Abstract
Phase assemblages of the K–Fe–Se ternary system (x K < 33.3 %) were obtained by powder X-ray diffraction (PXRD). The superconducting phase KxFe2-ySe2 has not been detected in the phase assemblages. Based on the microscopic image and magnetic susceptibility of the samples with different annealing times, we demonstrate that KxFe2-ySe2 is the metastable phase, which only appeared at the beginning of annealing process, and converted to the non-superconducting phase after the long-time annealing.
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The financial support by the National Natural Science Foundation of China (Nos. 51172025, 51472029 and 51402014) and China Postdoctoral Science Foundation (No. 2013M540860) is gratefully acknowledged.
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Guo, Z., Li, S., Zhang, L. et al. Phase assemblages of the K–Fe–Se ternary system (x K < 33.3 %) and the metastability of superconducting phase in this area. Monatsh Chem 146, 1807–1813 (2015). https://doi.org/10.1007/s00706-015-1489-5
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DOI: https://doi.org/10.1007/s00706-015-1489-5