Formation and thermochemical properties of oxychlorides of niobium (Nb) and tantalum (Ta); Towards the gas-phase investigation of dubnium (Db) oxychloride

Chiera, N. M.; Sato, Tetsuya; Tomitsuka, Tomohiro; Asai, Masato; Suzuki, Hayato*; Tokoi, Katsuyuki; Toyoshima, Atsushi; Tsukada, Kazuaki; Nagame, Yuichiro

Inorganica Chimica Acta, 486, p.361 - 366, 2019/02

https://doi.org/10.1016/j.ica.2018.10.032

The formation of NbOCl and TaOCl and their adsorption behavior on quartz surfaces was explored by applying an isothermal gas-chromatographic method. Trace amounts of short-lived Nb and Ta isotopes were used. Adsorption enthalpy values () at zero surface coverage of -(NbOCl) = 102 4 kJ/mol and -(TaOCl) = 128 5 kJ/mol were determined by analyzing the chromatographic behavior of the Nb andTa complexes with a Monte-Carlo simulation method based on an adsorption-desorption kinetic model.By applying an empirical correlation, the experimental values were successively related to the macroscopic standard sublimation enthalpy, , as a measure of the volatility of each substance. The inferred sublimation enthalpies are in agreement with tabulated thermochemical values. Thus, the linear empirical correlation between and for metal-oxychlorides was updated with the inclusion of the present data. According to the predicted (DbOCl), a (DbOCl) value of 135 2 kJ/mol was extrapolated. The future accomplishment of comparative studies with DbOCl under the same experimental conditions will provide valuable information on the volatility trend in Group-5 elements, together with an indication on the magnitude of relativistic effects on the electronic structure of dubnium.

Use of micro gas chromatography in the fuel cycle of fusion reactors

Laesser, R.*; Gruenhagen, S.*; Kawamura, Yoshinori

Fusion Engineering and Design, 69(1-4), p.813 - 817, 2003/09

https://doi.org/10.1016/S0920-3796(03)00413-7

Various analytical techniques exist to determine the compositions of gases handled in the fuel cycle of future fusion machines. Gas chromatography was found to be the most appropriate method. The main disadvantages of conventional gas chromatography were the long retention times for the heavy hydrogen species of more than half an hour. Recent progress in the development of micro-gas chromatography has reduced these retention times to approximately 3 minutes. The usefulness of micro-gas chromatography for the analysis of hydrogen and impurity gas mixtures in the fuel cycle of future fusion machines is presented and the advantages and draw backs are discussed.

Development of a micro gas chromatograph for the analysis of hydrogen isotope gas mixtures in the fusion fuel cycle

Kawamura, Yoshinori; Konishi, Satoshi; Nishi, Masataka

Fusion Engineering and Design, 58-59, p.389 - 394, 2001/11

https://doi.org/10.1016/S0920-3796(01)00378-7

no abstracts in English

Progress of fusion fuel processing system development at the Japan Atomic Energy Research Institute

Nishi, Masataka; Yamanishi, Toshihiko; Kawamura, Yoshinori; Iwai, Yasunori; Isobe, Kanetsugu; Ohira, Shigeru; Hayashi, Takumi; Nakamura, Hirofumi; Kobayashi, Kazuhiro; Suzuki, Takumi; et al.

Fusion Engineering and Design, 49-50, p.879 - 883, 2000/11

https://doi.org/10.1016/S0920-3796(00)00325-2

no abstracts in English

Decomposition experiment of dioxins by IR laser irradiation

Yamauchi, Toshihiko; Minehara, Eisuke; Kikuzawa, Nobuhiro; Hayakawa, Takehito; Sawamura, Masaru; Nagai, Ryoji; Nishimori, Nobuyuki; Hajima, Ryoichi; Shizuma, Toshiyuki; Kamei, Yasutaka*; et al.

Kankyo Kagakkai-Shi, 13(3), p.383 - 390, 2000/09

no abstracts in English

None

*; ; ;

PNC TN8410 95-010, 40 Pages, 1995/04

PNC-TN8410-95-010.pdf:1.41MB

None

Reduction of residual n-butyl acrylate sensitizer in radiation vulcanized natural rubber latex

C.Wang*; Yoshii, Fumio; ; Makuuchi, Keizo

Nihon Gomu Kyokai-Shi, 68(11), p.788 - 793, 1995/00

https://doi.org/10.2324/gomu.68.788

no abstracts in English

Design concept of a cryogenic distillation column cascade for a ITER scale fusion reactor

Yamanishi, Toshihiko; Enoeda, Mikio; Okuno, Kenji

JAERI-Tech 94-011, 32 Pages, 1994/07

JAERI-Tech-94-011.pdf:0.93MB

no abstracts in English

Tritium production technology

Tanase, Masakazu

Purazuma, Kaku Yugo Gakkai-Shi, 70(1), p.32 - 35, 1994/00

https://ci.nii.ac.jp/naid/110003825906

no abstracts in English

2.2,On-line chemical separation methods

Usuda, Shigekazu

Dai-4-Pan Jikken Kagaku Kouza, 14; Kaku, Hoshasen, p.124 - 140, 1992/00

no abstracts in English