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Chin. Phys. B, 2019, Vol. 28(5): 057701    DOI: 10.1088/1674-1056/28/5/057701
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Structure instability-induced high dielectric properties in[001]-oriented 0.68Pb(Mg1/3Nb2/3)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
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(Mg1/3Nb2/3)O3-0.33PbTiO3 (PMN-33PT) crystal. The experimental results reveal that a short-range ordered monoclinic MA is the dominant phase at ambient temperature. As the temperature drops below 270 K, the MA transforms into monoclinic MC, and the MC 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.
Keywords:  ferroelectric crystal      phase transition      local structure      dielectric properties  
Received:  17 January 2019      Revised:  21 February 2019      Published:  05 May 2019
PACS:  77.84.-s (Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)  
  77.80.B- (Phase transitions and Curie point)  
  75.78.Fg (Dynamics of domain structures)  
  87.19.rf (Dielectric properties)  
Fund: 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).
Corresponding Authors:  Xiao-Juan Li     E-mail:  lixiaojuan28@163.com

Cite this article: 

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(Mg1/3Nb2/3)O3-0.33PbTiO3 crystals 2019 Chin. Phys. B 28 057701

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