Considering the challenging conditions imposed by application of membranes in an asymmetric design, in particular creep resistance of the substrate material is an important parameter for the stability in long-term operation. As promising material, in terms of chemical stability, the perovskite SrTi_0.75Fe_0.25O_3-δ has been identified in previous works. Porous supports with different microstructures have been produced using different manufacturing methods and compared to the material in its fully dense state regarding creep behaviour. The creep deformation of pressed, porous tape-cast and freeze-dried SrTi_0.75Fe_0.25O_3-δ specimens has been investigated in the application relevant temperature range of 850–1000 °C under compressive stresses of 15, 30 and 45 MPa. A global fitting method considering all experimental data was used to derive stress exponent and activation energy of SrTi_0.75Fe_0.25O_3-δ, which are 2.9 ± 0.4 and 402 ± 25 kJ/mol, respectively. Thus, it is suggested that the mechanism controlling creep is mainly related to dislocation climb/glide.

考虑到在非对称设计中施加膜所带来的挑战性条件，特别是基材的抗蠕变性是长期运行中稳定性的重要参数。作为有前途的材料，就化学稳定性而言，钙钛矿型SrTi _0.75 Fe _0.25 O3 _-δ在以前的工作中已被确定。已经使用不同的制造方法生产了具有不同微结构的多孔支撑物，并将其与处于完全致密状态的材料的蠕变行为进行了比较。SrTi _0.75 Fe _0.25 O3 _-δ挤压多孔多孔铸造和冻干的蠕变变形在15、30和45 MPa的压缩应力下，在850-1000°C的应用相关温度范围内对样品进行了研究。考虑所有实验数据的整体拟合方法被用来得出SrTi _0.75 Fe _0.25 O3 _-δ的应力指数和活化能，分别为2.9±0.4和402±25 kJ / mol。因此，建议控制蠕变的机制主要与位错爬升/滑移有关。