Abstract

Hafnium diboride (HfB₂) nanoparticles have been prepared by a solid-state reaction of hafnium dioxide (HfO₂), metallic magnesium (Mg) and sodium borohydride (NaBH₄) at 700°C in an autoclave. The structure and morphology of the obtained product are investigated by X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The transmission electron microscopy (TEM) image shows that the average size of HfB₂ nanoparticles is about 30 nm. The oxidation behavior of HfB₂ is studied by thermogravimetric analysis (TGA). It has good thermal stability and oxidation resistance below 380°C in air. Furthermore, the possible formation mechanism of HfB₂ is also discussed.

中文翻译：

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二硼化Nano纳米粒子的固相合成与表征

摘要

二氧化ide（HfB ₂）纳米粒子是通过在高压釜中于700°C下使二氧化ha（HfO ₂），金属镁（Mg）和硼氢化钠（NaBH ₄）固态反应制备的。通过X射线粉末衍射（XRD），透射电子显微镜（TEM）和扫描电子显微镜（SEM）研究所得产物的结构和形态。透射电子显微镜（TEM）图像显示HfB ₂纳米粒子的平均大小约为30 nm。通过热重分析（TGA）研究了HfB ₂的氧化行为。在空气中低于380°C时具有良好的热稳定性和抗氧化性。此外，HfB ₂的可能形成机理 也进行了讨论。