The influences of lattice distortion on the antiferroelectric transition and relaxation of oxygen vacancies in high-entropy perovskites (Bi0.2Na0.2Ba0.2K0.2X0.2)TiO3 with X=Ca, Sr or La

Wentao Yang; Zhuo Han; Guangping Zheng

doi:10.1016/j.scriptamat.2021.114096

The influences of lattice distortion on the antiferroelectric transition and relaxation of oxygen vacancies in high-entropy perovskites (Bi_0.2Na_0.2Ba_0.2K_0.2X_0.2)TiO₃ with X=Ca, Sr or La

Wentao Yang, Zhuo Han, Guangping Zheng

Research output: Journal article publication › Journal article › Academic research › peer-review

30 Citations (Scopus)

Abstract

High entropy ceramics (HECs) (Bi_0.2Na_0.2Ba_0.2K_0.2X_0.2)TiO₃, X=Ca, Sr or La, with a perovskite structure have been successfully synthesized using a modified citrate acid method. Lattice distortion is a main feature of the HECs which significantly influences their antiferroelectric phase transition behaviors. It is shown that the activation energy of oxygen-vacancy relaxation could quantitatively reflect the lattice distortion of perovskite HECs, as characterized by X-ray diffraction, dynamical mechanical analysis and Raman spectroscopy. Based on the activation energy, the lattice-distortion driven antiferroelectric transition in HECs can be also characterized, providing a viable strategy to design the structural, dielectric and ferroelectric properties as finely tuned by chemical disorder at A or B site in perovskite HECs.

Original language	English
Article number	114096
Journal	Scripta Materialia
Volume	203
DOIs	https://doi.org/10.1016/j.scriptamat.2021.114096
Publication status	Published - Oct 2021

Keywords

Anelastic relaxation
High entropy ceramics
Lattice distortion
Oxygen vacancies
Perovskite

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

More information

10.1016/j.scriptamat.2021.114096

Cite this

@article{ba2e3ccdffa4407693f8857829acee53,

title = "The influences of lattice distortion on the antiferroelectric transition and relaxation of oxygen vacancies in high-entropy perovskites (Bi0.2Na0.2Ba0.2K0.2X0.2)TiO3 with X=Ca, Sr or La",

abstract = "High entropy ceramics (HECs) (Bi0.2Na0.2Ba0.2K0.2X0.2)TiO3, X=Ca, Sr or La, with a perovskite structure have been successfully synthesized using a modified citrate acid method. Lattice distortion is a main feature of the HECs which significantly influences their antiferroelectric phase transition behaviors. It is shown that the activation energy of oxygen-vacancy relaxation could quantitatively reflect the lattice distortion of perovskite HECs, as characterized by X-ray diffraction, dynamical mechanical analysis and Raman spectroscopy. Based on the activation energy, the lattice-distortion driven antiferroelectric transition in HECs can be also characterized, providing a viable strategy to design the structural, dielectric and ferroelectric properties as finely tuned by chemical disorder at A or B site in perovskite HECs.",

keywords = "Anelastic relaxation, High entropy ceramics, Lattice distortion, Oxygen vacancies, Perovskite",

author = "Wentao Yang and Zhuo Han and Guangping Zheng",

note = "Funding Information: This work was supported by Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory, China. Publisher Copyright: {\textcopyright} 2021",

year = "2021",

month = oct,

doi = "10.1016/j.scriptamat.2021.114096",

language = "English",

volume = "203",

journal = "Scripta Materialia",

issn = "1359-6462",

publisher = "Acta Materialia Inc",

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The influences of lattice distortion on the antiferroelectric transition and relaxation of oxygen vacancies in high-entropy perovskites (Bi_0.2Na_0.2Ba_0.2K_0.2X_0.2)TiO₃ with X=Ca, Sr or La. / Yang, Wentao; Han, Zhuo; Zheng, Guangping.
In: Scripta Materialia, Vol. 203, 114096, 10.2021.

Research output: Journal article publication › Journal article › Academic research › peer-review

TY - JOUR

T1 - The influences of lattice distortion on the antiferroelectric transition and relaxation of oxygen vacancies in high-entropy perovskites (Bi0.2Na0.2Ba0.2K0.2X0.2)TiO3 with X=Ca, Sr or La

AU - Yang, Wentao

AU - Han, Zhuo

AU - Zheng, Guangping

PY - 2021/10

Y1 - 2021/10

N2 - High entropy ceramics (HECs) (Bi0.2Na0.2Ba0.2K0.2X0.2)TiO3, X=Ca, Sr or La, with a perovskite structure have been successfully synthesized using a modified citrate acid method. Lattice distortion is a main feature of the HECs which significantly influences their antiferroelectric phase transition behaviors. It is shown that the activation energy of oxygen-vacancy relaxation could quantitatively reflect the lattice distortion of perovskite HECs, as characterized by X-ray diffraction, dynamical mechanical analysis and Raman spectroscopy. Based on the activation energy, the lattice-distortion driven antiferroelectric transition in HECs can be also characterized, providing a viable strategy to design the structural, dielectric and ferroelectric properties as finely tuned by chemical disorder at A or B site in perovskite HECs.

AB - High entropy ceramics (HECs) (Bi0.2Na0.2Ba0.2K0.2X0.2)TiO3, X=Ca, Sr or La, with a perovskite structure have been successfully synthesized using a modified citrate acid method. Lattice distortion is a main feature of the HECs which significantly influences their antiferroelectric phase transition behaviors. It is shown that the activation energy of oxygen-vacancy relaxation could quantitatively reflect the lattice distortion of perovskite HECs, as characterized by X-ray diffraction, dynamical mechanical analysis and Raman spectroscopy. Based on the activation energy, the lattice-distortion driven antiferroelectric transition in HECs can be also characterized, providing a viable strategy to design the structural, dielectric and ferroelectric properties as finely tuned by chemical disorder at A or B site in perovskite HECs.

KW - Anelastic relaxation

KW - High entropy ceramics

KW - Lattice distortion

KW - Oxygen vacancies

KW - Perovskite

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DO - 10.1016/j.scriptamat.2021.114096

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