Superconductivity and mechanical properties for LaFe1-xZnxAsO0.85F0.15

作者：Pei Yanling; Berardan David^*; Dragoe Nita; Barreteau Celine; Sui Jiehe; Zhao Li Dong

来源：Journal of Alloys and Compounds, 2013, 563: 261-263.

DOI：10.1016/j.jallcom.2013.02.104

• Superconductor
• LaFeAsO
• Composite
• Mechanical properties

LaFe1-xZnxAsO0.85F0.15 composites were synthesized by solid state reaction in order to improve the mechanical properties while trying to keep the superconductivity. XRD results indicate that LaFe1-xZnxAsO0.85F0.15 are series of superconducting composites composed of LaFeAsO0.85F0.15 and LaZnAsO0.85F0.15. LaFe1-xZnxAsO0.85F0.15 still exhibits superconductivity up to Zn fraction as high as 80%. The critical temperature T-c slightly decreases from 26.2 K for LaFeAsO0.85F0.15 to 23.9 K for LaFe0.2Zn0.8AsO0.85F0.15, which means that the superconductivity can be maintained if 20% of the superconducting phase exists in the composite. In addition, the mechanical properties of LaFe1-xZnxAsO0.85F0.15 including micro-hardness, Young's modulus and fracture toughness have been significantly improved in the composite as compared to the Zn free sample. Therefore, we conclude the mechanical properties of the LaFeAsO system, and by extension of other systems, can be enhanced by introducing a second phase without deteriorating the superconductivity.

• 出版日期2013-6-25
• 单位北京航空航天大学