AI 中文总结
本研究探究HP-HTS工艺对Pr1111的影响，发现其对欠掺杂、最优掺杂组分可提升Tc与显微结构，但过掺杂组分超导性受抑制，其有效性具强组分依赖性，需进一步优化工艺条件。
AI 中文摘要
受近期关于高压（HP）合成处理的多个铁基超导体（IBS）家族超导性能提升的报道启发，本研究采用此前针对其他IBS家族优化的0.5 GPa、1小时的工艺条件，探究了高压气体与高温合成（HP-HTS）工艺对Pr基氧磷族化合物PrFeAsO1-xFx（Pr1111）的结构、显微结构、电输运及磁性能的影响。从Pr1111常压电子相图中选取欠掺杂（x=0.2）、最优掺杂（x=0.3）及过掺杂（x=0.5）的典型组分，以评估HP-HTS对其组分依赖的效应。结果表明，HP-HTS可增强氟的掺入、改善相形成，并在欠掺杂与最优掺杂组分中得到更致密、晶粒连接性更好的显微结构。磁测量显示，x=0.2组分的超导转变温度（Tc）提升约1 K，x=0.3组分的Tc提升约6 K，但临界电流密度仅出现微弱提升；欠掺杂组分的电阻率测量显示Tc略有提升，同时电阻转变更宽，表明存在残留结构不均匀性。与之相反，过掺杂组分出现杂质相偏析增加，伴随超导性被抑制。这些结果表明，HP-HTS在Pr1111中的有效性具有强组分依赖性，由氟掺入、相稳定性与显微结构演化的相互作用决定，凸显了进一步优化HP-HTS工艺条件的必要性。
英文摘要
Motivated by recent reports of enhanced superconducting performance in several families of iron-based superconductors (IBS) processed by high-pressure (HP) synthesis, we investigate the influence of high gas pressure and high-temperature synthesis (HP-HTS) process on the structural, microstructural, electrical transport, and magnetic properties of Pr-based oxypnictide PrFeAsO1-xFx (Pr1111) using the processing conditions of 0.5 GPa for 1 h previously optimized for other IBS families. Representative underdoped (x = 0.2), optimal doped (x = 0.3), and overdoped (x = 0.5) compositions from the ambient-pressure electronic phase diagram of Pr1111 are selected to evaluate its composition-dependent effects of HP-HTS. The results demonstrate that HP-HTS enhances fluorine incorporation, improves phase formation, and produces a denser microstructure with improved grain connectivity in the underdoped and optimal doped compositions. Magnetic measurements reveal increased in the superconducting transition temperature (Tc) of ~1 K for x = 0.2 and ~6 K for x = 0.3, whereas only a marginal improvement in the critical current density is observed. Electrical resistivity measurements of the underdoped composition show a slight increase in Tc accompanied by a broader resistive transition, indicating residual structural inhomogeneity. In contrast, the overdoped composition exhibits increased impurity phase segregation, accompanied by suppression of superconductivity. These results demonstrate that the effectiveness of HP-HTS in Pr1111 is strongly composition dependent and governed by the interplay among fluorine incorporation, phase stability, and microstructural evolution, highlighting the need for further optimization of the HP-HTS processing conditions.
Comments29 pages, 6 Figures
Journal refPhysica C: Superconductivity and its Applications 650, 1354944 (2026)
DOI：10.1016/j.physc.2026.1354944
