Effect of external electric field on crystalline structure anddielectric properties of Bi1.5MgNb1.5O7 thin films

doi:10.1088/1674-1056/ac0a6b

中国物理B ›› 2021, Vol. 30 ›› Issue (10): 107703-107703.doi: 10.1088/1674-1056/ac0a6b

Effect of external electric field on crystalline structure anddielectric properties of Bi_1.5MgNb_1.5O₇ thin films

Zhongzhe Liu(刘钟喆), Libin Gao(高莉彬)^†, Kexin Liang(梁可欣), Zhen Fang(方针), Hongwei Chen(陈宏伟), and Jihua Zhang(张继华)^‡

State Key Laboratory of Electronic Thin Films and Integrated Devices;School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China

收稿日期:2021-03-16 修回日期:2021-06-03 接受日期:2021-06-11 发布日期:2021-09-17
通讯作者: Libin Gao, Jihua Zhang E-mail:biner167@sina.com;jhzhang@uestc.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 51602037) and the Open Foundation of State Key Laboratory of Electronic Thin Films and Integrated Devices (Grant No. KFJJ201510).

Effect of external electric field on crystalline structure anddielectric properties of Bi_1.5MgNb_1.5O₇ thin films

Zhongzhe Liu(刘钟喆), Libin Gao(高莉彬)^†, Kexin Liang(梁可欣), Zhen Fang(方针), Hongwei Chen(陈宏伟), and Jihua Zhang(张继华)^‡

State Key Laboratory of Electronic Thin Films and Integrated Devices;School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China

Received:2021-03-16 Revised:2021-06-03 Accepted:2021-06-11 Published:2021-09-17
Contact: Libin Gao, Jihua Zhang E-mail:biner167@sina.com;jhzhang@uestc.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 51602037) and the Open Foundation of State Key Laboratory of Electronic Thin Films and Integrated Devices (Grant No. KFJJ201510).

摘要/Abstract

摘要： Bismuth-based cubic pyrochlore materials have attractive dielectric properties, especially dielectric tunability. The Bi_1.5MgNb_1.5O₇ ceramic samples were prepared by solid state reaction. The XRD results and SEM pictures prove the raw material are well mixed and co-fired and the BMN cubic pyrochlore is well crystallized, no second phase was found in the result. BMN thin film were fabricated by depositing BMN ceramic nanoparticles on the sapphire. The BMN thin film has a high dielectric tunability of 43% at a bias voltage of 1.5 MV/cm, with loss tangent lower than 0.009. A Raman study of BMN cubic pyrochlore reveals O'-A-O' and O-A-O bending modes contribute to 80% of dielectric permittivity, obstructing these modes such as applying external electric field can have apparent influence on dielectric constant. Berry Phase calculation results shows that A₂O' tetrahedrons are more easy to distort under an external field. The A-site Mg have the highest displacement (0.765028 Å), followed by A-site Bi cations (0.346317 Å). Compared to zero-bias thin film, the biased one with A-O and A-O' bonds being stretched and external coulomb force applied on cations and anions, the dielectric constant under bias field dramatically decreased.

关键词: cubic pyrochlore, dielectric properties, tunability, DFT calculations

Abstract: Bismuth-based cubic pyrochlore materials have attractive dielectric properties, especially dielectric tunability. The Bi_1.5MgNb_1.5O₇ ceramic samples were prepared by solid state reaction. The XRD results and SEM pictures prove the raw material are well mixed and co-fired and the BMN cubic pyrochlore is well crystallized, no second phase was found in the result. BMN thin film were fabricated by depositing BMN ceramic nanoparticles on the sapphire. The BMN thin film has a high dielectric tunability of 43% at a bias voltage of 1.5 MV/cm, with loss tangent lower than 0.009. A Raman study of BMN cubic pyrochlore reveals O'-A-O' and O-A-O bending modes contribute to 80% of dielectric permittivity, obstructing these modes such as applying external electric field can have apparent influence on dielectric constant. Berry Phase calculation results shows that A₂O' tetrahedrons are more easy to distort under an external field. The A-site Mg have the highest displacement (0.765028 Å), followed by A-site Bi cations (0.346317 Å). Compared to zero-bias thin film, the biased one with A-O and A-O' bonds being stretched and external coulomb force applied on cations and anions, the dielectric constant under bias field dramatically decreased.

Key words: cubic pyrochlore, dielectric properties, tunability, DFT calculations

中图分类号: (Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)

77.84.-s

77.84.Ek (Niobates and tantalates) 77.22.-d (Dielectric properties of solids and liquids) 31.15.es (Applications of density-functional theory (e.g., to electronic structure and stability; defect formation; dielectric properties, susceptibilities; viscoelastic coefficients; Rydberg transition frequencies))

Zhongzhe Liu(刘钟喆), Libin Gao(高莉彬), Kexin Liang(梁可欣), Zhen Fang(方针), Hongwei Chen(陈宏伟), and Jihua Zhang(张继华). Effect of external electric field on crystalline structure anddielectric properties of Bi_1.5MgNb_1.5O₇ thin films[J]. 中国物理B, 2021, 30(10): 107703-107703.

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Effect of external electric field on crystalline structure anddielectric properties of Bi_1.5MgNb_1.5O₇ thin films

Effect of external electric field on crystalline structure anddielectric properties of Bi_1.5MgNb_1.5O₇ thin films

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