采用正硅酸乙酯的sol-gel法和RuCl_3的Pechini法结合,制备了70 mol% RuO_2 -30 mol% SiO_2二元氧化物粉末.采用红外光谱(FT-IR)、综合热分析、X射线衍射(XRD)、TEM和比表面(BET)等测试技术研究了产物的形成过程和组织结构.结果表明,晶体颗粒尺寸约为10nm.在200 ～ 600℃范围内,SiO_2都保持非晶结构.200℃、400℃烧结的样品中晶体只有单质Ru.600℃时,90 vol%的Ru被氧化为颗粒大小与Ru单质相当的RuO_2.400℃烧结的样品比表面积最大,孔径最小.非晶SiO_2可以有效阻止颗粒尺寸长大.这对于钛阳极涂层的制备非常有利.
Nanometer 70 mol% RuO_2-30mol% SiO_2 powders were synthesized by sol-gel method using tetraethylorthosilicate (TEOS) and citrate-gel method using RuCl_3.The structure of the powders were characterized by means of FT-IR.DTA-TG, XRD, TEM and BET method.It is shown that the size of the powders particles is about 10 nm.Amorphous SiO_2 exists in the range of experimental temperature.Only crystalline Ru metal exiats in the powders calcined at 200 and 400℃.90vol% Ru it oxidated into RuO_2 with has the same size as Ru for the powders calcined at 600 ℃.The powders calcained at 400 ℃ present superior thermal properties.The phases of the powders can be effectively controlled by adding SiO_2, and it is favorable for the preparation of Ti anodes.
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