Structure and Dielectric Behavior of Yb<sub>2</sub>O<sub>3</sub>-MgO Co-Doped 0.92BaTiO<sub>3</sub>-0.08(Na<sub>0.5</sub>Bi<sub>0.5</sub>)TiO<sub>3</sub> Ferroelectric Relaxor

Structure and Dielectric Behavior of Yb<sub>2</sub>O<sub>3</sub>-MgO Co-Doped 0.92BaTiO<sub>3</sub>-0.08(Na<sub>0.5</sub>Bi<sub>0.5</sub>)TiO<sub>3</sub> Ferroelectric Relaxor

Dielectric properties and structure of 0.015Yb<sub>2</sub>O<sub>3</sub>-<i>x</i>MgO doped 0.92BaTiO<sub>3</sub>-0.08(Na<sub>0.5</sub>Bi<sub>0.5</sub>)TiO<sub>3</sub> ceramics with <i>x</i> = 0.0–0.025 hav...

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Main Authors: Xiao-Hu Ren, Dong-Yun Gui
Format: Article
Language:English
Published: MDPI AG 2021-11-01
Series:Materials
Subjects:
ferroelectric relaxor
core–shell structure
Raman spectra
TEM
dielectric properties
Online Access:https://www.mdpi.com/1996-1944/14/22/6802
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author Xiao-Hu Ren
Dong-Yun Gui
author_facet Xiao-Hu Ren
Dong-Yun Gui
author_sort Xiao-Hu Ren
collection DOAJ
description Dielectric properties and structure of 0.015Yb<sub>2</sub>O<sub>3</sub>-<i>x</i>MgO doped 0.92BaTiO<sub>3</sub>-0.08(Na<sub>0.5</sub>Bi<sub>0.5</sub>)TiO<sub>3</sub> ceramics with <i>x</i> = 0.0–0.025 have been investigated. As Yb<sub>2</sub>O<sub>3</sub>-MgO was added into the BT-NBT, the phase changes from tetragonal to pseudo-cubic, with the tetragonality <i>c</i>/<i>a</i> decreases from 1.011 to 1.008 and XRD peaks broadened. The combined study of XRD and TEM image revealed a formation of core–shell structure in grains with core of 400–600 nm and the shell of a thickness 60–200 nm. There is a slowly phase transition against temperature from the variable temperature Raman analysis. The ferroelectric relaxor peak of BT-NBT decreases from ~4000 to ~2000 and a new broad dielectric peak with an equivalent maximum (<i>ε</i><sub>r</sub>′~2300) appears in the temperature dependent dielectric constant curve (<i>ε<sub>r</sub></i>′-<i>T</i>), which produces a flat <i>ε<sub>r</sub></i>′-<i>T</i> curve. Sample 0.92BaTiO<sub>3</sub>-0.08(Na<sub>0.5</sub>Bi<sub>0.5</sub>)TiO<sub>3</sub>-0.015Yb<sub>2</sub>O<sub>3</sub>-0.005 MgO and 0.92BaTiO<sub>3</sub>-0.08(Na<sub>0.5</sub>Bi<sub>0.5</sub>)TiO<sub>3</sub>-0.015Yb<sub>2</sub>O<sub>3</sub>-0.01MgO give a <i>ε</i><sub>r</sub>′ variation within ±14% and ±10% in 20–165 °C. The core–shell microstructure should take account for the flattened <i>ε</i><sub>r</sub>′–<i>T</i> behavior of these samples.
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spelling doaj.art-e6ce29e544e24ec0bac9f8588cee85d42023-11-23T00:09:00ZengMDPI AGMaterials1996-19442021-11-011422680210.3390/ma14226802Structure and Dielectric Behavior of Yb<sub>2</sub>O<sub>3</sub>-MgO Co-Doped 0.92BaTiO<sub>3</sub>-0.08(Na<sub>0.5</sub>Bi<sub>0.5</sub>)TiO<sub>3</sub> Ferroelectric RelaxorXiao-Hu Ren0Dong-Yun Gui1College of Materials Science and Engineering, Xi′an University of Architecture and Technology, Xi′an 710054, ChinaCollege of Materials Science and Engineering, Xi′an University of Architecture and Technology, Xi′an 710054, ChinaDielectric properties and structure of 0.015Yb<sub>2</sub>O<sub>3</sub>-<i>x</i>MgO doped 0.92BaTiO<sub>3</sub>-0.08(Na<sub>0.5</sub>Bi<sub>0.5</sub>)TiO<sub>3</sub> ceramics with <i>x</i> = 0.0–0.025 have been investigated. As Yb<sub>2</sub>O<sub>3</sub>-MgO was added into the BT-NBT, the phase changes from tetragonal to pseudo-cubic, with the tetragonality <i>c</i>/<i>a</i> decreases from 1.011 to 1.008 and XRD peaks broadened. The combined study of XRD and TEM image revealed a formation of core–shell structure in grains with core of 400–600 nm and the shell of a thickness 60–200 nm. There is a slowly phase transition against temperature from the variable temperature Raman analysis. The ferroelectric relaxor peak of BT-NBT decreases from ~4000 to ~2000 and a new broad dielectric peak with an equivalent maximum (<i>ε</i><sub>r</sub>′~2300) appears in the temperature dependent dielectric constant curve (<i>ε<sub>r</sub></i>′-<i>T</i>), which produces a flat <i>ε<sub>r</sub></i>′-<i>T</i> curve. Sample 0.92BaTiO<sub>3</sub>-0.08(Na<sub>0.5</sub>Bi<sub>0.5</sub>)TiO<sub>3</sub>-0.015Yb<sub>2</sub>O<sub>3</sub>-0.005 MgO and 0.92BaTiO<sub>3</sub>-0.08(Na<sub>0.5</sub>Bi<sub>0.5</sub>)TiO<sub>3</sub>-0.015Yb<sub>2</sub>O<sub>3</sub>-0.01MgO give a <i>ε</i><sub>r</sub>′ variation within ±14% and ±10% in 20–165 °C. The core–shell microstructure should take account for the flattened <i>ε</i><sub>r</sub>′–<i>T</i> behavior of these samples.https://www.mdpi.com/1996-1944/14/22/6802ferroelectric relaxorcore–shell structureRaman spectraTEMdielectric properties
spellingShingle Xiao-Hu Ren
Dong-Yun Gui
Structure and Dielectric Behavior of Yb<sub>2</sub>O<sub>3</sub>-MgO Co-Doped 0.92BaTiO<sub>3</sub>-0.08(Na<sub>0.5</sub>Bi<sub>0.5</sub>)TiO<sub>3</sub> Ferroelectric Relaxor
Materials
ferroelectric relaxor
core–shell structure
Raman spectra
TEM
dielectric properties
title Structure and Dielectric Behavior of Yb<sub>2</sub>O<sub>3</sub>-MgO Co-Doped 0.92BaTiO<sub>3</sub>-0.08(Na<sub>0.5</sub>Bi<sub>0.5</sub>)TiO<sub>3</sub> Ferroelectric Relaxor
title_full Structure and Dielectric Behavior of Yb<sub>2</sub>O<sub>3</sub>-MgO Co-Doped 0.92BaTiO<sub>3</sub>-0.08(Na<sub>0.5</sub>Bi<sub>0.5</sub>)TiO<sub>3</sub> Ferroelectric Relaxor
title_fullStr Structure and Dielectric Behavior of Yb<sub>2</sub>O<sub>3</sub>-MgO Co-Doped 0.92BaTiO<sub>3</sub>-0.08(Na<sub>0.5</sub>Bi<sub>0.5</sub>)TiO<sub>3</sub> Ferroelectric Relaxor
title_full_unstemmed Structure and Dielectric Behavior of Yb<sub>2</sub>O<sub>3</sub>-MgO Co-Doped 0.92BaTiO<sub>3</sub>-0.08(Na<sub>0.5</sub>Bi<sub>0.5</sub>)TiO<sub>3</sub> Ferroelectric Relaxor
title_short Structure and Dielectric Behavior of Yb<sub>2</sub>O<sub>3</sub>-MgO Co-Doped 0.92BaTiO<sub>3</sub>-0.08(Na<sub>0.5</sub>Bi<sub>0.5</sub>)TiO<sub>3</sub> Ferroelectric Relaxor
title_sort structure and dielectric behavior of yb sub 2 sub o sub 3 sub mgo co doped 0 92batio sub 3 sub 0 08 na sub 0 5 sub bi sub 0 5 sub tio sub 3 sub ferroelectric relaxor
topic ferroelectric relaxor
core–shell structure
Raman spectra
TEM
dielectric properties
url https://www.mdpi.com/1996-1944/14/22/6802
work_keys_str_mv AT xiaohuren structureanddielectricbehaviorofybsub2subosub3submgocodoped092batiosub3sub008nasub05subbisub05subtiosub3subferroelectricrelaxor
AT dongyungui structureanddielectricbehaviorofybsub2subosub3submgocodoped092batiosub3sub008nasub05subbisub05subtiosub3subferroelectricrelaxor

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