Repeatable photoinduced insulator-to-metal transition in yttrium oxyhydride epitaxial thin films

Komatsu, Yuya*; Shimizu, Ryota*; Sato, Ryuhei*; Wilde, M.*; Nishio, Kazunori*; Katase, Takayoshi*; Matsumura, Daiju; Saito, Hiroyuki*; Miyauchi, Masahiro*; Adelman, J. R.*; et al.

Chemistry of Materials, 34(8), p.3616 - 3623, 2022/04

https://doi.org/10.1021/acs.chemmater.1c03450

Challenge to spintronics at MLF

Shamoto, Shinichi; Ieda, Junichi

CROSS T&T, (69), p.35 - 39, 2021/10

no abstracts in English

Ultralow-energy magnon anomaly in yttrium iron garnet

Shamoto, Shinichi; Yasui, Yukio*; Matsuura, Masato*; Akatsu, Mitsuhiro*; Kobayashi, Yoshiaki*; Nemoto, Yuichi*; Ieda, Junichi

Physical Review Research (Internet), 2(3), p.033235_1 - 033235_6, 2020/08

https://doi.org/10.1103/PhysRevResearch.2.033235

Ultralow energy magnon in yttrium iron garnet crystal has been studied by inelastic neutron scattering in an energy range from 10 to 45 eV. When a magnetic field of about 0.1 T is applied along [111], ultralow energy magnon anomaly is found at 10 K.

Hydration of Y ion; A Car-Parrinello molecular dynamics study

Ikeda, Takashi; Hirata, Masaru; Kimura, Takaumi

Journal of Chemical Physics, 122(2), p.024510_1 - 024510_5, 2005/01

https://doi.org/10.1063/1.1832594

The solvation shell structure of Y and the dynamics of the hydrated ion in an aqueous solution of 0.8 YCl are studied in two conditions with and without an excess proton by using first principles molecular dynamics method. We find that the first solvation shell around Y contains eight water molecules forming a square antiprism as expected from X-ray absorption near edge structure in both the conditions we examined. A detailed analysis relying upon localized orbitals reveals that the complexation of water molecules with yttrium cation leads to a substantial amount of charge redistribution particularly on the oxygen atoms, giving rise to the chemical shifts of -20 ppm in O NMR relative to the computed nuclear shieldings of the bulk water.

Formation and evaluation of functionally gradient material for thermal stress relaxation, 1

; Hirakawa, Yasushi; Kano, Shigeki; Yoshida, Eiichi

PNC TN9410 98-048, 56 Pages, 1998/03

PNC-TN9410-98-048.pdf:7.03MB

Planar specimens of functionally gradient material (FGM) for thermal stress relaxation in fast reactor environment were formed and evaluated. FGMs of AlO-SUS316L system and YO-SUS316L system were deposited on SUS316L substrates by low pressure plasma spraying. The deposited coatings with 6 layers in which the ratio of ceramics/SUS316FR changes from 0 to 100% by 20% were successfully formed. Cross-sectional observation of the coatings showed no cracks and the hardness in the coating increased continuously from the substrate to the surface. From the results of X-ray diffraction, there were no changes in the structure of SUS316L and YO between the powder and the coating. On the contrary, in the case of AlO, - AlO phase was detected in the coating formed from __$ powder. The specimens were exposed in liquid sodium at 823K or 923K for 3.6Ms(1000h). The coatings were damaged with many cracks in liquid sodium. It was revealed that the bonding strength between the sprayed particles were not sufficient. To improve the stability in liquid sodium, another specimens were formed with changing the chamber pressure during deposition. From the microstructural inspections of the specimens, the coating formed at higher chamber pressure showed less porosity.

Change in property and structure of ceramics under complex conditions (II)

Terai, Takayuki*

PNC TJ9602 97-002, 75 Pages, 1997/03

PNC-TJ9602-97-002.pdf:2.68MB

Nuclear materials are often utilized under severe conditions such as high temperature, thermal transient, irradiation, corrosion by liquid metal, particle implantation, electric field and magnetic field, and an investigation on the behavior of the materials is strongly required. However, the property change is so complicated by cooperative effects of these conditions that there have been few studies on it. This project aims to clarify degradation mechanism of ceramics under the complex conditions and to contribute to the development of new advanced ceramics and surface modification. For such purposes, (1)to clarify the change in microstructure, composition and crystal structure of ceramics, (2)to analyze the distribution and condition of radiation defects and implanted ions, (3)to measure physical properties such as electric conductivity and (4)to investigate chemical and mechanical property change due to corrosion are to be carried out. In FY 1996, compatibility of several kinds of ceramic coating materials with liquid metals such as molten lithium and lithium-lead alloy (Li17-Pb83) and electrical resistivity change of these materials in the presence of the liquid metals were investigated. As a result, most of the results were in good agreement with a thermodynamic prediction and most of the compounds maintained their high electrical resistivity even in the presence of liquid lithium and lithium-lead alloy. In addition, it was pointed out that in case of YO, a complex compound (LiYO) and a non-stoichiometric compound (YO) were formed, which was out of the thermodynamic prediction.

None

Tsutagi, Koichi; Seki, Masayuki; Tobita, Noriyuki; ; *; *

PNC TN8410 91-174, 40 Pages, 1991/02

PNC-TN8410-91-174.pdf:5.06MB

None

None

Kato, Masato

PNC TN8410 90-079, 32 Pages, 1990/08

PNC-TN8410-90-079.pdf:0.58MB

None

Release of tritium from yttrium and its alloys in a gas stream

; P.W.Fisher*

Journal of Nuclear Materials, 144, p.151 - 156, 1987/00

https://doi.org/10.1016/0022-3115(87)90290-X

no abstracts in English

Diffusivities of hydrogen in yttrium and yttrium alloys

P.W.Fisher*;

Journal of Nuclear Materials, 122-123, p.1536 - 1540, 1984/00

no abstracts in English