Molecular Design for Tailoring a Single-Source Precursor for Bismuth Ferrite

Nearly phase-pure bismuth ferrite particles were formed by thermolysis of the single-source precursor [Cp­(CO)2FeBi­(OAc)2] (1) in octadecene at 245 °C, followed by subsequent calcination at 600 °C for 3 h. In contrast, the slightly modified compound [Cp­(CO)2FeBi­(O2CtBu)2] (2) yielded only mixtures of different bismuth oxide phases, revealing the distinctive influence of molecular design in material synthesis. The chemical composition, morphology, and crystallinity of the resulting materials were investigated by X-ray diffraction, transmission electron microscopy, and energy-dispersive X-ray spectroscopy. In addition, the optical properties were investigated by Fourier transform infrared and UV–vis spectroscopies, showing a strong band gap absorption in the visible range at 590 nm (2.2 eV). The magnetic behavior was probed by vibrating-sample and superconducting quantum interference device magnetometry, as well as 57Fe Mössbauer spectroscopy.近乎物相纯的铁酸铋颗粒可通过如下方法制备：于245 ℃的十八烯溶剂中，对单源前驱体[Cp(CO)2FeBi(OAc)2]（1）进行热解，随后在600 ℃下煅烧3小时。与之对照，经小幅修饰的前驱体化合物[Cp(CO)2FeBi(O2CtBu)2]（2）仅得到不同氧化铋物相的混合物，该结果揭示了分子设计对材料合成的独特调控作用。研究人员借助X射线衍射（X-ray diffraction）、透射电子显微镜（transmission electron microscopy）与能量色散X射线光谱（energy-dispersive X-ray spectroscopy），对所得材料的化学成分、形貌及结晶度进行了表征。此外，通过傅里叶变换红外光谱与紫外-可见光谱对其光学性能展开研究，结果显示该材料在590 nm（2.2 eV）的可见光波段存在强烈的带隙吸收。磁学性能则通过振动样品磁强计、超导量子干涉器件磁测法以及57Fe穆斯堡尔光谱进行了探究。