Dielectric and relaxor behavior of BaBi4Ti4O15 ceramics

被引：36
作者：
Bobic, J. D. [1 ]
Vijatovic, M. M. [1 ]
Greicius, S. [2 ]
Banys, J. [2 ]
Stojanovic, B. D. [1 ]
机构：
[1] Inst Multidisciplinary Res, Belgrade 11000, Serbia
[2] Vilnius State Univ, Fac Phys, LT-10222 Vilnius, Lithuania
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2010年 / 499卷 / 02期
关键词：
Ceramics; Solid-state reactions; Microstructure; Dielectric response; Impedance spectroscopy; MECHANOCHEMICAL SYNTHESIS; BISMUTH TITANATE; PHASE-TRANSITIONS; BI4TI3O12; ACTIVATION; BA;
D O I：
10.1016/j.jallcom.2010.03.171
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Barium bismuth titanate BaBi4Ti4O15 (BBiT) ceramics have been prepared using non-conventional solid-state reaction route based on mechanochemical synthesis during intensive milling. The X-ray diffraction method was used to determine phase composition. Dielectric properties were investigated in a wide range of temperatures (20-800 degrees C) and frequencies (1.21 kHz-1 MHz). The broad dielectric constant peaks at temperature T-m is frequently dependent. A modified Curie-Weiss relationship is used to study the diffuseness behavior of a ferroelectric phase transition where value of gamma indicates the degree of diffuseness of barium bismuth titanate ceramics. The dielectric relaxation rate follows the Vogel-Fulcher relation with E-a = 0.013 eV, v(0) = 2.09 x 10(8) Hz and T-f = 651 K. All these parameters indicate that BaBi4Ti4O15 is a relaxor ferroelectric. Ohmic conductivities and associated activation energies were evaluated using impedance spectroscopy. (C) 2010 Elsevier B.V. All rights reserved.
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页码：221 / 226
页数：6
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