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Trapping and Retention of Gases in Surface Layers Formed during the Deposition of Beryllium and Aluminum Atoms on Tungsten

Journal of Surface Investigation, ISSN: 1819-7094, Vol: 17, Issue: Suppl 1, Page: S68-S77
2023
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Article Description

Abstract: In this work, thermal-desorption spectrometry is used to study Be–W and Al–W intermetallic compounds formed on the surface of tungsten during the deposition of Be and Al atoms evaporated in the temperature range of 400–500 K, as well as Al atoms sputtered in argon plasma. Due to safety limitations imposed on work with beryllium in the university laboratory, most of the experiments are carried out with aluminum which is one of the proxy materials to beryllium. Regularities for the formation of intermetallics in the surface layer of tungsten during the deposition of Al and Be atoms, and in the layer formed during the joint deposition of Al and W atoms on tungsten are described. The features of the trapping of argon and hydrogen into the intermetallics are analyzed for different fluences of Al atoms deposited in plasma on the surface of tungsten, as well as for different concentrations of components in the deposition flux during the simultaneous deposition of Al and W atoms on tungsten. The features of the Al–W intermetallic formation and the nature of the retention and desorption of gases during the deposition of evaporated and plasma-sputtered aluminum atoms on tungsten are revealed. The release of a significant part of hydrogen from the Al–W intermetallic under irradiation with 50 eV ions of deuterium plasma at a temperature of 500 K is found. Most of the gases trapped by Be–W and Al–W intermetallics is desorbed in the interval of 1200–1600 K during intermetallics decomposition.

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