Quantitative determination of element concentrations in industrial oxide materials by laser-induced breakdown spectroscopy |
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Authors: | B Praher R Rössler E Arenholz J Heitz J D Pedarnig |
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Institution: | (1) Christian Doppler Laboratory for Laser-Assisted Diagnostics, Institute of Applied Physics, Johannes Kepler University Linz, 4040 Linz, Austria;(2) voestalpine Stahl GmbH, 4031 Linz, Austria; |
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Abstract: | Calibration-free laser-induced breakdown spectroscopy (CF-LIBS) method is employed for quantitative determination of oxide
concentrations in multi-component materials. Industrial oxide materials from steel industry are laser ablated in air, and
the optical plasma emission is collected by spectrometers and gated detectors. The temperature and electron number density
of laser-induced plasma are determined from measured LIBS spectra. Emission lines of aluminium (Al), calcium (Ca), iron (Fe),
manganese (Mn), magnesium (Mg), silicon (Si), titanium (Ti), and chromium (Cr) of low self-absorption are selected, and the
concentration of oxides CaO, Al2O3, MgO, SiO2, FeO, MnO, TiO2, and Cr2O3 is calculated by CF-LIBS analysis. For all sample materials investigated, we find good match of calculated concentration
values (C
CF) with nominal concentration values (C
N). The relative error in oxide concentration, e
r = |C
CF − C
N|/C
N, decreases with increasing concentration and it is e
r ≤ 100% for concentration C
N ≥ 1 wt.%. The CF-LIBS results are stable against fluctuations of experimental parameters. The variation of laser pulse energy
over a large range changes the error by less than 10% for major oxides (C
N ≥ 10 wt.%). The results indicate that CF-LIBS method can be employed for fast and stable quantitative compositional analysis
of multi-component materials. |
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Keywords: | |
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