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Journal Articles

Alteration-phase formation and associated cesium release during alteration of R7T7 waste glass

Inagaki, Yaohiro*; Idemitsu, Kazuya*; Arima, Tatsumi*; Maeda, Toshikatsu; Ogawa, Hiromichi; Itonaga, Fumio

Materials Research Society Symposium Proceedings, Vol.713, p.589 - 596, 2002/00

A large number of studies on HLW glass corrosion have shown that the glass reacts with water to form more stable mineral phases (alteration phases) during the long-term geological disposal. The phase formation is essential to evaluate the radionuclide release from the glass during the long-term disposal. The purpose of this study is to evaluate, experimentally, the mineral phase formation from HLW glass and the associated cesium release. Static corrosion tests were performed on powdered R7T7 glass in alkalline solutions at elevated temperatures to accelerate the reaction, and mineral phases formed were analyzed by XRD. The results showed that analcime (zeolite) is formed as the dominant phase coexisting with SiO$$_{2}$$(am), and beidellite(smectite) or gibbsite coexists dependiting on the conditions. The solution analysis indicated that most of the cesium is retained in the phases of beidellite and analcime by sorption.

Journal Articles

Sorption behavior of neptunium on bentonite; Effect of calcium ion on the sorption

Kozai, Naofumi; Onuki, Toshihiko; Muraoka, Susumu

Materials Research Society Symposium Proceedings, Vol.353, 0, p.1021 - 1028, 1995/00

no abstracts in English

Oral presentation

Synthesis and Cs-adsorption behavior of phyllosilicates in saponite-phlogopite system

Yamada, Hirohisa*; Yokoyama, Shingo*; Watanabe, Yujiro*; Morimoto, Kazuya*; Suzuki, Shinichi; Yaita, Tsuyoshi; Hatta, Tamao*

no journal, , 

Oral presentation

Expansion property of ammonium montmorillonite

Saito, Akito*; Kawakita, Ryohei*; Sakuma, Hiroshi*; Oda, Chie; Honda, Akira; Sato, Tsutomu*

no journal, , 

To understand the swelling behavior of NH$$_{4}$$-montmorillonite (MMT), the expandability of monoionic Na-, K- and NH$$_{4}$$-MMT was investigated by XRD under controlled relative humidity (RH) conditions and molecular dynamics (MD) calculations. XRD results indicate that the expansion properties of NH$$_{4}$$-MMT are similar to that of K-MMT for RH $$>$$ 30%. At RH $$<$$ 30%, however, NH$$_{4}$$-MMT expands further and has a larger basal spacing than both Na- and K-MMT. MD calculation results showed that NH$$_{4}$$-MMT reaches a one-layer hydration state under lower RH conditions than that of Na- and K-MMT, and was entirely consistent with the above observations by XRD. It was also confirmed that an irregular motion of interlayer NH$$_{4}$$$$^{+}$$ could result from bonds between H atoms of the NH$$_{4}$$$$^{+}$$ ion and the base O atoms of MMT. This irregular motion enabled the basal spacing of NH$$_{4}$$-MMT to increase and consequently, to expand further under low RH conditions.

Oral presentation

Expansion and alteration behavior of NH$$_4$$-montmorillonite

Kawakita, Ryohei*; Saito, Akito*; Sakuma, Hiroshi*; Anraku, Sohtaro; Oda, Chie; Mihara, Morihiro; Sato, Tsutomu*

no journal, , 

no abstracts in English

Oral presentation

Effect of ammonium ion on expandability of montmorillonite

Kawakita, Ryohei*; Saito, Akito*; Sakuma, Hiroshi*; Anraku, Sohtaro; Oda, Chie; Mihara, Morihiro; Sato, Tsutomu*

no journal, , 

no abstracts in English

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