| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Effect of external electric field on crystalline structure anddielectric properties of Bi1.5MgNb1.5O7 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 |
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Abstract Bismuth-based cubic pyrochlore materials have attractive dielectric properties, especially dielectric tunability. The Bi1.5MgNb1.5O7 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.
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Received: 16 March 2021
Revised: 03 June 2021
Accepted manuscript online: 11 June 2021
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PACS:
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77.84.-s
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(Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)
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77.84.Ek
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(Niobates and tantalates)
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77.22.-d
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(Dielectric properties of solids and liquids)
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31.15.es
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(Applications of density-functional theory (e.g., to electronic structure and stability; defect formation; dielectric properties, susceptibilities; viscoelastic coefficients; Rydberg transition frequencies))
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| Fund: 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). |
Corresponding Authors:
Libin Gao, Jihua Zhang
E-mail: biner167@sina.com;jhzhang@uestc.edu.cn
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Cite this article:
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 Bi1.5MgNb1.5O7 thin films 2021 Chin. Phys. B 30 107703
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