Electron energy loss spectroscopy of K0.7Fe1.7Se2 superconductor Ming He, Yongzheng Zhu, Ke Ma and Zhi-Hua Zhang Eur. Phys. J. Appl. Phys., 98 (2023) 13 Published online: 22 February 2023 DOI: 10.1051/epjap/2023220245