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Title: 相扩散阻挡法制备铁酸钴/改性钛酸铋钠0-3复合多铁性陶瓷 = Fabrication of the cobalt ferrite/modified sodium bismuth titanate 0-3 multiferroic composites via diffusion-blocking
Authors: Han, Quanwei (韓權威)
Li, Kun (李坤)
Peng, Song (彭松)
Wang, Yu (王雨)
Chan, Helen L. W. (陳王麗華)
Subjects: Magnetoelectric
0-3 composite
Issue Date: May-2011
Publisher: 科學出版社 = Science Press
Source: 无机材料学报 = Journal of inorganic materials, May 2011, v. 26, no. 5, p. 486-490.
Abstract: 通过溶胶−凝胶工艺在CoFe₂O₄(简称CFO)粉体表面包覆二氧化锆陶瓷层来阻挡烧结过程中铁磁相与铁电 相之间的离子扩散. 包覆后的CFO 与0.92(Bi₀.₅Na₀.₅)TiO₃-0.02(Bi₀.₅K₀.₅)TO₃-0.06BaTiO₃(简称BNBT) 陶瓷粉体分别 按照xCFO/(1−x) BNKLABT (质量分数x = 0.05、0.10、0.15、0.20、0.25、0.30)混合均匀, 并用聚乙烯醇为粘结剂 模压成圆片; 再经过1050℃烧结制备了铁磁/铁电0-3 型复合材料. XRD 分析表明: 二氧化锆在高温烧结过程中对 离子扩散具有良好的阻挡作用. 复合陶瓷的耐击穿电压大于75kV/cm. 测量结果表明: 复合陶瓷的压电应变常数、 机电耦合系数、介电常数和剩余极化随CFO 含量的增加而降低; 磁电耦合系数、介电损耗随CFO 含量的增加而有 所增大. φ35mm×1.5mm 的复合陶瓷样品(x=0.05)在谐振频率(90kHz)和199kA/m 偏置磁场下的磁电系数为 1.39V/A.
The ZrO₂ buffer layer was coated on CoFe₂O₄(CFO) powder via a Sol-Gel method. The coated CFO and 0.92(Bi₀.₅Na₀.₅)TiO₃-0.02(Bi₀.₅K₀.₅)TiO₃-0.06BaTiO₃ (BNBT) ceramic powder were mixed according to the chemical for-mula of xCFO/(1-x) BNBT (weight fraction x = 0.05, 0.10, 0.15, 0.20, 0.25, 0.30). Using polyvinyl alcohol (PVA) as binder, the mixture was pressed into disks. After sintered at 1050℃, the xCFO/(1-x) BNBT 0-3 composite ce-ramic disks were prepared. The X-ray diffraction results show that the ZrO₂ layer can buffer the Fe³⁺ and Co²⁺ ions diffusing from CFO to BNBT during the sintering process. The break-down voltage of the co-fired composites is measured to be 75kV/cm. It is found that the piezoelectric con-stant, electromechanical coefficient, remnant polarization and dielectric permittivity decrease as the CFO content increasing. Magnetoelectric coefficient (ME) and dielectric loss increase with the CFO content increasing. For a composite disk with dimension of f35mm×1.5mm, the ME coefficient at resonance frequency of 90 kHz is 1.39V/A under a DC magnetic bias of 199 kA/m.
Rights: Copyright by Science Press. Reproduced with permission of the publisher.
Type: Journal/Magazine Article
DOI: 10.3724/SP.J.1077.2011.00486
ISSN: 1000-324X
Appears in Collections:AP Journal/Magazine Articles

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