Hydrogen transport through interface between gas bubbling and liquid breeders

Kondo, Masatoshi; Oshima, Toshio; Tanaka, Masahiro; Muroga, T.; Sagara, A.

doi:10.1016/j.fusengdes.2012.02.097

Cited by 6 publications

(4 citation statements)

References 22 publications

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“…(6 -8). However, the solubility of hydrogen in Pb-Li alloys is quite small, though that in Li is large [21]. If the quantity of hydrogen generated by the chemical reactions in the fabrication procedure was larger than the solubility in the alloys, the excess hydrogen might be precipitated as H 2 molecules, and released to the outside of the alloy.…”

Section: Discussion On Chemical Behaviors Ofmentioning

confidence: 99%

“…Ammonia (NH 3 ) might be formed by the reaction between Li 3 N and H 2 O during the fabrication procedure according to the reaction of equation (16). NH 3 can be decomposed at the high temperature around 700 K in the reaction of equation (17). Desorption spectrum of H 2 in the test with Pb-17Li (type (A)) and Pb-28Li (type (A)) indicate the increase of hydrogen desorption around the temperature of 700 K. This desorption might be based on the chemical reaction expressed in equation (17).…”

Section: Chemical Behavior Of Non-metal Impurities In Pb-li Alloysmentioning

confidence: 99%

“…The Pb grains, which contained H 2 O as explained in chapters 3.1 and 3.2, were used for the fabrication of PbLi alloys [3]. Then, the large quantity of H 2 and LiH molecules must be generated according to the chemical reactions between Li and H 2 O.…”

Section: Hydrogen Desorption From Pb-li Alloysmentioning

confidence: 99%

“…The chemical compatibility of the Pb-Li alloy with candidate structural materials [1,2] and the chemical behavior of tritium in the alloy [3,4] are important issues. It is known that the chemical characteristics of liquid metals are determined by the impurities dissolved in the metals.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on Chemical Behaviors of Non-Metal Impurities in Pb, Pb-Bi and Pb-Li by Temperature Programmed Desorption Mass Spectrometer Analysis

Kondo

Nakajima

Tanaka

et al. 2016

Plasma and Fusion Research

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The chemical behaviors of non-metal impurities such as O 2 , H 2 , N 2 , H 2 O, CO 2 and CO in lead (Pb) metal, lead-bismuth (Pb-Bi) alloy and lead-lithium (Pb-Li) alloys were experimentally investigated by means of temperature programmed desorption mass spectrometer (TPD-MS) analysis. Desorption of H 2 O and CO 2 from the Pb metal and the Pb-Bi alloy was clearly detected by TPD-MS analysis. However, desorption of H 2 O and CO 2 from the Pb-Li alloys was much less than that from the Pb metal and the Pb-Bi alloy, since these molecules are chemically unstable and react with Li in the Pb-Li alloys. Then, oxygen and hydrogen must be dissolved in Pb-Li alloys as they form the chemical compounds of Li (i.e., Li 2 O, LiOH and LiH). Large desorption of hydrogen from solid Pb-Li alloys by their heating was detected. The possible mechanism for the large desorption of hydrogen from the Pb-Li alloys is based on the decomposition of LiH and Pb-Li-H at high temperature. The chemical behaviors of the non-metal impurities in the Pb-Li alloys was modeled based on the thermodynamic stability. The methodologies for the fabrication of high-purity Pb-Li alloys and the control of the impurity condition are discussed.

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Section: Discussion On Chemical Behaviors Ofmentioning

confidence: 99%