Electrical analysis of inter-growth structured Bi4Ti3O12–Na0.5Bi4.5Ti4O15 ceramics

doi:10.1088/1674-1056/26/7/077701

Abstract Inter-growth bismuth layer-structured ferroelectrics (BLSFs), Bi₄Ti₃O₁₂–Na_0.5Bi_4.5Ti₄O₁₅ (BIT–NBT), were successfully synthesized using the traditional solid-state reaction method. X-ray diffraction (XRD) Rietveld refinements were conducted using GSAS software. Good agreement and low residual are obtained. The XRD diffraction peaks can be well indexed into I2cm space group. The inter-growth structure was further observed in the high-resolution TEM image. Dielectric and impedance properties were measured and systematically analyzed. At the temperature range 763–923 K (below T_c), doubly ionized oxygen vacancies (OVs) are localized and the short-range hopping leads to the relaxation processes with an activation energy of 0.79–1.01 eV. Above T_c, the doubly charged OVs are delocalized and become free ones, which contribute to the long-range dc conduction. The reduction in relaxation species gives rise to a higher relaxation activation energy~1.6 eV.

Keywords: Bi₄Ti₃O₁₂–Na_0.5Bi_4.5Ti₄O₁₅ impedance spectroscopy oxygen vacancies-related defect dipoles electrical analysis

Received: 15 December 2016
Revised: 02 April 2017
Accepted manuscript online:

PACS:	77.65.Bn	(Piezoelectric and electrostrictive constants)
	77.80.B-	(Phase transitions and Curie point)
	77.84.-s	(Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos.51562014,51262009,and 51602135).

Corresponding Authors: Xingan Jiang, Chao Chen
E-mail: XINGAN.JIANG@Yahoo.com;cc2762@163.com

Cite this article:

Xiangping Jiang(江向平), Yalin Jiang(江亚林), Xingan Jiang(江兴安), Chao Chen(陈超), Na Tu(涂娜), Yunjing Chen(陈云婧) Electrical analysis of inter-growth structured Bi₄Ti₃O₁₂–Na_0.5Bi_4.5Ti₄O₁₅ ceramics 2017 Chin. Phys. B 26 077701

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Electrical analysis of inter-growth structured Bi4Ti3O12–Na0.5Bi4.5Ti4O15 ceramics

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Electrical analysis of inter-growth structured Bi₄Ti₃O₁₂–Na_0.5Bi_4.5Ti₄O₁₅ ceramics