Analyses of Electric Field-Induced Phase Transformation by Luminescence Study in Eu<sup>3+</sup>-doped (Na, K)<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub> Ceramics
Most analyses of phase transformations detected by rare earth ions are based on the luminescence spectrum, while in this study we focus on the luminescence decay processes. We prepared Eu<sup>3+</sup>-doped (Na, K)<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</...
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doaj-e43e01fdc0ca415494ce3717999d60a72020-11-25T02:39:34ZengMDPI AGMaterials1996-19442020-03-01136134710.3390/ma13061347ma13061347Analyses of Electric Field-Induced Phase Transformation by Luminescence Study in Eu<sup>3+</sup>-doped (Na, K)<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub> CeramicsLiang Zeng0Ji Zhou1State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, ChinaState Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, ChinaMost analyses of phase transformations detected by rare earth ions are based on the luminescence spectrum, while in this study we focus on the luminescence decay processes. We prepared Eu<sup>3+</sup>-doped (Na, K)<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub> ceramics and studied their phase structure before and after poling by luminescence spectra, decay curves, and X-ray diffraction (XRD). Luminescence spectra indicated that electric fields induced a transformation in (Na<sub>0.8</sub>, K<sub>0.2</sub>)<sub>0.5</sub>Bi<sub>0.497</sub>Eu<sub>0.003</sub>TiO<sub>3</sub> (NKBET20) ceramic from tetragonal to rhombohedral phase (R phase). Based on the decay kinetics and the Judd−Ofelt theory, decay curves were shown to identify the fraction of the transformation quantitatively. The data from decay curves suggest that with electric fields increasing from 0 to 50 kV/cm, the R phase fraction increases from about 23 to 89% and the tetragonal phase (T phase) fraction decreases from about 77 to 11%. XRD Rietveld analyses further confirmed the results. In this work, the analyses of the phase fractions are simplified by the monoexponential decay of the pure phases and the biexponential decay of the mixed phase, showing an easy and inexpensive way of studying the phase structures of the materials.https://www.mdpi.com/1996-1944/13/6/1347luminescence lifetimejudd–ofelt theoryphase transformationquantitative analysesferroelectric ceramicsdecay kinetics |
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DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Liang Zeng Ji Zhou |
spellingShingle |
Liang Zeng Ji Zhou Analyses of Electric Field-Induced Phase Transformation by Luminescence Study in Eu<sup>3+</sup>-doped (Na, K)<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub> Ceramics Materials luminescence lifetime judd–ofelt theory phase transformation quantitative analyses ferroelectric ceramics decay kinetics |
author_facet |
Liang Zeng Ji Zhou |
author_sort |
Liang Zeng |
title |
Analyses of Electric Field-Induced Phase Transformation by Luminescence Study in Eu<sup>3+</sup>-doped (Na, K)<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub> Ceramics |
title_short |
Analyses of Electric Field-Induced Phase Transformation by Luminescence Study in Eu<sup>3+</sup>-doped (Na, K)<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub> Ceramics |
title_full |
Analyses of Electric Field-Induced Phase Transformation by Luminescence Study in Eu<sup>3+</sup>-doped (Na, K)<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub> Ceramics |
title_fullStr |
Analyses of Electric Field-Induced Phase Transformation by Luminescence Study in Eu<sup>3+</sup>-doped (Na, K)<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub> Ceramics |
title_full_unstemmed |
Analyses of Electric Field-Induced Phase Transformation by Luminescence Study in Eu<sup>3+</sup>-doped (Na, K)<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub> Ceramics |
title_sort |
analyses of electric field-induced phase transformation by luminescence study in eu<sup>3+</sup>-doped (na, k)<sub>0.5</sub>bi<sub>0.5</sub>tio<sub>3</sub> ceramics |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2020-03-01 |
description |
Most analyses of phase transformations detected by rare earth ions are based on the luminescence spectrum, while in this study we focus on the luminescence decay processes. We prepared Eu<sup>3+</sup>-doped (Na, K)<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub> ceramics and studied their phase structure before and after poling by luminescence spectra, decay curves, and X-ray diffraction (XRD). Luminescence spectra indicated that electric fields induced a transformation in (Na<sub>0.8</sub>, K<sub>0.2</sub>)<sub>0.5</sub>Bi<sub>0.497</sub>Eu<sub>0.003</sub>TiO<sub>3</sub> (NKBET20) ceramic from tetragonal to rhombohedral phase (R phase). Based on the decay kinetics and the Judd−Ofelt theory, decay curves were shown to identify the fraction of the transformation quantitatively. The data from decay curves suggest that with electric fields increasing from 0 to 50 kV/cm, the R phase fraction increases from about 23 to 89% and the tetragonal phase (T phase) fraction decreases from about 77 to 11%. XRD Rietveld analyses further confirmed the results. In this work, the analyses of the phase fractions are simplified by the monoexponential decay of the pure phases and the biexponential decay of the mixed phase, showing an easy and inexpensive way of studying the phase structures of the materials. |
topic |
luminescence lifetime judd–ofelt theory phase transformation quantitative analyses ferroelectric ceramics decay kinetics |
url |
https://www.mdpi.com/1996-1944/13/6/1347 |
work_keys_str_mv |
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