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

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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Main Authors: Liang Zeng, Ji Zhou
Format: Article
Language:English
Published: MDPI AG 2020-03-01
Series:Materials
Subjects:
luminescence lifetime
judd–ofelt theory
phase transformation
quantitative analyses
ferroelectric ceramics
decay kinetics
Online Access:https://www.mdpi.com/1996-1944/13/6/1347
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spelling 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&#8722;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
collection 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&#8722;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 AT liangzeng analysesofelectricfieldinducedphasetransformationbyluminescencestudyineusup3supdopednaksub05subbisub05subtiosub3subceramics
AT jizhou analysesofelectricfieldinducedphasetransformationbyluminescencestudyineusup3supdopednaksub05subbisub05subtiosub3subceramics
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