Pulse Cathodoluminescence of the Impurity Centers in Ceramics Based on the MgAl2O4 Spinel

Pulse Cathodoluminescence of the Impurity Centers in Ceramics Based on the MgAl2O4 Spinel

The spectral and luminescence decay kinetics of magnesium aluminate spinel ceramics prepared by spark plasma sintering (SPS) and the starting nanopowders were studied. It was demonstrated that two types of luminescence in spinel ceramics can be observed after pulse e-beam excitation. The first type...

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Bibliographic Details
Published in:Journal of applied spectroscopy Vol. 85; no. 3; pp. 416 - 421
Main Authors: Polisadova, Е. F., Vaganov, V. А., Stepanov, S. A., Paygin, V. D., Khasanov, О. L., Dvilis, E. S., Valiev, D. Т., Kalinin, R. G.
Format: Journal Article
Language:English
Published: New York Springer US 01-07-2018
Springer Nature B.V
Subjects:
Analytical Chemistry
Atomic/Molecular Structure and Spectra
Cathodoluminescence
Ceramic powders
Ceramics
Chemical synthesis
Decay
Electron beams
Impurities
Luminescence
Magnesium aluminate
Manganese ions
Physics
Physics and Astronomy
Plasma sintering
Spark plasma sintering
Spinel
Trivalent chromium
Mn
pulse cathodoluminescence
spinel MgAl
decay time
ions
nanoceramic
O
Cr
spark plasma sintering technique
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Summary:The spectral and luminescence decay kinetics of magnesium aluminate spinel ceramics prepared by spark plasma sintering (SPS) and the starting nanopowders were studied. It was demonstrated that two types of luminescence in spinel ceramics can be observed after pulse e-beam excitation. The first type is due to intrinsic defects, and the second type due to Cr 3+ and Mn 2+ ions. It was shown that the luminescence decay kinetics for Cr 3+ and Mn 2+ impurity ions can be approximated by the sum of two exponents. The decay times for the Cr 3+ ion are 35 and 409 ns, for the Mn 2+ ion are 29 and 340 ns. High-temperature exposure during SPS synthesis does not lead to a change in the nearest surroundings of impurity ions. In the luminescence spectra of ceramic and powder samples the intensity ratio changes of intrinsic and impurity centers is associated with strong diffuse scattering of light for spinel nanopowders.
ISSN:0021-9037
1573-8647
DOI:10.1007/s10812-018-0666-9