CHARACTERIZATION OF DEFECTS IN TUNGSTEN SAMPLES INTERESTED IN PFM STUDIES USING POSITRON ANNIHILATION AND PHOTOLUMINESCENCE SPECTROSCOPY

M. Torabi, O. Kakuee, S. Sobhanian and M. Kouhi
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M. Torabi: Department of physics, Islamic Azad University, Tabriz Branch, Tabriz 5157944533, Iran
O. Kakuee: ��Physics and Accelerators Research School, Nuclear Science and Technology Research Institute, P.O. Box 14395-836, Tehran 1439954831, Iran
S. Sobhanian: Department of physics, Islamic Azad University, Tabriz Branch, Tabriz 5157944533, Iran‡Department of Atomic and Molecular Physics, University of Tabriz, Tabriz 5166616471, Iran
M. Kouhi: Department of physics, Islamic Azad University, Tabriz Branch, Tabriz 5157944533, Iran

Surface Review and Letters (SRL), 2022, vol. 29, issue 04, 1-8

Abstract: The defect structure of four pure tungsten samples is investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), photoluminescence (PL) and positron annihilation spectroscopy (PAS) techniques before and after annealing. The results of the SEM and XRD analyses show that the grain size is increased up to 43.3μm, and their growth in the (2 0 0) orientation occurs at 1673K. Also, the smooth of the peaks at 1673K in the PL test demonstrates the increase of the size of defects of the sample. Moreover, the results of the PAS indicate a decrease in the concentration of defects and an increase in their size at 1673K, which confirms the results obtained from the PL measurement. The collected results from the four examination techniques are in close agreement with each other and reveal that w ith the increase in the annealing temperature of tungsten samples, a gradual coalescence of the defects would happen to lead to an increase in their size and hence a reduction in their number as well as preferred grain growth in the (2 0 0) orientation and virtually perfect recrystallization of the samples at higher temperatures.

Keywords: Tungsten; plasma-facing material; positron annihilation spectroscopy; photoluminescence spectroscopy (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1142/S0218625X22500536

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