Achieving a high dielectric tunability in strain-engineered tetragonal K0.5Na0.5NbO3 films

Abstract Using a modified Landau-Devonshire type thermodynamic potential, we show that dielectric tunability η of a tetragonal ferroelectric film can be analytically solved. At a given electric field E, η is a function of the remnant polarization ( $$P_0^f$$ P 0 f ) and the small-field relative diel...

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Autores principales:	Lanxia Hao, Yali Yang, Yu Huan, Hongbo Cheng, Yu-Yao Zhao, Yingying Wang, Jing Yan, Wei Ren, Jun Ouyang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492 Computer software QA76.75-76.765
Acceso en línea:	https://doaj.org/article/445528dad3294ddd8f0563b9b1a5f2d3
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spelling	oai:doaj.org-article:445528dad3294ddd8f0563b9b1a5f2d32021-12-02T14:49:42ZAchieving a high dielectric tunability in strain-engineered tetragonal K0.5Na0.5NbO3 films10.1038/s41524-021-00528-22057-3960https://doaj.org/article/445528dad3294ddd8f0563b9b1a5f2d32021-05-01T00:00:00Zhttps://doi.org/10.1038/s41524-021-00528-2https://doaj.org/toc/2057-3960Abstract Using a modified Landau-Devonshire type thermodynamic potential, we show that dielectric tunability η of a tetragonal ferroelectric film can be analytically solved. At a given electric field E, η is a function of the remnant polarization ( $$P_0^f$$ P 0 f ) and the small-field relative dielectric permittivity ( $$\chi _0^f$$ χ 0 f ), which are commonly measured material properties. After a survey of materials, a large η~80% is predicted to be achievable in a (001)-oriented tetragonal (K0.5,Na0.5)NbO3 film. This strain-stabilized tetragonal phase is verified by density functional theory (DFT) calculations. (K0.5,Na0.5)NbO3 films based on this design were successfully prepared via a sputtering deposition process on SrRuO3-buffered (100)SrTiO3 substrates. The resulted epitaxial films showed a sizable $$P_0^f$$ P 0 f (~0.21C m−2) and a large $$\chi _0^f$$ χ 0 f (~830–860), as well as a large η close to the theoretical value. The measured dielectric tunabilities as functions of E are well described by the theoretical η(E) curves, validating our integrated approach rooted in a theoretical understanding.Lanxia HaoYali YangYu HuanHongbo ChengYu-Yao ZhaoYingying WangJing YanWei RenJun OuyangNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492Computer softwareQA76.75-76.765ENnpj Computational Materials, Vol 7, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492 Computer software QA76.75-76.765
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Computer software QA76.75-76.765 Lanxia Hao Yali Yang Yu Huan Hongbo Cheng Yu-Yao Zhao Yingying Wang Jing Yan Wei Ren Jun Ouyang Achieving a high dielectric tunability in strain-engineered tetragonal K0.5Na0.5NbO3 films
description	Abstract Using a modified Landau-Devonshire type thermodynamic potential, we show that dielectric tunability η of a tetragonal ferroelectric film can be analytically solved. At a given electric field E, η is a function of the remnant polarization ( $$P_0^f$$ P 0 f ) and the small-field relative dielectric permittivity ( $$\chi _0^f$$ χ 0 f ), which are commonly measured material properties. After a survey of materials, a large η~80% is predicted to be achievable in a (001)-oriented tetragonal (K0.5,Na0.5)NbO3 film. This strain-stabilized tetragonal phase is verified by density functional theory (DFT) calculations. (K0.5,Na0.5)NbO3 films based on this design were successfully prepared via a sputtering deposition process on SrRuO3-buffered (100)SrTiO3 substrates. The resulted epitaxial films showed a sizable $$P_0^f$$ P 0 f (~0.21C m−2) and a large $$\chi _0^f$$ χ 0 f (~830–860), as well as a large η close to the theoretical value. The measured dielectric tunabilities as functions of E are well described by the theoretical η(E) curves, validating our integrated approach rooted in a theoretical understanding.
format	article
author	Lanxia Hao Yali Yang Yu Huan Hongbo Cheng Yu-Yao Zhao Yingying Wang Jing Yan Wei Ren Jun Ouyang
author_facet	Lanxia Hao Yali Yang Yu Huan Hongbo Cheng Yu-Yao Zhao Yingying Wang Jing Yan Wei Ren Jun Ouyang
author_sort	Lanxia Hao
title	Achieving a high dielectric tunability in strain-engineered tetragonal K0.5Na0.5NbO3 films
title_short	Achieving a high dielectric tunability in strain-engineered tetragonal K0.5Na0.5NbO3 films
title_full	Achieving a high dielectric tunability in strain-engineered tetragonal K0.5Na0.5NbO3 films
title_fullStr	Achieving a high dielectric tunability in strain-engineered tetragonal K0.5Na0.5NbO3 films
title_full_unstemmed	Achieving a high dielectric tunability in strain-engineered tetragonal K0.5Na0.5NbO3 films
title_sort	achieving a high dielectric tunability in strain-engineered tetragonal k0.5na0.5nbo3 films
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/445528dad3294ddd8f0563b9b1a5f2d3
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Achieving a high dielectric tunability in strain-engineered tetragonal K0.5Na0.5NbO3 films

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