  • PC | SP
  • JP | EN
          
Refine your search：     
Report No.
 - 
Clear All
Search Results: Records 1-20 displayed on this page of 3133

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

Journal Articles

Microstructural evolution and mechanical instability of Mar-M509 superalloy fabricated by laser powder bed fusion under short-term thermal exposure

Cao, T.*; Wei, D.*; Gong, W.; Kawasaki, Takuro; Harjo, S.; 10 of others*

Materials Science and Engineering A, 940, p.148534_1 - 148534_16, 2025/09

https://doi.org/10.1016/j.msea.2025.148534

Journal Articles

Enhanced work hardening in ferrite and austenite of duplex stainless steel at 200 K; ${it In situ}$ neutron diffraction study

Yamashita, Takayuki*; Koga, Norimitsu*; Mao, W.*; Gong, W.; Kawasaki, Takuro; Harjo, S.; Fujii, Hidetoshi*; Umezawa, Osamu*

Materials Science and Engineering A, 941, p.148602_1 - 148602_11, 2025/09

https://doi.org/10.1016/j.msea.2025.148602
 Times Cited Count：0

Journal Articles

Temperature-dependent deformation behavior of dual-phase medium-entropy alloy; In-situ neutron diffraction study

Gu, G. H.*; Jeong, S. G.*; Heo, Y.-U.*; Harjo, S.; Gong, W.; Cho, J.*; Kim, H. S.*; 4 of others*

Journal of Materials Science & Technology, 223, p.308 - 324, 2025/07

https://doi.org/10.1016/j.jmst.2024.11.057
 Times Cited Count：0 Percentile：0.00(Materials Science, Multidisciplinary)

Journal Articles

Unique deformation behavior of ultrafine-grained 304 stainless steel at 20 K

Mao, W.*; Gong, W.; Kawasaki, Takuro; Gao, S.*; Ito, Tatsuya; Yamashita, Takayuki*; Harjo, S.; Zhao, L.*; Wang, Q.*

Scripta Materialia, 264, p.116726_1 - 116726_6, 2025/07

https://doi.org/10.1016/j.scriptamat.2025.116726
 Times Cited Count：0 Percentile：0.00(Nanoscience & Nanotechnology)

Journal Articles

Grain refinement of dual phase steel maximizes deformation ability of martensite, leading to simultaneous enhancement of strength and ductility

Park, M.-H.*; Shibata, Akinobu*; Harjo, S.; Tsuji, Nobuhiro*

Acta Materialia, 292, p.121061_1 - 121061_13, 2025/06

https://doi.org/10.1016/j.actamat.2025.121061
 Times Cited Count：1 Percentile：84.88(Materials Science, Multidisciplinary)

Journal Articles

Pressure-induced elongation of hydrogen-oxygen bond in sodium silicate melts

Ohashi, Tomonori*; Sakamaki, Tatsuya*; Funakoshi, Kenichi*; Steinle-Neumann, G.*; Hattori, Takanori; Yuan, L.*; Suzuki, Akio*

Journal of Mineralogical and Petrological Sciences (Internet), 120(1), p.240926a_1 - 240926a_13, 2025/06

https://doi.org/10.2465/jmps.240926a

We explore the structures of dry and hydrated (H$$_2$$O and D$$_2$$O) Na$$_6$$Si$$_8$$O$$_{19}$$ melt at 0-6 GPa and 1000-1300 K and glasses recovered from high pressure and temperatures by in-situ neutron and X-ray diffraction. The structures of the melts at 0-10 GPa and 3000 K are also investigated by ab-initio molecular dynamics simulation. In-situ neutron experiments revealed that the D-O distance increases with compression due to the formation of -O-D-O- bridging species, which is reproduced by the molecular dynamics simulations. The pressure-induced -O-D-O- formation reflects a more rigid incorporation of hydrogen, which acts as a mechanism for the experimentally observed higher solubility of water in silicate melts. Together with shrinking modifier domains, this process dominates the compression behavior of hydrous Na$$_6$$Si$$_8$$O$$_{19}$$ melt, whereas the compression of dry Na$$_6$$Si$$_8$$O$$_{19}$$ at 0-10 GPa and 3000 K is governed largely by bending of the Si-O-Si angle. The molecular dynamics simulations on hydrous Na$$_6$$Si$$_8$$O$$_{19}$$ melts further suggest that the sodium ions are scavenged from its network-modifying role via 2($$^{[4]}$$Si-O$$^-$$ + Na$$^+$$) $$rightarrow$$ $$^{[4]}$$Si-(O-$$^{[5]}$$Si-O)$$^{2-}$$ + 2Na$$^+$$ and Si-O$$^-$$ + Na$$^+$$ + Si-OH $$rightarrow$$ Si-(O-H-O-Si)$$^-$$ + Na$$^+$$ with increasing pressure.

Journal Articles

Neutron diffraction study of the crystal and magnetic structures of antiferromagnetic manganese deuteride at high temperatures and high pressures

Machida, Akihiko*; Saito, Hiroyuki*; Aoki, Katsutoshi*; Komatsu, Kazuki*; Hattori, Takanori; Sano, Asami; Funakoshi, Kenichi*; Machida, Shinichi*; Sato, Toyoto*; Orimo, Shinichi*

Physical Review B, 111(22), p.224413_1 - 224413_6, 2025/06

https://doi.org/10.1103/yf8k-cy61
 Times Cited Count：1

The crystal and magnetic structures of antiferromagnetic Mn deuterides formed by hydrogenating Mn metal at high temperature and high pressure, fcc $$gamma$$-MnDx and hcp $$epsilon$$-MnDx, were investigated by in-situ neutron powder diffraction. Deuterium atoms partially occupied the octahedral interstitial positions of the fcc and hcp metal lattices. The site occupancies increased rapidly with decreasing temperature from $$sim$$700 to $$sim$$450 K and remained down to 300 K. N$'{e}$el temperature of 543(10) K was determined for $$gamma$$-MnD$$_{0.34}$$. For $$epsilon$$-MnD$$_{0.62}$$, saturation magnetic moment and N$'{e}$el temperature were determined to be 0.82(1) $$mu_B$$ and 347(3) K, respectively. The N$'{e}$el temperatures determined for $$gamma$$-MnD$$_{0.34}$$ and $$epsilon$$-MnD$$_{0.62}$$ are consistent with those predicted by the respective Slater-Pauling curves proposed in previous studies. The updated N$'{e}$el temperatures provide insights into the development of more accurate Slater-Pauling curves based on electronic band structure calculations.

Journal Articles

Experimental investigation of phase transformations in steel using X-ray and neutron diffraction

Tomota, Yo*; Harjo, S.; Xu, P. G.; Morooka, Satoshi; Gong, W.; Wang, Y.*

Metals, 15(6), p.610_1 - 610_19, 2025/05

https://doi.org/10.3390/met15060610
 Times Cited Count：0

Journal Articles

Synthesis of BaSiH$$_6$$ hydridosilicate at high pressures; A Bridge to BaSiH$$_8$$ polyhydride

Beyer, D. C.*; Spektor, K.*; Vekilova, O. Y.*; Grins, J.*; Barros Brant Carvalho, P. H.*; Leinbach, L. J.*; Sannemo-Targama, M.*; Bhat, S.*; Baran, V.*; Etter, M.*; et al.

ACS Omega (Internet), 10(15), p.15029 - 15035, 2025/04

https://doi.org/10.1021/acsomega.4c10502
 Times Cited Count：0 Percentile：0.00(Chemistry, Multidisciplinary)

Hydridosilicates featuring SiH$$_6$$ octahedral moieties represent a rather new class of compounds with potential properties relating to hydrogen storage and hydride ion conductivity. Here, we report on the new representative BaSiH$$_6$$ obtained from reacting the Zintl phase hydride BaSiH$$_{sim 1.8}$$ with H$$_2$$ fluid at pressures above 4 GPa and subsequent decompression to ambient pressure. It consists of complex SiH$$_{6}^{2-}$$ ions, which are octahedrally coordinated by Ba$$^{2+}$$ counterions. The arrangement of Ba and Si atoms deviates only slightly from an ideal fcc NaCl structure. IR and Raman spectroscopy showed SiH$$_{6}^{2-}$$ bending and stretching modes in the ranges 800-1200 and 1400-1800 cm$$^{-1}$$, respectively. BaSiH$$_6$$ is thermally stable up to 95$$^circ$$C above which decomposition into BaH$$_2$$ and Si takes place. DFT calculations indicated a direct band gap of 2.5 eV. The discovery of BaSiH$$_6$$ consolidates the compound class of hydridosilicates, accessible from hydrogenations of silicides at gigapascal pressures ($$textless$$10 GPa). The structural properties of BaSiH$$_6$$ suggest that it presents an intermediate (or precursor) for further hydrogenation at considerably higher pressures to the predicted superconducting polyhydride BaSiH$$_8$$.

Journal Articles

Role of solute hydrogen on mechanical property enhancement in Fe-24Cr-19Ni austenitic steel; An ${it in situ}$ neutron diffraction study

Ito, Tatsuya; Ogawa, Yuhei*; Gong, W.; Mao, W.*; Kawasaki, Takuro; Okada, Kazuho*; Shibata, Akinobu*; Harjo, S.

Acta Materialia, 287, p.120767_1 - 120767_16, 2025/04

https://doi.org/10.1016/j.actamat.2025.120767
 Times Cited Count：1 Percentile：0.00(Materials Science, Multidisciplinary)

Journal Articles

On the role of austenite stability in yielding behavior of a medium Mn steel with a duplex austenite-martensite microstructure

Wang, Y.*; Gong, W.; Harjo, S.; 7 of others*

Acta Materialia, 288, p.120840_1 - 120840_14, 2025/04

https://doi.org/10.1016/j.actamat.2025.120840
 Times Cited Count：3 Percentile：84.88(Materials Science, Multidisciplinary)

Journal Articles

Enhanced strength and ductility in an additively manufactured Al10SiMg alloy at cryogenic temperatures

Naeem, M.*; Rehman, A. U.*; Romero Resendiz, L.*; Salamci, E.*; Aydin, H.*; Ansari, P.*; Harjo, S.; Gong, W.; Wang, X.-L.*; 3 of others*

Communications Materials (Internet), 6, p.65_1 - 65_13, 2025/04

https://doi.org/10.1038/s43246-025-00793-4

Journal Articles

None

Kumada, Takayuki; Iwahara, Daisuke*

Isotope News, (798), p.26 - 27, 2025/04

no abstracts in English

Journal Articles

In situ neutron diffraction study of strain evolution and load partitioning during elevated temperature tensile test in HIP-Treated electron beam powder bed fusion manufactured Ti-6Al-4V

Pandian, K.*; Neikter, M.*; Ekh, M.*; Harjo, S.; Kawasaki, Takuro; Woracek, R.*; Hansson, T.*; Pederson, R.*

JOM, 77(4), p.1803 - 1815, 2025/04

https://doi.org/10.1007/s11837-025-07128-1
 Times Cited Count：0 Percentile：0.00(Materials Science, Multidisciplinary)

Journal Articles

Residual stress measurement and lifetime evaluation of railway axles by neutron scattering technology

Hu, F.-F.*; Qin, T.-Y.*; Ao, N.*; Xu, P. G.; Su, Y. H.; Parker, J. D.*; Shinohara, Takenao; Shobu, Takahisa; Kang, G.-Z.*; Ren, M.-M.; et al.

Journal of Traffic and Transportation Engineering, 25(2), p.75 - 93, 2025/04

https://dx.doi.org/10.19818/j.cnki.1671-1637.2025.02.005
https://transport.chd.edu.cn/en/article/doi/10.19818/j.cnki.1671-1637.2025.02.005
https://transport.chd.edu.cn/cn/article/doi/10.19818/j.cnki.1671-1637.2025.02.005

Journal Articles

Ordered graphane nanoribbons synthesized via high-pressure diels-alder polymerization of 2,2'-bipyrazine

Li, F.*; Tang, X.*; Fei, Y.*; Zhang, J.*; Liu, J.*; Lang, P.*; Che, G.*; Zhao, Z.*; Zheng, Y.*; Fang, Y.*; et al.

Journal of the American Chemical Society, 147(17), p.14054 - 14059, 2025/04

https://doi.org/10.1021/jacs.5c03116
 Times Cited Count：1 Percentile：0.00(Chemistry, Multidisciplinary)

We synthesized a crystalline graphane nanoribbon (GANR) via pressure-induced polymerization of 2,2'-bipyrazine (BPZ). By performing Rietveld refinement of in situ neutron diffraction data, nuclear magnetic resonance spectroscopy, infrared spectra, and theoretical calculation, we found that BPZ experienced Diels-Alder polymerization between the $$pi$$ $$cdots$$ $$pi$$ stacked aromatic rings, and formed extended boat-GANR structures with exceptional long-range order. The unreacted -C=N- groups bridge the two ends of the boat, and ready for further functionalization. The GANR has a bandgap of 2.25 eV, with booming photoelectric response ($$I_{rm on}$$/$$I_{rm off}$$ =18.8). Our work highlights that the high-pressure topochemical polymerization is a promising method for the precise synthesis of graphane with specific structure and desired properties.

Journal Articles

Neutron spectroscopy study on crystalline electric field excitations in NdB$$_4$$

Yamauchi, Hiroki; Metoki, Naoto; Watanuki, Ryuta*; Hong, T.*; Fernandez-Baca, J. A.*; Hagihara, Masato; Masuda, Takatsugu*; Yoshizawa, Hideki*; Ito, Shinichi*

Journal of the Physical Society of Japan, 94(5), p.054705_1 - 054705_8, 2025/04

https://doi.org/10.7566/JPSJ.94.054705

Journal Articles

Gapless dispersive continuum in a modulated quantum kagome antiferromagnet

Thennakoon, A.*; Yokokura, Ryoga*; Yang, Y.*; Kajimoto, Ryoichi; Nakamura, Mitsutaka; Hayashi, Masahiro*; Michioka, Chishiro*; Chern, G.-W.*; Broholm, C.*; Ueda, Hiroaki*; et al.

Nature Communications (Internet), 16, p.3939_1 - 3939_13, 2025/04

https://doi.org/10.1038/s41467-025-58971-4
 Times Cited Count：0 Percentile：0.00(Multidisciplinary Sciences)

Journal Articles

Crystal structures of ReO$$_3$$ under hydrostatic pressure; A Combined neutron, X-ray, Raman, and first-principles calculation study

Efthimiopoulos, I.*; Klotz, S.*; Kunc, K.*; Baptiste, B.*; Chauvigne, P.*; Hattori, Takanori

Physical Review B, 111(13), p.134103_1 - 134103_13, 2025/04

https://doi.org/10.1103/PhysRevB.111.134103
 Times Cited Count：0 Percentile：0.00(Materials Science, Multidisciplinary)

We present a comprehensive study of the high pressure behaviour of ReO$$_3$$ using X-ray and neutron diffraction, Raman scattering and first-principles calculations to 15 GPa. We show that the ambient pressure $$Pm$$$=3$m$$ structure converts at 0.7 GPa in a continuous phase transition directly to a cubic phase with space group $$Im$$$=3 which is then stable up to at least 15 GPa. We show that previous reports of monoclinic $C2/c$$ and rhombohedral $$R$$$=3$c$$ structures in this pressure range are an artifact due to an alteration of the sample by high-flux synchrotron X-ray radiation. The structural pressure dependence of the $$Im$$$=3 phase is reported as well as the precise equation of state. Raman scattering data of both natural and isotopically enriched $^{18}$$O samples are presented. The data shed light onto the unusual transition and densification mechanism due to progressive tilting of essentially rigid ReO$$_6$$ octahedra.

Journal Articles

Robustness of ferromagnetism in van der Waals magnet Fe$$_3$$GeTe$$_2$$ to hydrostatic pressure

Wang, Y.*; Zeng, X.-T.*; Li, B.*; Su, C.*; Hattori, Takanori; Sheng, X.-L.*; Jin, W.*

Chinese Physics B, 34(4), p.046203_1 - 046203_6, 2025/03

https://doi.org/10.1088/1674-1056/adb26f
 Times Cited Count：0 Percentile：0.00(Physics, Multidisciplinary)

Two-dimensional van der Waals ferromagnet Fe$$_3$$GeTe$$_2$$ (FGT) holds a great potential for applications in spintronic devices, due to its high Curie temperature, easy tunability, and excellent structural stability in air. In this study, we have performed high-pressure neutron powder diffraction (NPD) up to 5 GPa, to investigate the evolution of its structural and magnetic properties with hydrostatic pressure. The NPD data clearly reveal the robustness of the ferromagnetism in FGT, despite of an apparent suppression by hydrostatic pressure. As the pressure increases from 0 to 5 GPa, the Curie temperature is found to decrease monotonically from 225(5) K to 175(5) K, together with a dramatically suppressed ordered moment of Fe, which is well supported by the first-principles calculations. Although no pressure-driven structural phase transition is observed up to 5 GPa, quantitative analysis on the changes of bond lengths and bond angles indicate a significant modification of the exchange interactions, which accounts for the pressure-induced suppression of the ferromagnetism in FGT.

3133 (Records 1-20 displayed on this page)