Dielectric and ferroelectric properties of Sr4CaSmTi3Nb7O30 with tetragonal tungsten bronze structure

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

›› 2014, Vol. 23 ›› Issue (9): 97701-097701.doi: 10.1088/1674-1056/23/9/097701

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Dielectric and ferroelectric properties of Sr₄CaSmTi₃Nb₇O₃₀ with tetragonal tungsten bronze structure

龚高尚, 方玉娇, 黄帅, 尹重阳, 袁松柳, 王丽光

School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China

收稿日期:2014-01-03 修回日期:2014-03-04 出版日期:2014-09-15 发布日期:2014-09-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11174092 and 51002060).

Dielectric and ferroelectric properties of Sr₄CaSmTi₃Nb₇O₃₀ with tetragonal tungsten bronze structure

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)

School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China

Received:2014-01-03 Revised:2014-03-04 Online:2014-09-15 Published:2014-09-15
Contact: Yuan Song-Liu E-mail:yuansl@hust.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11174092 and 51002060).

摘要/Abstract

摘要： 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.

关键词: dielectric, phase transition, ferroelectric, relaxation

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.

Key words: dielectric, phase transition, ferroelectric, relaxation

中图分类号: (Dielectric properties of solids and liquids)

77.22.-d

77.80.B- (Phase transitions and Curie point) 77.80.-e (Ferroelectricity and antiferroelectricity) 77.22.Gm (Dielectric loss and relaxation)

龚高尚, 方玉娇, 黄帅, 尹重阳, 袁松柳, 王丽光. Dielectric and ferroelectric properties of Sr₄CaSmTi₃Nb₇O₃₀ with tetragonal tungsten bronze structure[J]. , 2014, 23(9): 97701-097701.

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[J]. Chin. Phys. B, 2014, 23(9): 97701-097701.

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Dielectric and ferroelectric properties of Sr₄CaSmTi₃Nb₇O₃₀ with tetragonal tungsten bronze structure

Dielectric and ferroelectric properties of Sr₄CaSmTi₃Nb₇O₃₀ with tetragonal tungsten bronze structure

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