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Title: Temperature-induced structural transformations in undoped and Eu3+-Doped ruddlesden-popper phases Sr2SnO4 and Sr3Sn2O7: relation to the impedance and luminescence behaviors
Author: Stanulis, Andrius
Katelnikovas, Arturas
Salak, Andrei N
Seibutas, Povilas
Ivanov, Maksim
Grigalaitis, Robertas
Banys, Juras
Kareiva, Aivaras
Ramanauskas, Rimantas
Barron, Andrew R
Issue Date: 3-Sep-2019
Publisher: ACS Publications
Abstract: We report that luminescence of Eu3+ ion incorporated into Ruddlesden-Popper phases allows monitoring phase transition in powders (instead of single crystals), in a time-efficient manner (compared to neutron diffraction), and importantly, with greater sensitivity than previous methods. Crystal structure and dielectric response of undoped and 0.5%Eu3+-doped Sr3Sn2O7 ceramics were studied as a function of temperature over the temperature range of 300-800 K. The luminescence studies of 0.5%Eu3+-doped Sr2SnO4 and Sr3Sn2O7 samples were performed in the temperature range of 80-500 K. These results were compared with the respective dependences for the undoped compounds. The structural transformations in 0.5%Eu3+-doped Sr3Sn2O7 were found at 390 and 740 K. The former is associated with the isostructural atomic rearrangement that resulted in a negative thermal expansion along two of three orthorhombic crystallographic axes, while the latter corresponds to the structural transition from the orthorhombic Amam phase to the tetragonal I4/mmm one. A similar temperature behavior with the structural transformations in the same temperature ranges was observed in undoped Sr3Sn2O7, although the values of lattice parameters of the Eu3+-doped and undoped compounds were found to be slightly different indicating an incorporation of europium in the crystal lattice. A dielectric anomaly associated with a structural phase transition was observed in Sr3Sn2O7 at 390 K. Optical measurements performed over a wide temperature range demonstrated a clear correlation between structural transformations in Eu3+-doped Sr2SnO4 and Sr3Sn2O7 and the temperature anomalies of their luminescence spectra, suggesting the efficacy of this method for the determination of subtle phase transformations.
Peer review: yes
DOI: 10.1021/acs.inorgchem.9b00958
ISSN: 0020-1669
Appears in Collections:CICECO - Artigos

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