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Comparison of (K(0.5)Na(0.5))NbO(3) Single Crystals Grown by Seed-Free and Seeded Solid-State Single Crystal Growth

(K(0.5)Na(0.5))NbO(3)-based piezoelectric ceramics are of interest as a lead-free replacement for Pb(Zr,Ti)O(3). In recent years, single crystals of (K(0.5)Na(0.5))NbO(3) with improved properties have been grown by the seed-free solid-state crystal growth method, in which the base composition is dop...

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Autores principales: Fisher, John G., Sim, Su-Hyeon, Ðoàn, Trung Thành, Uwiragiye, Eugenie, Mok, Jungwi, Lee, Junseong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10224234/
https://www.ncbi.nlm.nih.gov/pubmed/37241265
http://dx.doi.org/10.3390/ma16103638
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author Fisher, John G.
Sim, Su-Hyeon
Ðoàn, Trung Thành
Uwiragiye, Eugenie
Mok, Jungwi
Lee, Junseong
author_facet Fisher, John G.
Sim, Su-Hyeon
Ðoàn, Trung Thành
Uwiragiye, Eugenie
Mok, Jungwi
Lee, Junseong
author_sort Fisher, John G.
collection PubMed
description (K(0.5)Na(0.5))NbO(3)-based piezoelectric ceramics are of interest as a lead-free replacement for Pb(Zr,Ti)O(3). In recent years, single crystals of (K(0.5)Na(0.5))NbO(3) with improved properties have been grown by the seed-free solid-state crystal growth method, in which the base composition is doped with a specific amount of donor dopant, inducing a few grains to grow abnormally large and form single crystals. Our laboratory experienced difficulty obtaining repeatable single crystal growth using this method. To try and overcome this problem, single crystals of 0.985(K(0.5)Na(0.5))NbO(3)-0.015Ba(1.05)Nb(0.77)O(3) and 0.985(K(0.5)Na(0.5))NbO(3)-0.015Ba(Cu(0.13)Nb(0.66))O(3) were grown both by seed-free solid-state crystal growth and by seeded solid-state crystal growth using [001] and [110]-oriented KTaO(3) seed crystals. X-ray diffraction was carried out on the bulk samples to confirm that single-crystal growth had taken place. Scanning electron microscopy was used to study sample microstructure. Chemical analysis was carried out using electron-probe microanalysis. The single crystal growth behaviour is explained using the mixed control mechanism of grain growth. Single crystals of (K(0.5)Na(0.5))NbO(3) could be grown by both seed-free and seeded solid-state crystal growth. Use of Ba(Cu(0.13)Nb(0.66))O(3) allowed a significant reduction in porosity in the single crystals. For both compositions, single crystal growth on [001]-oriented KTaO(3) seed crystals was more extensive than previously reported in the literature. Large (~8 mm) and relatively dense (<8% porosity) single crystals of 0.985(K(0.5)Na(0.5))NbO(3)-0.015Ba(Cu(0.13)Nb(0.66))O(3) can be grown using a [001]-oriented KTaO(3) seed crystal. However, the problem of repeatable single crystal growth remains.
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spelling pubmed-102242342023-05-28 Comparison of (K(0.5)Na(0.5))NbO(3) Single Crystals Grown by Seed-Free and Seeded Solid-State Single Crystal Growth Fisher, John G. Sim, Su-Hyeon Ðoàn, Trung Thành Uwiragiye, Eugenie Mok, Jungwi Lee, Junseong Materials (Basel) Article (K(0.5)Na(0.5))NbO(3)-based piezoelectric ceramics are of interest as a lead-free replacement for Pb(Zr,Ti)O(3). In recent years, single crystals of (K(0.5)Na(0.5))NbO(3) with improved properties have been grown by the seed-free solid-state crystal growth method, in which the base composition is doped with a specific amount of donor dopant, inducing a few grains to grow abnormally large and form single crystals. Our laboratory experienced difficulty obtaining repeatable single crystal growth using this method. To try and overcome this problem, single crystals of 0.985(K(0.5)Na(0.5))NbO(3)-0.015Ba(1.05)Nb(0.77)O(3) and 0.985(K(0.5)Na(0.5))NbO(3)-0.015Ba(Cu(0.13)Nb(0.66))O(3) were grown both by seed-free solid-state crystal growth and by seeded solid-state crystal growth using [001] and [110]-oriented KTaO(3) seed crystals. X-ray diffraction was carried out on the bulk samples to confirm that single-crystal growth had taken place. Scanning electron microscopy was used to study sample microstructure. Chemical analysis was carried out using electron-probe microanalysis. The single crystal growth behaviour is explained using the mixed control mechanism of grain growth. Single crystals of (K(0.5)Na(0.5))NbO(3) could be grown by both seed-free and seeded solid-state crystal growth. Use of Ba(Cu(0.13)Nb(0.66))O(3) allowed a significant reduction in porosity in the single crystals. For both compositions, single crystal growth on [001]-oriented KTaO(3) seed crystals was more extensive than previously reported in the literature. Large (~8 mm) and relatively dense (<8% porosity) single crystals of 0.985(K(0.5)Na(0.5))NbO(3)-0.015Ba(Cu(0.13)Nb(0.66))O(3) can be grown using a [001]-oriented KTaO(3) seed crystal. However, the problem of repeatable single crystal growth remains. MDPI 2023-05-10 /pmc/articles/PMC10224234/ /pubmed/37241265 http://dx.doi.org/10.3390/ma16103638 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Fisher, John G.
Sim, Su-Hyeon
Ðoàn, Trung Thành
Uwiragiye, Eugenie
Mok, Jungwi
Lee, Junseong
Comparison of (K(0.5)Na(0.5))NbO(3) Single Crystals Grown by Seed-Free and Seeded Solid-State Single Crystal Growth
title Comparison of (K(0.5)Na(0.5))NbO(3) Single Crystals Grown by Seed-Free and Seeded Solid-State Single Crystal Growth
title_full Comparison of (K(0.5)Na(0.5))NbO(3) Single Crystals Grown by Seed-Free and Seeded Solid-State Single Crystal Growth
title_fullStr Comparison of (K(0.5)Na(0.5))NbO(3) Single Crystals Grown by Seed-Free and Seeded Solid-State Single Crystal Growth
title_full_unstemmed Comparison of (K(0.5)Na(0.5))NbO(3) Single Crystals Grown by Seed-Free and Seeded Solid-State Single Crystal Growth
title_short Comparison of (K(0.5)Na(0.5))NbO(3) Single Crystals Grown by Seed-Free and Seeded Solid-State Single Crystal Growth
title_sort comparison of (k(0.5)na(0.5))nbo(3) single crystals grown by seed-free and seeded solid-state single crystal growth
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10224234/
https://www.ncbi.nlm.nih.gov/pubmed/37241265
http://dx.doi.org/10.3390/ma16103638
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