Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, Hunan Province, P. R. China.
Nanoscale. 2013 Oct 21;5(20):10000-6. doi: 10.1039/c3nr02291a.
Homogenously dispersed Fe and Ni nanoparticles (NPs) are introduced into boron nitride (BN) by pyrolysis of cured borazine containing soluble ferrocene or nickelocene. The crystallization of the borazine-derived BN is significantly improved by using no more than 1 wt% NPs. X-ray diffraction (XRD) suggests that the improved BN obtained at 1200 °C exhibits a higher degree of crystallization close to that obtained at 1600 °C without additives. Transmission electron microscopy (TEM) indicates the formation of Fe or Ni NP-core multilayer BN spheres embedded in amorphous BN, and a corresponding core-shell model is suggested. The Ni NPs exhibit a higher crystallization than Fe NPs, possibly due to the higher solubility of boron in Ni NPs at elevated temperatures. In addition, we discuss the mechanisms by which Fe and Ni NPs improve the crystallization of BN from borazine.
通过热解含可溶性二茂铁或环戊二烯基镍的聚硼氮烷，将均匀分散的铁和镍纳米颗粒（NPs）引入氮化硼（BN）中。使用不超过 1wt%的 NPs，可显著提高硼氮烷衍生 BN 的结晶度。X 射线衍射（XRD）表明，在 1200°C 下获得的改进 BN 具有更高的结晶度，接近于在没有添加剂的情况下在 1600°C 下获得的结晶度。透射电子显微镜（TEM）表明形成了嵌入在非晶 BN 中的 Fe 或 Ni NP-核多层 BN 球，并且提出了相应的核壳模型。Ni NPs 的结晶度高于 Fe NPs，这可能是由于在高温下 Ni NPs 中硼的溶解度更高。此外，我们还讨论了 Fe 和 Ni NPs 从硼氮烷促进 BN 结晶的机制。
