Ba、Ti共掺杂BiFeO $_3$块体材料的磁性能与超声法制备的相应纳米粒子的磁性能存在较大差异
Large difference between the magnetic properties of Ba and Ti co-doped BiFeO$_3$ bulk materials and their corresponding nanoparticles prepared by ultrasonication
摘要：
最初通过标准固态反应技术制备标称组成为Bi $_{0.7}$ Ba $_{0.3}$ Fe $_{1-x}$ Ti $_x$ O $_3$（x = 0.00-0.20）的陶瓷粒料。然后将颗粒研磨成微米级粉末，并在超声波浴中与异丙醇混合以制备纳米颗粒。X-射线衍射图表明在散装粉末材料中存在大量的杂质相。有趣的是，由于这些散装粉末材料的超声处理60分钟，这些次级相被完全去除。磁场和温度相关的磁化强度测量显示，块体材料和它们相应的纳米颗粒的磁性之间的显着差异。我们预计，在磁行为的巨大差异可能与存在和不存在的二次杂质相的散装材料和相应的纳米粒子，分别。与散装对应物相比，也发现散装材料的漏电流密度在超声制备的纳米颗粒中被抑制。
英文摘要：
The ceramic pellets of the nominal compositions Bi$_{0.7}$Ba$_{0.3}$Fe$_{1-x}$Ti$_x$O$_3$ (x = 0.00-0.20) were prepared initially by standard solid state reaction technique. The pellets were then ground into micrometer-sized powders and mixed with isopropanol in an ultrasonic bath to prepare nanoparticles. The X-ray diffraction patterns demonstrate the presence of a significant number of impurity phases in bulk powder materials. Interestingly, these secondary phases were completely removed due to the sonication of these bulk powder materials for 60 minutes. The field and temperature dependent magnetization measurements exhibited significant difference between the magnetic properties of the bulk materials and their corresponding nanoparticles. We anticipate that the large difference in the magnetic behavior may be associated with the presence and absence of secondary impurity phases in the bulk materials and their corresponding nanoparticles, respectively. The leakage current density of the bulk materials was also found to suppress in the ultrasonically prepared nanoparticles compared to that of bulk counterparts.
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