Among the energetic mixtures, one category are thermites. Thermites are highly reactive composites described as consisting of a fuel (metal) and an oxidizer (metal oxide) at micron scale. The use of nano-sized reactants, with higher surface area to volume ratio than micron-sized counterparts, considerably increases reactive properties and consequently raises their interest. The present work expands on this aspect by investigating two thermites mixtures, nano-aluminium (Al) with niobium (V) and tantalum (V) oxides. These oxidizers were selected based on their weak reactive character at micron-scale. The reactants and their respective derived energetic nanocomposites were characterized by X-ray diffraction, scanning electron microscopy coupled to energy dispersive scattering, nitrogen sorption, and energetic performance (sensitivity, combustion reaction). The reactive properties of both energetic systems were evidenced due to the nanostructuring of the two transitional metal oxides. The use of Nb₂O₅ and Ta₂O₅ as oxidizers in gasless nanothermites is demonstrated for the first time.

在高能混合物中，一类是铝热剂。铝热剂是一种高反应性复合材料，由微米级的燃料（金属）和氧化剂（金属氧化物）组成。纳米级反应物的使用比微米级反应物具有更高的表面积与体积比，大大提高了反应性能，从而引起了他们的兴趣。目前的工作通过研究两种铝热剂混合物，即纳米铝 (Al) 与铌 (V) 和钽 (V) 氧化物，在这方面进行了扩展。这些氧化剂的选择是基于它们在微米级的弱反应特性。反应物及其各自衍生的高能纳米复合材料通过 X 射线衍射、扫描电子显微镜与能量色散散射、氮吸附和高能性能（灵敏度、燃烧反应）。由于两种过渡金属氧化物的纳米结构，证明了两种高能系统的反应特性。铌的用途₂ O ₅和Ta ₂ O ₅作为无气纳米铝热剂中的氧化剂首次被证明。