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Structure evolution and electrical properties of lead-free Bi0.5Na0.41K0.09TiO3 piezoceramics by isovalent La doping

This study investigated the structure evolution, surface morphology, dielectric properties, ferroelectric properties, piezoelectric properties, and electromechanical strain properties of lead-free (Bi0.5−xLax)(Na0.41K0.09)TiO3 piezoelectric ceramics. All samples were fabricated by a traditional soli...

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Main Authors: Tran, Vu Diem Ngoc, Le, Van Vinh, Vu, Lai Hoang, Nguyen, Ba Hung, Dinh, Thi Hinh, Pham, Ky Nam
Format: Article
Language:English
Published: Journal of Materials Science: Materials in Electronics 2021
Subjects:
Structure evolution
electrical properties
piezoceramics
isovalent La doping
Online Access:https://link.springer.com/article/10.1007/s10854-020-05179-5
https://doi.org/10.1007/s10854-020-05179-5
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spelling oai:localhost:PNK-14252022-08-17T05:54:53Z Structure evolution and electrical properties of lead-free Bi0.5Na0.41K0.09TiO3 piezoceramics by isovalent La doping Tran, Vu Diem Ngoc Le, Van Vinh Vu, Lai Hoang Nguyen, Ba Hung Dinh, Thi Hinh Pham, Ky Nam Structure evolution electrical properties piezoceramics isovalent La doping This study investigated the structure evolution, surface morphology, dielectric properties, ferroelectric properties, piezoelectric properties, and electromechanical strain properties of lead-free (Bi0.5−xLax)(Na0.41K0.09)TiO3 piezoelectric ceramics. All samples were fabricated by a traditional solid-state synthesis. The effects of La3+-isovalent substituted on Bi3+-site of the Bi0.5Na0.41K0.09TiO3 system were examined. The addition of La doping in the Bi0.5Na0.41K0.09TiO3 ceramics induced the second phase of K4Ti3O8 and a crystal structural change from the rhombohedral and tetragonal phase to a pseudocubic phase. All samples show similar grain morphology and dense microstructure with the average grain size around 1.33 to 1.61 μm. The dielectric curves and field-induced polarization loops of samples confirm the nonergodic-to-ergodic relaxor phase transformation, corresponding to the reduction of the temperature at the phase transition from ferroelectric to relaxor phase and the disruption of the ferroelectric properties happened in samples when increasing La3+ content. Besides, the maximum piezoelectric constant of 139 pC/N was found in (Bi0.48La0.02)(Na0.41K0.09)TiO3 ceramic, while the (Bi0.46La0.04)(Na0.41K0.09)TiO3 ceramic shows a maximum strain of ~ 0.2% at a low field of 40 kV/cm. 2021-05-31T07:23:11Z 2021-05-31T07:23:11Z 2021 Article Working Paper https://link.springer.com/article/10.1007/s10854-020-05179-5 https://doi.org/10.1007/s10854-020-05179-5 en application/pdf Journal of Materials Science: Materials in Electronics
institution Digital Phenikaa
collection Digital Phenikaa
language English
topic Structure evolution
electrical properties
piezoceramics
isovalent La doping
spellingShingle Structure evolution
electrical properties
piezoceramics
isovalent La doping
Tran, Vu Diem Ngoc
Le, Van Vinh
Vu, Lai Hoang
Nguyen, Ba Hung
Dinh, Thi Hinh
Pham, Ky Nam
Structure evolution and electrical properties of lead-free Bi0.5Na0.41K0.09TiO3 piezoceramics by isovalent La doping
description This study investigated the structure evolution, surface morphology, dielectric properties, ferroelectric properties, piezoelectric properties, and electromechanical strain properties of lead-free (Bi0.5−xLax)(Na0.41K0.09)TiO3 piezoelectric ceramics. All samples were fabricated by a traditional solid-state synthesis. The effects of La3+-isovalent substituted on Bi3+-site of the Bi0.5Na0.41K0.09TiO3 system were examined. The addition of La doping in the Bi0.5Na0.41K0.09TiO3 ceramics induced the second phase of K4Ti3O8 and a crystal structural change from the rhombohedral and tetragonal phase to a pseudocubic phase. All samples show similar grain morphology and dense microstructure with the average grain size around 1.33 to 1.61 μm. The dielectric curves and field-induced polarization loops of samples confirm the nonergodic-to-ergodic relaxor phase transformation, corresponding to the reduction of the temperature at the phase transition from ferroelectric to relaxor phase and the disruption of the ferroelectric properties happened in samples when increasing La3+ content. Besides, the maximum piezoelectric constant of 139 pC/N was found in (Bi0.48La0.02)(Na0.41K0.09)TiO3 ceramic, while the (Bi0.46La0.04)(Na0.41K0.09)TiO3 ceramic shows a maximum strain of ~ 0.2% at a low field of 40 kV/cm.
format Article
author Tran, Vu Diem Ngoc
Le, Van Vinh
Vu, Lai Hoang
Nguyen, Ba Hung
Dinh, Thi Hinh
Pham, Ky Nam
author_facet Tran, Vu Diem Ngoc
Le, Van Vinh
Vu, Lai Hoang
Nguyen, Ba Hung
Dinh, Thi Hinh
Pham, Ky Nam
author_sort Tran, Vu Diem Ngoc
title Structure evolution and electrical properties of lead-free Bi0.5Na0.41K0.09TiO3 piezoceramics by isovalent La doping
title_short Structure evolution and electrical properties of lead-free Bi0.5Na0.41K0.09TiO3 piezoceramics by isovalent La doping
title_full Structure evolution and electrical properties of lead-free Bi0.5Na0.41K0.09TiO3 piezoceramics by isovalent La doping
title_fullStr Structure evolution and electrical properties of lead-free Bi0.5Na0.41K0.09TiO3 piezoceramics by isovalent La doping
title_full_unstemmed Structure evolution and electrical properties of lead-free Bi0.5Na0.41K0.09TiO3 piezoceramics by isovalent La doping
title_sort structure evolution and electrical properties of lead-free bi0.5na0.41k0.09tio3 piezoceramics by isovalent la doping
publisher Journal of Materials Science: Materials in Electronics
publishDate 2021
url https://link.springer.com/article/10.1007/s10854-020-05179-5
https://doi.org/10.1007/s10854-020-05179-5
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score 8.891145

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