Structure instability-induced high dielectric properties in[001]-oriented 0.68Pb(Mg1/3Nb2/3)O3-0.33PbTiO3 crystals

doi:10.1088/1674-1056/28/5/057701

中国物理B ›› 2019, Vol. 28 ›› Issue (5): 57701-057701.doi: 10.1088/1674-1056/28/5/057701

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Structure instability-induced high dielectric properties in[001]-oriented 0.68Pb(Mg_1/3Nb_2/3)O₃-0.33PbTiO₃ crystals

Xiao-Juan Li(李晓娟), Xing Fan(樊星), Zeng-Zhe Xi(惠增哲), Peng Liu(刘鹏), Wei Long(龙伟), Pin-Yang Fang(方频阳), Rui-Hua Nan(南瑞华)

1 Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021, China;
2 School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710119, China

收稿日期:2019-01-17 修回日期:2019-02-21 出版日期:2019-05-05 发布日期:2019-05-05
通讯作者: Xiao-Juan Li E-mail:lixiaojuan28@163.com
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 51602242 and 51472197) and the Natural Science Basic Research Plan in Shaanxi Province of China (Grant No. 2018JM5097).

Structure instability-induced high dielectric properties in[001]-oriented 0.68Pb(Mg_1/3Nb_2/3)O₃-0.33PbTiO₃ crystals

Xiao-Juan Li(李晓娟)^1,2, Xing Fan(樊星)¹, Zeng-Zhe Xi(惠增哲)¹, Peng Liu(刘鹏)², Wei Long(龙伟)¹, Pin-Yang Fang(方频阳)¹, Rui-Hua Nan(南瑞华)¹

1 Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021, China;
2 School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710119, China

Received:2019-01-17 Revised:2019-02-21 Online:2019-05-05 Published:2019-05-05
Contact: Xiao-Juan Li E-mail:lixiaojuan28@163.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 51602242 and 51472197) and the Natural Science Basic Research Plan in Shaanxi Province of China (Grant No. 2018JM5097).

摘要/Abstract

摘要： The structure evolution and origin of ultrahigh dielectric properties have been investigated in the low temperature range from 300 K to 5 K for[001]-oriented 0.68Pb(Mg_1/3Nb_2/3)O₃-0.33PbTiO₃ (PMN-33PT) crystal. The experimental results reveal that a short-range ordered monoclinic M_A is the dominant phase at ambient temperature. As the temperature drops below 270 K, the M_A transforms into monoclinic M_C, and the M_C remains stable until 5 K. Although no phase transition occurs from 5 K to 245 K, polar nanoregions (PNRs) display visible changes. The instability of PNRs is suggested as responsible for the low temperature relaxation. The ultrahigh dielectric constant at room temperature is associated with the instability of local structure and phase transition. Our research provides an insight into the design of high-performance ferroelectric materials.

关键词: ferroelectric crystal, phase transition, local structure, dielectric properties

Abstract: The structure evolution and origin of ultrahigh dielectric properties have been investigated in the low temperature range from 300 K to 5 K for[001]-oriented 0.68Pb(Mg_1/3Nb_2/3)O₃-0.33PbTiO₃ (PMN-33PT) crystal. The experimental results reveal that a short-range ordered monoclinic M_A is the dominant phase at ambient temperature. As the temperature drops below 270 K, the M_A transforms into monoclinic M_C, and the M_C remains stable until 5 K. Although no phase transition occurs from 5 K to 245 K, polar nanoregions (PNRs) display visible changes. The instability of PNRs is suggested as responsible for the low temperature relaxation. The ultrahigh dielectric constant at room temperature is associated with the instability of local structure and phase transition. Our research provides an insight into the design of high-performance ferroelectric materials.

Key words: ferroelectric crystal, phase transition, local structure, dielectric properties

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

77.84.-s

77.80.B- (Phase transitions and Curie point) 75.78.Fg (Dynamics of domain structures) 87.19.rf (Dielectric properties)

李晓娟, 樊星, 惠增哲, 刘鹏, 龙伟, 方频阳, 南瑞华. Structure instability-induced high dielectric properties in[001]-oriented 0.68Pb(Mg_1/3Nb_2/3)O₃-0.33PbTiO₃ crystals[J]. 中国物理B, 2019, 28(5): 57701-057701.

Xiao-Juan Li(李晓娟), Xing Fan(樊星), Zeng-Zhe Xi(惠增哲), Peng Liu(刘鹏), Wei Long(龙伟), Pin-Yang Fang(方频阳), Rui-Hua Nan(南瑞华). Structure instability-induced high dielectric properties in[001]-oriented 0.68Pb(Mg_1/3Nb_2/3)O₃-0.33PbTiO₃ crystals[J]. Chin. Phys. B, 2019, 28(5): 57701-057701.

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Structure instability-induced high dielectric properties in[001]-oriented 0.68Pb(Mg_1/3Nb_2/3)O₃-0.33PbTiO₃ crystals

Structure instability-induced high dielectric properties in[001]-oriented 0.68Pb(Mg_1/3Nb_2/3)O₃-0.33PbTiO₃ crystals

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