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PULSE CATHODOLUMINESCENCE OF THE IMPURITY CENTERS IN CERAMICS BASED ON THE MgAl2O4 SPINEL

Abstract

The spectral and luminescence decay kinetics of magnesium aluminate spinel ceramics prepared by spark plasma sintering (SPS) technique and the starting nanopowders were studied. It was demonstrated that there are two types of luminescence in spinel ceramics can be observed after pulse e-beam excitation. The first type is intrinsic defects, and the second one responsible for Cr3+ and Mn2+ ions. It was shown that the luminescence decay kinetics for Cr3+ and Mn2+ impurity ions can be approximated by the sum of two exponents. The decay times for the Cr3+ ion are 35 and 409 ns, for the Mn2+ ion are 29 and 340 ns. High-temperature exposure during of 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 and this is associated with strong diffuse scattering of light for spinel nanopowders.

About the Authors

E. F. Polisadova
National Research Tomsk Polytechnic University
Russian Federation


V. A. Vaganov
National Research Tomsk Polytechnic University
Russian Federation


S. A. Stepanov
National Research Tomsk Polytechnic University
Russian Federation


V. D. Paygin
National Research Tomsk Polytechnic University
Russian Federation


O. L. Khasanov
National Research Tomsk Polytechnic University
Russian Federation


E. S. Dvilis
National Research Tomsk Polytechnic University
Russian Federation


D. T. Valiev
National Research Tomsk Polytechnic University
Russian Federation


R. G. Kalinin
National Research Tomsk Polytechnic University
Russian Federation


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Review

For citations:


Polisadova E.F., Vaganov V.A., Stepanov S.A., Paygin V.D., Khasanov O.L., Dvilis E.S., Valiev D.T., Kalinin R.G. PULSE CATHODOLUMINESCENCE OF THE IMPURITY CENTERS IN CERAMICS BASED ON THE MgAl2O4 SPINEL. Zhurnal Prikladnoii Spektroskopii. 2018;85(3):407-412. (In Russ.)

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