Dielectric and ferroelectric properties of Sr4CaSmTi3Nb7O30 with tetragonal tungsten bronze structure

doi:10.1088/1674-1056/23/9/097701

Abstract Sr₄CaSmTi₃Nb₇O₃₀ ceramics are synthesized and indexed as tetragonal tungsten bronze structure. The dielectric behavior and ferroelectric nature are investigated. Three dielectric anomalies are observed. The phase transition is a displacive phase transition with some diffusive characteristics, which indicates possible compositional variations within the materials on the microscopic scale. The weak distortion disappears in cooling process for differential scanning calorimetry measurement, and the large depression of Curie-Weiss temperature T₀ indicates the difficulty in forming macroferroelectric domain. The ferroelectric nature in these filled tungsten bronze niobates originates from the off-center displacement of B-site cations, but they are primarily dominated by A-site cation occupation. Both the radius and the valence of A1-site cations play an important role on ferroelectric properties of the filled tungsten bronze compounds. Existence of spontaneous polarization with a remanent polarization of 0.16 μC/cm² a coercive field of E_c=11.74 kV/cm confirms the room-temperature ferroelectric nature of Sr₄CaSmTi₃Nb₇O₃₀ ceramics.

Keywords: dielectric phase transition ferroelectric relaxation

Received: 03 January 2014
Revised: 04 March 2014
Accepted manuscript online:

PACS:	77.22.-d	(Dielectric properties of solids and liquids)
	77.80.B-	(Phase transitions and Curie point)
	77.80.-e	(Ferroelectricity and antiferroelectricity)
	77.22.Gm	(Dielectric loss and relaxation)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11174092 and 51002060).

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

Cite this article:

Gong Gao-Shang (龚高尚), Fang Yu-Jiao (方玉娇), Huang Shuai (黄帅), Yin Chong-Yang (尹重阳), Yuan Song-Liu (袁松柳), Wang Li-Guang (王丽光) Dielectric and ferroelectric properties of Sr₄CaSmTi₃Nb₇O₃₀ with tetragonal tungsten bronze structure 2014 Chin. Phys. B 23 097701

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Dielectric and ferroelectric properties of Sr4CaSmTi3Nb7O30 with tetragonal tungsten bronze structure

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Dielectric and ferroelectric properties of Sr₄CaSmTi₃Nb₇O₃₀ with tetragonal tungsten bronze structure