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Journal Articles

Investigation of ruthenium compounds in the vitrification process condition

Nagai, Takayuki; Sato, Nobuaki*; Sasage, Kenichi

Busshitsu, Debaisu Ryoiki Kyodo Kenkyu Kyoten Kenkyu Seika Hokokusho (Heisei-27-Nendo) (CD-ROM), 2 Pages, 2016/03

no abstracts in English

Journal Articles

Thermal expansion and solubility limits of plutonium-doped lanthanum zirconates

Yamazaki, Satoshi*; Yamashita, Toshiyuki; Matsui, Tsuneo*; Nagasaki, Takanori*

Journal of Nuclear Materials, 294(1-2), p.183 - 187, 2001/04

 Times Cited Count:36 Percentile:7.68(Materials Science, Multidisciplinary)

no abstracts in English

JAEA Reports

None

; Koyama, Tomozo; Funasaka, Hideyuki

JNC-TN8400 99-021, 34 Pages, 1999/03

JNC-TN8400-99-021.pdf:1.27MB

None

Journal Articles

$$^{139}$$La NMR relaxation and chemical shift studies in the aqueous nitrate and chloride Solutions

Yaita, Tsuyoshi; ; Tachimori, Shoichi

Journal of Physical Chemistry B, 102(20), p.3886 - 3891, 1998/00

 Times Cited Count:25 Percentile:37.17(Chemistry, Physical)

no abstracts in English

JAEA Reports

None

Wada, Yukio; *; ; *

PNC-TY8607 97-002, 158 Pages, 1997/05

PNC-TY8607-97-002.pdf:3.2MB

no abstracts in English

Journal Articles

Determination of the hydration number of Cm(III) in various aqueous solutions

Kimura, Takaumi; Choppin, G. R.*; ; Yoshida, Zenko

Radiochimica Acta, 72, p.61 - 64, 1996/00

no abstracts in English

JAEA Reports

Basic studies about CMPO, Diamide comparison; Properties of Ln(III) extraction and behavior of third phase formation

; P.Y.COR*; *; ; ; *;

PNC-TN8410 95-112, 110 Pages, 1995/05

PNC-TN8410-95-112.pdf:3.67MB

PNC has developed the TRUEX process to recover transuranium elements from high level liquid waste. This process uses CMPO as extracting solvent. DIAMEX process which uses Diamide has been developed bY CEA in France. The aim of basic studies was to get some comparison data between CMPO and Diamide. We have conducted the experiments regarding properties of Ln(III) extraction and behavior of third phase formation. Also, we have investigated properties of Ln(III) extraction with TBP and DBBP to compare bidentate ligand with monodentate ligand. This study was conducted as a frame of PNC/CEA collaboration on minor Actinide partitioning. The conclusions drawn from our studies can be summarized as follows; (1)Trivalent Lanthanides extraction reaction. CMPO, TBP and DBBP ; Ln$$^{3-}$$ + 3NO$$_{3}^{-}$$ + 3Extractant $$leftrightarrow$$ Ln(NO$$_{3}$$)$$_{3}cdot$$ 3Extractant. Diamide; Ln$$^{3-}$$ + 3NO$$_{3}^{-}$$ + m Diamide $$leftrightarrow$$ Ln(NO$$_{3}$$)$$_{3}$$ $$cdot$$ m Diamide : m=O.7$$sim$$1.8. (2)Extraction equilibrium constant. Apparent extraction equilibrium constants were calculated from the trivalent Lanthanides extraction reaction. The value of the constants were CMPO $$>$$ Diamide $$>>$$ DBBP $$>$$ TBP.CMPO has high extraction efficiency for trivalent metals such as Am, but the back extraction is difficult in nitric acid media. Diamide indicated better behavior about both extraction and back extraction. (3)Separation Factors. We got separation factors (SFs) for intra-group in nitric acid. So SFs for CMPO and Diamide were nearly one, that these solvents could not separate each Lanthanides elements. The other hand, SFs for TBP and DBBP were 2 $$sim$$ 10. (4)Behavior of third phase formation. When using CMPO or Diamide, even in the case of extraction of nitric acid, third phase formation was found. When third phase was formed, the nitric acid concentration in aqueous phase was 6 N for CMPO, 4 N for Diamide. If Diamide diluted with Decaline was used, third phase wasn't found ...

Journal Articles

Luminescence study on determination of the hydration number of Cm(III)

Kimura, Takaumi; Choppin, G. R.*

Journal of Alloys and Compounds, 213-214, p.313 - 317, 1994/00

 Times Cited Count:240 Percentile:0.27(Chemistry, Physical)

no abstracts in English

Journal Articles

Magnetic studies on (U,La)O$$_{2+x}$$ solid solutions,II; Magnetic susceptibilities of solid solutions with high lanthanum and oxygen concentrations

Hinatsu, Yukio

Journal of Solid State Chemistry, 95, p.300 - 306, 1991/00

 Times Cited Count:5 Percentile:71.59(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Magnetic studies on (U,La)O$$_{2}$$$$_{+}$$$$_{x}$$ solid solutions

; Fujino, Takeo

Journal of Solid State Chemistry, (68), p.255 - 265, 1987/00

no abstracts in English

Journal Articles

Determination of oxygen in ternary uranium oxides by a gravimetric alkaline earth addition method

Fujino, Takeo; Tagawa, Hiroaki

Analytica Chimica Acta, 107, p.365 - 371, 1979/00

 Times Cited Count:2

no abstracts in English

Oral presentation

Investigation of the chemical form of ruthenium compounds in the vitrification process, 4; RuO$$_{2}$$ generation by reaction with Ru-La-Na mix nitrates and raw materials for vitrification

Nagai, Takayuki; Kobayashi, Hidekazu; Okamoto, Yoshihiro; Sato, Nobuaki*; Inose, Takehiko*; Sato, Seiichi*; Hatakeyama, Kiyoshi*; Seki, Katsumi*

no journal, , 

It is thought that a generated ruthenium compound grows from a high level radioactive liquid waste into RuO$$_{2}$$ crystal by reacting to raw materials for the vitrification process. In this study, the generation reaction to RuO$$_{2}$$ was confirmed by heating Ru-La-Na mix nitrates and the raw materials.

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