ABSTRACT

The yttrium (Y)-modified bismuth ferrite (BFO) ceramic compound (i.e. Bi(Fe_0.85Y_0.15)O₃, abbreviated as BFYO15) has been synthesized through a standard solid state reaction technique. The results of its various properties, such as structural, dielectric and electrical features of Y-modified BFO were thoroughly investigated. The analysis of X-ray diffraction data confirms the phase formation of the compound, and shows the structural change from the rhombohedral to orthorhombic crystal system. The calculated average crystallite size of the sample was found to be 42 nm. The detailed studies of the dielectric parameters, impedance and ac-conductivity were performed in a wide frequency range (1–1000 kHz) at different temperatures (25–350°C). All the studies clearly show the significant change in dielectric and other electrical parameters on Y-substitution at the Fe site. Further, some of the results and electrical characteristics of the material may be used to select the material for potential device applications.

摘要

钇（Y）改性的铋铁氧体（BFO）陶瓷化合物（即Bi（Fe _0.85 Y _0.15）O ₃，缩写为BFYO15）已经通过标准的固态反应技术合成。彻底研究了其各种性质的结果，例如Y改性BFO的结构，介电和电学特性。X射线衍射数据分析证实了化合物的相形成，并显示了从菱面体到正交晶体系统的结构变化。发现样品的计算的平均微晶尺寸为42nm。在不同的温度（25–350°C）下，在较宽的频率范围（1–1000 kHz）中进行了介电参数，阻抗和交流电导率的详细研究。所有研究清楚地表明，在Fe位点的Y取代介电常数和其他电参数发生了显着变化。进一步，