中文摘要：

本文以无水三氯化铝和四氯化钛为前驱体,以无水乙醇为氧供体,以铁粉、三氯化铁和乙醇铁为稳定剂,采用非水解溶胶-凝胶法制备铁稳定钛酸铝粉体。运用XRD、FT-IR和热膨胀仪等测试手段研究和探讨了铁稳定剂对低温合成钛酸铝的效果、稳定作用及其机理。结果表明：引入铁粉既不能提高钛酸铝低温合成效果也不能改善其热稳定性;三氯化铁能促进钛酸铝的低温合成,但其稳定钛酸铝的效果也不明显;乙醇铁虽不利于低温合成钛酸铝,但却能够大大提高钛酸铝的抗热分解能力。乙醇铁能与前驱体混合液中形成的铝、钛醇盐形成异质缩聚键合,致使铁能进入钛酸铝晶格形成固溶体,从而提高其热稳定性能。

英文摘要：

Iron-stabilized aluminum titanate powder was prepared via the non-hydrolytic sol-gel method,using anhydrous aluminum chloride and titanium tetrachloride as precursors,anhydrous ethanol as oxygen donor,iron powder,iron chloride and iron ethoxide as iron stabilizers.The effect of iron stabilizers on the low-temperature synthesis of Al2TiO5 was investigated,and their role and their mechanism in stabilizing Al2TiO5 were also explored by XRD,FT-IR and dilatometer.The results show that iron powder makes no improvement in both the low-temperature synthesis and thermal stability of Al2TiO5;although iron chloride can facilitate the synthesis,it has little effect on the stability;in contrast,iron ethoxide isn＇ t beneficial to the synthesis,but could make great improvement in the thermal decomposition resistance of Al2TiO5.Iron ethoxide could react with the aluminum ethoxide and the titanium ethoxide in the precursor mixed solution to form the heterogeneous bonds,which enables iron enter the lattice of aluminum titanate to form the solid solution.As a result,the thermal stability of Al2TiO5 is improved.