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通过热重分析和差热分析并结合 X射线衍射技术对 Ir O2 +Ta2 O5 混合氧化物的热形成进行了研究。结果表明 :摩尔分数 x<2 5 %时 ,在混合氯盐体系 x H2 Ir Cl6 +(1- x)Ta Cl5 中 ,热解产物中的固溶体为β相 (β- Ta2 O5 中固溶了 Ir组元 ) ;x≥ 2 5 %时 ,生成的固溶体为固溶了 Ta组元的 Ir O2 金红石相 ,而且数量在两个以上 ;只有当 x≥ 42 .86 %时 ,其中的金红石相固溶体才是稳定的。 Ir和 Ta组元在热解过程中相互促进的作用强度顺序为 :x=5 .2 6 % x=6 6 .7%。在低 Ir含量 (x=5 .2 6 % )下或低 Ta含量 (x=6 6 .7% )体系中 ,在高温下主组元的热解受第二组元所抑制
The thermal formation of Ir O2 + Ta2 O5 mixed oxides was investigated by thermogravimetric analysis and differential thermal analysis combined with X-ray diffraction. The results show that the solid solution in the pyrolyzed product is x phase in the mixed chloride system x H2 Ir Cl6 + (1- x) Ta Cl5 when the mole fraction x is less than 25% Element). When x≥25%, the solid solution formed was Ir O2 rutile phase with Ta element dissolved in solution, and its number was more than two. Only when x≥42.86%, the solid solution of rutile phase Is stable. The intensity intensities of the Ir and Ta components that promote each other during the pyrolysis process are: x = 5.26% x = 6 6. 7%. At low Ir (x = 5.26%) or low Ta (x = 6.67%) systems, the pyrolysis of the main component is inhibited by the second component at high temperatures