Effects of A1 site occupation on dielectric and ferroelectric properties of Sr4CaRTi3Nb7O30 (R=Ce, Eu) tungsten bronze ceramics

doi:10.1088/1674-1056/23/12/128701

Abstract Sr₄CaRTi₃Nb₇O₃₀ (R=Ce, Eu) tungsten bronze ceramics are prepared by a standard solid state reaction method. The effects of A1 site occupation on the dielectric and ferroelectric properties of Sr₄CaRTi₃Nb₇O₃₀ (R=Ce, Eu) tetragonal tungsten bronzes are investigated. The Sr₄CaCeTi3Nb₇O₃₀ shows a normal transition behavior due to the closer size ion occupation in A1 sites, which could suppress the distortion of B2 octahedra effectively. Sr₄CaEuTi₃Nb₇O₃₀ ceramic exhibits two dielectric anomalies, which might be related to the fact that the large radius difference between Ca²⁺ and Eu³⁺ could lead to the uneven distribution of Ca²⁺ and Eu³⁺ in A1 sites and form two slightly different kinds of compositions with different transition temperatures in the structure. Our results indicate that the ionic radius difference in A1 sites plays an important role in determining the dielectric and ferroelectric natures of the filled tungsten bronze ceramics. Polarization–electric field (P–E) curves are evaluated at room temperature and both of them show hysteresis loops. Sr₄CaCeTi₃Nb₇O₃₀ shows a fat hysteresis loop, indicating the long-range ferroelectric order in the ceramic. The current density–electric field (J–E) curves are measured at room temperature with a largest leakage current density of ～ 10^-6 A/cm², indicating that their leakage currents are rather low.

Keywords: dielectric anomaly relaxation ferroelectricity

Received: 22 May 2014
Revised: 25 June 2014
Accepted manuscript online:

PACS:	87.19.rf	(Dielectric properties)
	31.70.Hq	(Time-dependent phenomena: excitation and relaxation processes, and reaction rates)
	77.84.-s	(Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11174092) and the Key Project of Henan Provincial Educational Committee, China (Grant No. 14A140019).

Corresponding Authors: Yuan Song-Liu
E-mail: yuansl@hust.edu.cn

Cite this article:

Fang Yu-Jiao (方玉娇), Gong Gao-Shang (龚高尚), Gebru Zerihun, Yuan Song-Liu (袁松柳) Effects of A1 site occupation on dielectric and ferroelectric properties of Sr₄CaRTi₃Nb₇O₃₀ (R=Ce, Eu) tungsten bronze ceramics 2014 Chin. Phys. B 23 128701


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Effects of A1 site occupation on dielectric and ferroelectric properties of Sr4CaRTi3Nb7O30 (R=Ce, Eu) tungsten bronze ceramics

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Effects of A1 site occupation on dielectric and ferroelectric properties of Sr₄CaRTi₃Nb₇O₃₀ (R=Ce, Eu) tungsten bronze ceramics