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Room-temperature creep of LaCoO_3-based perovskites: Equilibrium strain under compression

机译:LaCoO_3基钙钛矿的室温蠕变:压缩下的平衡应变

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This study concerns an experimental investigation of room-temperature creep at different stresses in poly-crystalline LaCoO_3-based oxides under compression. A phenomenological approach for ferroelastic creep is proposed to identify the most important parameters that affect creep strain over different time periods. An analytical expression is obtained instead of the previously used power law, allowing an estimation of equilibrium strain at constant stress. An expression is also proposed to calculate the characteristic time of creep and recovery processes. The equilibrium creep diagrams for LaCoO_3 and La_(0.8)Ca_(0.2)CoO_3 perovskites have been determined.
机译:这项研究涉及在压缩下多晶LaCoO_3基氧化物在不同应力下的室温蠕变的实验研究。提出了一种用于铁弹性蠕变的现象学方法,以识别影响不同时间段的蠕变应变的最重要参数。获得了一个解析表达式来代替以前使用的幂定律,从而可以估算恒定应力下的平衡应变。还提出了一个表达式来计算蠕变和恢复过程的特征时间。已经确定了LaCoO_3和La_(0.8)Ca_(0.2)CoO_3钙钛矿的平衡蠕变图。

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