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Journal Articles

In situ synthesis of volatile carbonyl complexes with short-lived nuclides

Even, J.*; Ackermann, D.*; Asai, Masato; Block, M.*; Brand, H.*; Di Nitto, A.*; Dllmann, Ch. E.*; Eichler, R.*; Fan, F.*; Haba, Hiromitsu*; et al.

Journal of Radioanalytical and Nuclear Chemistry, 303(3), p.2457 - 2466, 2015/03

https://doi.org/10.1007/s10967-014-3793-7

Times Cited Count：15 Percentile：77.35(Chemistry, Analytical)

Rapid In situ synthesis of metal carbonyl complexes has been demonstrated using short-lived isotopes produced in nuclear fission and fusion reactions. The short-lived isotopes with high recoil energy directly react with carbon-monoxides and form carbonyl complexes. Only highly volatile complexes were fast transported in a gas stream to counting and chemistry devices. Short-lived Mo, Tc, Ru, Rh, W, Re, Os, and Ir were found to form volatile carbonyl complexes, while no volataile complex of Hf and Ta were detected. This technique has been applied to a chemical investigation of the superheavy element Sg (atomic number 106), and will be applicable to various fields of nuclear science with short-lived transition metal isotopes.

Journal Articles

High-resolution soft X-ray photoemission spectroscopy of spinel-type compound CuIr $_{2}$ S $_{4}$

Okane, Tetsuo; Fujimori, Shinichi; Mamiya, Kazutoshi; Okamoto, Jun; Muramatsu, Yasuji; Fujimori, Atsushi; Suzuki, Hiroyuki*; Matsumoto, Takehiko*; Furubayashi, Takao*; Isobe, Masaaki*; et al.

Journal of Magnetism and Magnetic Materials, 272-276(Suppl.), p.e297 - e298, 2004/05

https://doi.org/10.1016/j.jmmm.2003.11.171

Times Cited Count：5 Percentile：29.73(Materials Science, Multidisciplinary)

The electronic structure of spinel-type chalcogenide CuIr $_{2}$ S $_{4}$ , which exhibits a metal-insulator transition (MIT) as a function of temperature, has been studied by photoemission spectroscopy (PES). Below the transition temperature $T_{mathrm{MI}}$ , the valence-band PES spectra indicate a gap formation, while the overall valence-band structure is shifted to the higher binding-energy side. The line shape of the Ir 4 core-level PES spectra shows a dramatic change across $T_{mathrm{MI}}$ , which may be associated with the variation of the Ir 5 electron states.

Journal Articles

Theoretical study on the alloying behavior of -uranium metal; -uranium alloy with 3d transition metals

Kurihara, Masayoshi*; Hirata, Masaru; Sekine, Rika*; Onoe, Jun*; Nakamatsu, Hirohide*

Journal of Nuclear Materials, 326(2-3), p.75 - 79, 2004/03

https://doi.org/10.1016/j.jnucmat.2003.11.013

Times Cited Count：12 Percentile：61.44(Materials Science, Multidisciplinary)

We have investigated the alloying behavior of g-uranium with 3d transition metals (TMs) using the relativistic discrete-variational Dirac-Fock-Slater (DV-DFS) method. The d-orbital energy (Md) as an alloying parameter well reproduces the alloying behavior of g- uranium metal with TMs: (1) in the case of a large Md value (Ti,V,Cr), the solubility of these TM elements in g-uranium becomes large; (2) in the case of a middle Md value (Mn,Fe,Co), the tendency to form a uranium intermetallic compound with these elements becomes stronger; (3) in the case of a small Md value (Cu), the alloying element is insoluble in g-uranium. The alloying behavior of g-uranium with TMs is also discussed in terms of other parameters such as electronegativity and metallic radius.

Journal Articles

Phonon density of states in Sr $_{2}$ FeCoO $_{6-delta}$ and SrBaFeCoO $_{6-delta}$ ; Effects induced by magnetic order and transport coherence

Rykov, A. I.*; Nomura, Kiyoshi*; Sawada, Tsuguo*; Mitsui, Takaya; Seto, Makoto*; Tamegai, Tsuyoshi*; Tokunaga, Masashi*

Physical Review B, 68(22), p.224401_1 - 224401_7, 2003/12

https://doi.org/10.1103/PhysRevB.68.224401

Times Cited Count：8 Percentile：42.85(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

X-ray structural studies on elemental liquids under high pressures

Katayama, Yoshinori; Tsuji, Kazuhiko*

Journal of Physics; Condensed Matter, 15(36), p.6085 - 6103, 2003/09

https://doi.org/10.1088/0953-8984/15/36/302

Times Cited Count：81 Percentile：92.54(Physics, Condensed Matter)

X-ray structural studies on several elemental liquids under high pressure are reviewed. Combination of synchrotron radiation sources and large volume presses enables us to carry out in-situ structural measurements on liquids at high pressures up to several GPa. The measurements have revealed that compressions of liquid alkali metals are almost uniform, whereas those of liquids that have covalent components in bonding are mostly anisotropic. In some elements, different types of volume dependence of the nearest neighbour distances are observed in different pressure ranges. This behaviour suggests that the liquid phase can be divided in regions. Although most of the observed structural changes are continuous, a discovery of an abrupt structural change in liquid phosphorus, which is completed over a pressure range of less than 0.05 GPa around 1GPa and 1050 $^{circ}$ C, supports existence of a first-order liquid-liquid phase transition.

Journal Articles

X-ray magnetic circular dichroism at the edge of Mn $_{3}$ GaC

Takahashi, Manabu*; Igarashi, Junichi

Physical Review B, 67(24), p.245104_1 - 245104_5, 2003/06

https://doi.org/10.1103/PhysRevB.67.245104

Times Cited Count：23 Percentile：70.58(Materials Science, Multidisciplinary)

We theoretically investigate the origin of the X-ray magnetic circular dichroism (XMCD) spectra at the K edge of Mn and Ga in the ferromagnetic phase of Mn $_{3}$ GaC on the basis of an ab initio calculation. Taking account of the spin-orbit interaction in the LDA scheme, we obtain the XMCD spectra in excellent agreement with the recent experiment. We have analyzed the origin of each structure, and thus elucidated the mechanism of inducing the orbital polarization in the p symmetric states. We also discuss a simple sum rule connecting the XMCD spectra with the orbital moment in the p symmetric states.

Journal Articles

Symmetry breaking in the metal-insulator transition of BaVS $_{3}$

Inami, Toshiya; Owada, Kenji; Kimura, Hiroyuki*; Watanabe, Masashi*; Noda, Yukio*; Nakamura, Hiroyuki*; Yamasaki, Tomoaki*; Shiga, Masayuki*; Ikeda, Naoshi*; Murakami, Yoichi

Physical Review B, 66(7), p.073108_1 - 073108_4, 2002/08

https://doi.org/10.1103/PhysRevB.66.073108

Times Cited Count：45 Percentile：84.68(Materials Science, Multidisciplinary)

It has been believed for a long time that the metal-to-insulator (MI) transition of BaVS $_{3}$ is not accompanied by any spatial order of spin and lattice. We have carried out x-ray diffraction measurements of BaVS $_{3}$ single crystals using laboratory x-ray source as well as synchrotron radiation, and found that superlatiice reflections which double the lattice constant c exist below the transition temperature. The most porbable space group at the low-temperature insulator phase contains two in equivalent vanadium sites and thus a charge disproportionation of the vnadium ions is considered as the main cause of the MI transition.

Journal Articles

XAFS study on RbC $_{60}$

Kubozono, Yoshihiro*; Mimura, Kazue*; Takabayashi, Yasuhiro*; Maeda, Hironobu*; Kashino, Setsuo*; Emura, Shuichi*; Nishihata, Yasuo; Uruga, Tomoya*; Tanaka, Tsunehiro*; Takahashi, Masao*

Journal of Synchrotron Radiation, 6(Part3), p.564 - 566, 1999/05

The Rb K-edge XAFS spectra for the stable phase of RbC60 which is a quasi one-dimensional polymer were measured in the temperature range from 14.6 to 210 K in order to clarify the origin of the metal-insulator transition around 50 K. The distances and mean-square relative displacements between the Rb atom and the neighboring C atoms determined by XAFS exhibited no change around 50 K, implying that the metal-insulator transition originates from the SDW instablity.

Journal Articles