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

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Abstract

<p>The chemical behaviors of non-metal impurities such as O<sub>2</sub>, H<sub>2</sub>, N<sub>2</sub>, H<sub>2</sub>O, CO<sub>2 </sub>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<sub>2</sub>O and CO<sub>2 </sub>from the Pb metal and the Pb-Bi alloy was clearly detected by TPD-MS analysis. However, desorption of H<sub>2</sub>O and CO<sub>2 </sub>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>i</i>.<i>e</i>., Li<sub>2</sub>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.</p>

Journal

  • Plasma and Fusion Research

    Plasma and Fusion Research 11(0), 2405076-2405076, 2016

    The Japan Society of Plasma Science and Nuclear Fusion Research

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