Thermodynamic Properties of Li-LiH (LiD, LiT) Systems. The Phase Diagram

Abstract

The paper presents a comprehensive critical review and detailed analysis of the literature, published in the field of the phase diagram solution Li-LiH (LiD, LiT). Special attention is paid to the completeness of the source information on the paper's topic resulting in an extended reference list. Particularly, paper reviews rarely used sources including littleknown publications from research centers, proceedings of the international scientific meetings and dissertations. These publications were more thoroughly analyzed in order to make the information available to the scientific society.

Deuterium retention and removal in liquid lithium determined by in situ NRA in Magnum-PSI

“…To gain insights into deuterium retention in lithium, a first understanding of the Li-LiD phase diagram is needed, which is illustrated in figure 1 following [40][41][42][43][44]. The phase diagram is displayed as a function of temperature and deuterium atomic fraction, and mainly consists of five regions as described below.…”

“…(I) Both Li and LiD are present as solids at temperature below Li melting point (∼180.5 • C); (II) The region is a deuterium solution of liquid lithium, where deuterium concentration is below its solubility limit that can be described by equation (1) as below [40,42]. The equation offers a liquidus line to separate regions (II) and (III).…”

A study on hydrogen absorption and dissolution in liquid lithium

“…Using the point where the resistance drastically changes during TPD, as seen in figure 6, as an upper bound, one can determine the amount of hydrogen that was initially dissolved into the lithium by integrating the instantaneous hydrogen evolution rates (H 2 molecules per second) over time up to this upper bound. In looking at how sample temperature affected the lithium-hydrogen chemistry, these results were then compared to theory [26] used to define the liquidus curve in the lithium-lithium hydride phase diagram. From the plots in figure 10, experimental dissolution trends approach thermodynamic predictions at higher exposure temperatures, but deviate significantly at lower exposure temperatures.…”

“…In all cases, the recovered flux in the primary desorption period, considered to be recovery from the α phase, was found [26], which describes the thermodynamic solubility limitations. (Left) Black diamonds and the cyan shaded region represent the corrected data and error assuming a linear contribution from the β phase.…”

“…Plots illustrating the corrected dissolved fraction of LiH in Li solutions at various temperatures. These are plotted relative to the theory proposed by Yakimovich et al[26], which describes the thermodynamic solubility limitations. (Left) Black diamonds and the cyan shaded region represent the corrected data and error assuming a linear contribution from the β phase.…”