Ghozza M H, Mosleh Ahmed T, Kamoun Elbadawy A, Abdel-Aty Mahmoud, Alfiras M, Ahmed Mohamed Hafez, Alkhazaleh Shawkat, Ganesh V, Zahran H Y, Yahia Ibrahim S
Basic Science Department, Cairo Higher Institute for Engineering, Computer Science and Management, New Cairo, Egypt.
Nanotechnology Section, Egyptian Company for Carbon Materials, El-Sheraton/El-Nozha, Cairo 11757, Egypt.
Phys Chem Chem Phys. 2025 Jan 15;27(3):1447-1458. doi: 10.1039/d4cp04515g.
Nanostructured bismuth ferrite (BiFeO) single-phase nanoparticles with 76.2% crystallinity and 100% perovskite structure were synthesized using a co-precipitation method. The X-ray diffraction pattern confirmed the perovskite structure of BFO, and Rietveld refinement demonstrated the presence of a triclinic structure with the 1 space group. The Scherrer and Williamson-Hall equations were used to calculate the crystallite size (63 and 83 nm, respectively) with a grain size of almost 246 nm and an activation energy of 0.53 eV. The accumulation of free charges at interfaces, which correlate with the sample bulk and the interface between the compound and electrode space-charge polarization, was the reason behind the high values of '. As the frequency increased up to 1000 Hz, both dielectric constant ' and dielectric loss ' fell quickly. In contrast, at high frequencies, the ' became more frequency-independent, notably when ' increased with a temperature of up to 423 K. The sample exhibited considerable soft ferromagnetic-like activity due to the acquired nanoscale structure that promotes spin coating in the BiFeO antiferromagnetic phase. The significant coercivity 2624.5 Oe provides each materials in permanent magnetic and transformers. Photocatalytic activity of the BiFeO nanocomposite under UVA-light irradiation was performed using Congo red dye. The maximum photocatalytic degradation efficiency after 200 min for CR was 66%. The exceptional electrical and magnetic characteristics of nanostructured BiFeO provide new possibilities for its use in potential technological applications, , spintronics, data storage microelectronics, and water treatment.
采用共沉淀法合成了具有76.2%结晶度和100%钙钛矿结构的纳米结构铋铁氧体（BiFeO）单相纳米颗粒。X射线衍射图谱证实了BFO的钙钛矿结构，Rietveld精修表明存在具有1空间群的三斜结构。使用Scherrer和Williamson-Hall方程计算微晶尺寸（分别为63和83 nm），晶粒尺寸约为246 nm，活化能为0.53 eV。界面处自由电荷的积累与样品本体以及化合物与电极之间的界面空间电荷极化相关，这是‘值较高的原因。随着频率增加到1000 Hz，介电常数‘和介电损耗‘均迅速下降。相比之下，在高频时，‘变得更与频率无关，特别是当‘随温度升高至423 K而增加时。由于所获得的促进BiFeO反铁磁相中自旋涂层的纳米级结构，该样品表现出相当大的类软铁磁活性。显著的矫顽力2624.5 Oe为永磁体和变压器中的每种材料提供了条件。使用刚果红染料对BiFeO纳米复合材料在紫外光照射下的光催化活性进行了测试。200分钟后CR的最大光催化降解效率为66%。纳米结构BiFeO的优异电学和磁学特性为其在潜在技术应用（如自旋电子学、数据存储微电子学和水处理）中的使用提供了新的可能性。
