Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 859, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.157899
Keywords
Phosphors; High-pressure; Phase transitions; Luminescence; Inelastic light scattering
Categories
Funding
- University of Cantabria
- Government of Cantabria
- European Union [H2020-EU829161]
- Spanish Ministerio de Ciencia, Innovacion y Universidades [PGC2018-101464-B-I00]
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The high-pressure behavior of cubic Tb2O3 phase (C-type) was investigated using in situ photoluminescence and Raman spectroscopy. The results showed a structural phase transition sequence of Tb2O3 from cubic to monoclinic to trigonal under pressure.
The high-pressure behavior of cubic Tb2O3 phase (C-type) has been investigated by in situ photoluminescence and Raman spectroscopy up to 18 GPa and 22 GPa, respectively. The luminescence spectrum of Tb2O3 at ambient conditions shows its characteristic sharp-line emission bands with the most intense one corresponding to the D-5(4) -F- 7(5) transition, responsible for the green emission. Excitation and emission spectra measured at low temperature and at different emission and excitation wavelengths suggest that photoluminescence is governed by the Tb3+ in the non-centrosymmetric site (C-2). A phase transition between 7.2 and 8.6 GPa is observed by Raman and photoluminescence experiments and is associated with a cubic-to-monoclinic (B-type) structural transformation. From 14 GPa the predominant modes in the Raman spectrum correspond to those from the trigonal phase (A-type), indicating that the pressure-induced structural phase transition sequence of Tb2O3 is C -> B -> A. Upon pressure release, the starting cubic phase is not recovered, but the monoclinic one. (C) 2020 Elsevier B.V. All rights reserved.
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