The formation of ZrB2 nanoparticles through reaction of Zr(n-PrO)4 with H3BO3 and carbon has been studied with different ligands by carbothermal reduction at 1500 °C. In the first step, by introducing N,N′-bis (salicylidene)-1,3-diaminopropane (H2salpn) or salicylaldehyde (Hsal) species into reaction mixture, the reaction of the zirconium alkoxide using citric acid and boric acid yielded the zirconium diboride (ZrB2) sol–gel precursors. In the second step, the mixture was heated by introducing the reactant compact into an argon furnace held at 1500 °C for 2 h to obtain the final purephase ZrB2 nanocrystallites with a diameter of about 50 nm. The kind of chelating agent used in the preparation of ZrB2 nanoparticles plays the predominant role on the final product size. This demonstrates that the proper kind of donor atom and a very specific ligand structure are necessary for the reaction of Zr4+ complexes.
通过在 1500 °C 下进行碳热还原,研究了不同
配体与 Zr(n-PrO)4 和 H3BO3 以及碳反应生成 ZrB2 纳米粒子的过程。第一步,在反应混合物中引入 N,N′-双(亚
水杨醛)-1,3-二
氨基
丙烷(H2salpn)或
水杨醛(Hsal),
氧化锆与
柠檬酸和
硼酸反应生成二
硼化锆(ZrB2)溶胶凝胶前体。在第二步中,将反应物密实地引入 1500 °C 的
氩炉中加热 2 小时,最终得到直径约为 50 nm 的纯相 ZrB2 纳米晶。制备 ZrB2 纳米粒子时使用的
螯合剂种类对最终产品的尺寸起着主导作用。这表明,Zr4+络合物的反应需要适当种类的供体原子和非常特殊的
配体结构。