Abstract
A novel room-temperature chemical synthesis technique for PbO-type FeSe superconducting nanocrystals was developed. Since no heat treatment was involved during the reaction process, the formation of non-superconducting hexagonal δ-FeSe phase has been effectively avoided and high purity of superconducting phase was guaranteed, which were proved by both X-ray diffractometer (XRD) and high-resolution transmission electron microscope (HRTEM). FeSe nanoparticles with the critical temperature, Tc of ∼ 8.9 K were obtained, which implied the effectiveness of this synthesis method. The influences of pH values on the morphology of FeSe nanoparticles and the reaction mechanisms were systematically analyzed. With the increase of pH values, the particle size decreased obviously. The reaction mechanisms with different pH values were also discussed based on the observed experimental phenomena and calculated standard electrode potentials.
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Acknowledgments
The author would like to appreciate the valuable help from ZhuGuo Chang from China Northwest University on SQUID measurement, and Shengwu Guo from Xi’an Jiaotong University on HRTEM. This research was financially supported by National “973” Project, under contract no. 2011CBA00104, National Natural Science Foundation of China under contract no. 51102198 and 51302223 the national ITER program of China under contract no. 2013GB110001, and the Innovative Research Team of Shaanxi province under contract no. 2013KCT-07.
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Li, C., Zhang, S., Yu, Z. et al. Room-Temperature Chemical Synthesis of PbO-Type FeSe Superconducting Nanoparticles. J Supercond Nov Magn 28, 1449–1453 (2015). https://doi.org/10.1007/s10948-014-2895-3
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DOI: https://doi.org/10.1007/s10948-014-2895-3