Pressure-modulated magnetism and negative thermal expansion in the HoFe intermetallic compound

Cao, Y.*; Zhou, H.*; Khmelevskyi, S.*; Lin, K.*; Avdeev, M.*; Wang, C.-W.*; Wang, B.*; Hu, F.*; Kato, Kenichi*; Hattori, Takanori; et al.

Chemistry of Materials, 35(8), p.3249 - 3255, 2023/04

https://doi.org/10.1021/acs.chemmater.3c00158

Hydrostatic and chemical pressure are efficient stimuli to alter the crystal structure and are commonly used for tuning electronic and magnetic properties in materials science. However, chemical pressure is difficult to quantify and a clear correspondence between these two types of pressure is still lacking. Here, we study intermetallic candidates for a permanent magnet with a negative thermal expansion (NTE). Based on in situ synchrotron X-ray diffraction, negative chemical pressure is revealed in HoFe on Al doping and quantitatively evaluated by using temperature and pressure dependence of unit cell volume. A combination of magnetization and neutron diffraction measurements also allowed one to compare the effect of chemical pressure on magnetic ordering with that of hydrostatic pressure. Intriguingly, pressure can be used to control suppression and enhancement of NTE. Electronic structure calculations indicate that pressure affected the top of the majority band with respect to the Fermi level, which has implications for the magnetic stability, which in turn plays a critical role in modulating magnetism and NTE. This work presents a good example of understanding the effect of pressure and utilizing it to control properties of functional materials.

Vaporization behaviour of Pu-Cd intermetallic compounds

Nakajima, Kunihisa; Nakazono, Yoshihisa; Arai, Yasuo

Recent Advances in Actinide Science, p.448 - 450, 2006/06

A pyrochemical process for the metallurgical treatment of the spent nuclear fuels contains the Cd-distillation step, where Pu is recovered as a residue. For understanding this Cd-ditillation behavior the samples of PuCd+PuCd and PuCd+PuCd were prepared and Knudsen-cell mass-spectrometric measurements were carried out to determine the vapour pressures of Cd(g) over these samples. Further,the thermodynamic quantities of PuCd and PuCd were evaluated from these vapour pressures.

Corrosion behavior of Al-surface-treated steels in liquid Pb-Bi in a pot

Kurata, Yuji; Futakawa, Masatoshi; Saito, Shigeru

Journal of Nuclear Materials, 335(3), p.501 - 507, 2004/12

https://doi.org/10.1016/j.jnucmat.2004.08.004

Corrosion tests were performed in oxygen-saturated liquid Pb-Bi at 450C and 550C in a pot for 3000h for Al-surface-treated steels containing various levels of Cr contents. The Al surface treatments were achieved using a gas diffusion method and a melt dipping method. AlO, FeAl and AlCr produced by the gas diffusion method exhibited corrosion resistance to liquid Pb-Bi, while the surface layer produced by the melt dipping method suffered a severe corrosion attack. FeAl and FeAl produced by the melt dipping method disappeared during the corrosion test at 550C and only FeAl remained.

Synthetic methods of uranium and neptunium compounds from solutions

Saeki, Masakatsu

JAERI-Review 2003-030, 50 Pages, 2003/11

JAERI-Review-2003-030.pdf:3.41MB

In this review, synthetic methods of uranium and neptunium compounds mainly from solutions and their natures are summarized. For uranium, 3 compounds of trivalent, 4 compounds of tetravalent and 23 compounds of hexavalent are described in slight details. For neptunium, synthetic methods of stock solutions for pentavalent and hexavalent neptunium, 4 items (6 compounds) of trivalent, 8 items (19 compounds) of tetravalent, 28 items (29 compounds) of pentavalent, 10 items (14 compounds) of hexavalent and 5 items (9 compounds) of heptavalent are described in slight details. Furthermore, on compounds which can not be described in details, the names are listed with literatures. The materials used here have been collected during the research activities on Moessbauer spectroscopic studies of uranium and neptunium compounds, then, the reviews on Moessbauer spectroscopic studies of actinoid compounds are also listed.

Amorphization from the quenched high-pressure phase in III-V and II-VI compounds

Mori, Yuki*; Kato, Sayuri*; Mori, Hiroko*; Katayama, Yoshinori; Tsuji, Kazuhiko*

Review of High Pressure Science and Technology, 7, p.353 - 355, 1998/03

http://ci.nii.ac.jp/naid/10002690121

The temperature dependence of phase transitions in GaSb, AlSb, GaAs, GaP, InAs, ZnSe, and CdTe are studied by X-ray diffraction measurements under pressure upto 30 GPa at temperatures of 90-300K. The phase transitions depend on paths in a pressure-temperature phase diagram. The structure of the recovered phase after decompression depends on the ionicity in bonding: amorphous for small ionicity, the stable zincblende structure for large ionicity, and microcrystalline or moderate ionicity. These results are discussed by using a configuration-coordinate model.

Ternary compounds PuNiC and PuCoC

; ; ;

Journal of Nuclear Science and Technology, 19(3), p.257 - 260, 1982/00

https://doi.org/10.3327/jnst.19.257

no abstracts in English

The thermal annealing of phosphorus-32 formed by the neutron irradiation of several inorganic phosphorus compounds

; ;

Bulletin of the Chemical Society of Japan, 36(8), p.928 - 937, 1963/00

https://doi.org/10.1246/bcsj.36.928

no abstracts in English

Solvent extraction of metals by organophosphorus compounds, 2; Particular extraction systems

Nihon Genshiryoku Gakkai-Shi, 4(3), p.166 - 174, 1962/00

https://doi.org/10.3327/jaesj.4.166

no abstracts in English

Electronic structure of actinide intermetallic compound ThRhGe; de Haas-van Alphen study

Haga, Yoshinori; Yamamoto, Etsuji; Nakamura, Ai*; Honda, Fuminori*; Aoki, Dai*; Matsumoto, Yuji*; Yamamura, Tomoo*; Shirasaki, Kenji*; Yamagami, Hiroshi*

no journal, ,