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Luminescence of the B1Σ+–X1Σ+ band system of MgO during plasma electrolytic oxidation of magnesium alloy

Authors
Journal
Surface and Coatings Technology
0257-8972
Publisher
Elsevier
Publication Date
Volume
206
Identifiers
DOI: 10.1016/j.surfcoat.2011.12.020
Keywords
  • Magnesium Alloy
  • Anodization
  • Plasma Electrolytic Oxidation
  • B–X Spectral System Of Mgo
Disciplines
  • Chemistry
  • Physics

Abstract

Abstract A broad luminescence peak with clearly pronounced structure, extending from roughly 19,950cm−1 to 20,400cm−1 is obtained during plasma electrolytic oxidation of magnesium alloy (96% Mg, 3% Al, 1% Zn). It is assigned to the v′−v″=0 band sequence of the B1Σ+–X1Σ+ emission transition of MgO. The measured intensity distribution is combined with quantum-chemical calculations in order to estimate the population of vibrational levels of the upper electronic state, and consequently to determine the plasma temperature. The composition of a plasma containing magnesium, oxygen, and hydrogen under assumption of local thermodynamic equilibrium is calculated in the temperature range up to 12,000K and for pressure of 105, 106, 107, and 108Pa, in order to explain the appearance of the observed spectral features.

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