Formation and modulation mechanisms of Fe-As phases in melting-processed Ba(Fe1-xCox)2As2 superconductor
Source abstract
Abstract
The Fe-As phases play a crucial role in determining the superconducting properties of iron arsenic-based superconductors. In this study, we employed high-temperature confocal laser scanning microscopy (HT-CLSM) to investigate the formation mechanism of Fe-As phases in the melting processed Ba(Fe 0.92Co 0.08) 2As 2 superconductor through in situ observations. By combining these observations with microstructural and magnetic characterizations, we have confirmed that the high-temperature Fe-As phases primarily originate from the partial incongruent melting of the Ba122 superconducting phase. Moreover, we have elucidated the transition process of the Fe-As liquid and identified two dominant eutectic reactions in normal cooling sample: "L → Fe 2As + FeAs" and "L → Fe 2As + α -Fe". In case of extremely slow cooling rate, a further eutectic reaction between the Fe-As and superconducting phases ("L → Ba122 + Fe 2As + FeAs") occurs, leading to the elimination of α-Fe and an increased volume of non-superconducting phases. We have also analyzed the effects of the Fe-As phases on the magnetic behavior, critical current density, and vortex pinning behavior. This study provides valuable insights for designing the microstructure of new type iron arsenic-based superconductors through the melting process.
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Research context
OpenAlex topics: Iron-based superconductors research · Amyloidosis: Diagnosis, Treatment, Outcomes · Rare-earth and actinide compounds
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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