Fizika Tverdogo Tela, 2019 Volume 61, Issue 12,Page 2425(Mi ftt8583)
International Conference ''Mechanisms and Nonlinear Problems of Nucleation, Growth of Crystals and Thin Films'' dedicated to the memory of the outstanding theoretical physicist Professor V.V. Slezov (Proceedings) St. Petersburg, July 1-5, 2019 Phase transitions
Determination of the crystallization temperature of mullite by luminescence spectra of europium and chromium ions
Abstract:
The luminescence spectra of Cr$^{3+}$ and Eu$^{3+}$ ions embedded in mullite ceramic samples are studied. The samples were annealed at temperatures from 600 to 1200$^\circ$Ñ. From the temperature of 800$^\circ$Ñ, the spectra demonstrated the presence of a newly-formed crystal phase. The appearing of the crystalline phase is revealed by significant changes in some parameters of the luminescence spectrum. At temperatures from 920 to 1200$^\circ$Ñ, the crystalline form manifested itself as a stable mullite phase.
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