Abstract In this study supported meso-porous gamma-alumina membrane with a thickness of 2.5µm was synthesized on a macro-porous alpha-alumina substrate via colloidal sol-gel route. To evaluate the improvement in the thermal stability of alumina by yttria addition, unsupported alumina membranes with various amounts of yttria (0, 2.5, 5 and 10%mol) were investigated by XRD and TG-DTA analyses. Based on XRD results and considering transitional alumina stabilization effect, the optimum concentration of yttria was determined to be 5%mol. The results of DTA analysis showed that 5%mol yttria addition shifted the gamma to alpha phase transformation to higher temperatures.

中文翻译：

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介孔γ-氧化铝膜的合成：氧化钇添加对热稳定性的影响

摘要 本研究通过胶体溶胶-凝胶途径在大孔α-氧化铝基底上合成了厚度为2.5μm的支撑介孔γ-氧化铝膜。为了评估添加氧化钇对氧化铝热稳定性的改善，通过 XRD 和 TG-DTA 分析研究了具有不同氧化钇量（0、2.5、5 和 10% mol）的无载体氧化铝膜。根据XRD结果并考虑过渡态氧化铝的稳定作用，确定氧化钇的最佳浓度为5%mol。DTA 分析的结果表明，添加 5% mol 氧化钇使 γ 相向 α 相转变转移到更高的温度。