Structural analysis and electrical properties of ME composites
Structural analysis and electrical properties of ME composites
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DOI：
10.1016/j.jallcom.2006.12.147
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发表时间：
2008-04
影响因子：
6.2
通讯作者：
S. Lokare;R. Devan;B. K. Chougule
中科院分区：
文献类型：
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作者：
S. Lokare;R. Devan;B. K. Chougule
磁电（ME）复合材料是通过磁致伸缩相与压电相结合而获得磁电输出。采用标准双烧结陶瓷法制备了通式为（x）BaTiO3+（1−x）Ni0.92Co0.03Mn0.05Fe2O4的磁电复合材料，其中x分别为0.85、0.70和0.55。进行结构分析以确认复合材料中存在两相。测量直流电阻率 (ρdc) 作为 300–800K 范围内温度的函数。电阻率随温度的变化显示出半导体行为。研究了100Hz~1MHz频率范围内介电常数和介电损耗的变化。传导是在小极化子模型的基础上解释的。借助交流电导率测量证实了这一现象。进行磁滞测量以确定饱和磁化强度 (Ms) 和矫顽力 (Hc)。饱和磁化强度和磁矩 (μB) 的变化用成分来解释。测量静态磁电转换因子 (dE/dH) 作为直流磁场的函数。 dE/dH 的最大值为 354μV/cm。 Oe 为 x=0.85 的复合材料。
The magnetoelectric (ME) composites are obtained by binding a magnetostrictive phase with piezoelectric phase so as to obtain the magnetoelectric output. The magnetoelectric composites with a general formula (x) BaTiO3+ (1−x) Ni0.92Co0.03Mn0.05Fe2O4in which x varies as 0.85, 0.70 and 0.55 were prepared by standard double sintering ceramic method. The structural analysis was carried out to confirm the presence of two phases in composites. The dc resistivity (ρdc) was measured as a function of temperature in the range 300–800K. The variation of resistivity with temperature shows semiconducting behaviour. The variation of dielectric constant and dielectric loss in the frequency range 100Hz–1MHz was studied. The conduction is explained on the basis of small polaron model. The confirmation of this phenomenon was made with the help of ac conductivity measurements. The hysteresis measurements were carried out to determine saturation magnetization (Ms) and coercivity (Hc). The variation of saturation magnetization and magnetic moment (μB) is interpreted in terms of composition. The static magnetoelectric conversion factor (dE/dH) was measured as a function of dc magnetic field. The maximum value of dE/dH was found to be 354μV/cm. Oe for a composite with x=0.85.