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

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.

Keywords: ferroelectric crystal phase transition local structure dielectric properties

Received: 17 January 2019
Revised: 21 February 2019
Accepted manuscript online:

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

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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 2019 Chin. Phys. B 28 057701

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

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