Mn and Bi nanoparticles were synthesized by a wet chemistry reduction process. The as-synthesized Mn and Bi nanoparticles were mixed in hexane with the molar ratio of 1 to 1, and annealed at 250 ^oC in an inert gas environment. In four parallel experiments, the annealing time was controlled to be 2, 4, 6, and 8 hours. The impacts of annealing time on product morphology, crystallization, and magnetic properties were investigated. The results showed that within 6 hours annealing, an increased annealing time resulted in more sintering among the particles in the products, enhanced crystallization, and improved magnetic properties. When the annealing time exceeded 6 hours, further annealing did not bring much difference in morphology, crystallization, and magnetic properties, indicating a thermally stable state of the product.

通过湿化学还原工艺合成了Mn和Bi纳米颗粒。将合成后的Mn和Bi纳米颗粒以1：1的摩尔比在己烷中混合，并在250 ^o退火C在惰性气体环境中。在四个平行实验中，将退火时间控制为2、4、6和8小时。研究了退火时间对产品形态，结晶和磁性能的影响。结果表明，在退火的6小时内，增加的退火时间导致产物中颗粒之间的烧结更多，结晶增强和磁性能提高。当退火时间超过6小时时，进一步的退火在形态，结晶和磁性方面没有带来太大的差异，表明产物的热稳定状态。