Correlation between oxygen vacancy and mechanical properties in oxideunder chemical potential

对于固体氧化物燃料电池（SOFC）的商业化，除了电气可靠性外，确保SOFC的机械可靠性也很重要。因此，在各种温度和氧分压条件下建立合适的力学测试方法是开发可靠SOFCs的前提。本文给出了还原条件下SOFC构件弹性模量和断裂强度的实验研究结果。为了研究高氧化还原环境下固体氧化物燃料电池部件的弹性模量和断裂强度，建立了原位力学试验方法。在还原条件下，弹性模量发生了变化，这种行为很可能是由于非化学计量。结果表明，原位力学测试方法可以估计SOFC单元和堆叠的内应力。

For the commercialization of solid oxide fuel cell (SOFC), in addition to the electrical reliability, it is also important to ensure the mechanical reliability of SOFC. Thus, the establishment of a suitable mechanical testing method under various temperatures and oxygen partial pressure conditions is a prerequisite for the development of reliable SOFCs. This paper presents the experimental results of the investigation of elastic modulus and fracture strength on the SOFC components under reducing conditions. An in-situ mechanical testing method was developed in order to investigate the elastic modulus and fracture strength of solid oxide fuel cells components under high oxidizing/reducing environments. The elastic modulus was shown to change under reducing condition, and the behavior was most likely due to non-stoichiometry. It was demonstrated that the in-situ mechanical testing method enabled us to estimate the internal stress in the SOFC cell and stack.