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Quantitative analyses of electric field–induced phase transition in (Na, K) 0.5 Bi 0.5 TiO 3 :Eu ceramics by photoluminescence
Author(s) -
Zeng Liang,
Zhou Ji
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16866
Subject(s) - photoluminescence , phase transition , materials science , magnetic dipole transition , tetragonal crystal system , poling , rietveld refinement , electric dipole transition , phase (matter) , analytical chemistry (journal) , ferroelectricity , electric field , dipole , crystallography , condensed matter physics , chemistry , crystal structure , dielectric , magnetic dipole , physics , optoelectronics , quantum mechanics , organic chemistry , chromatography
Most reported results about phase transition probed by the photoluminescence (PL) spectra of Eu 3+ ions are qualitative, but the quantitative analyses of phase transition were presented in this work. We fabricated (Na 0.8 , K 0.2 ) 0.5 Bi 0.497 Eu 0.003 TiO 3 (NKBT20:Eu) ferroelectric ceramics and investigated the phase structures and the PL spectra of NKBT20:Eu ceramics before and after poling at different electric fields. The PL spectra indicate a phase transition from tetragonal phase (T phase) to rhombohedral phase (R phase) within NKBT20:Eu ceramics after poling, consistent with the analyses by X‐ray diffraction (XRD). Moreover, the emission intensity ratios of the “hypersensitive” transition5 D 0 →7 F 2to the magnetic dipole transition5 D 0 →7 F 1could be used to calculate the fractions of the phase transition quantitatively, which were further confirmed by XRD Rietveld refinements. This study provides a different perspective to investigate the phase transition induced by electric field for NKBT20:Eu ceramics, qualitatively and quantitatively, and the method is expected to be useful in more cases of phase analyses.