Microstructural properties of K0.8 Fe1.6 S2, K0.8 Fe1.75 Se2-y Sy(0 ≤ y ≤ 2) and K0.8 Fe1.5+x S2(0 < x ≤ 0.5) single crystalsY. Cai, Z. Wang, Z. W. Wang, Z. A. Sun, H. X. Yang, H. F. Tian, C. Ma, B. Zhang and J. Q. LiEPL, 103 3 (2013) 37010DOI: https://doi.org/10.1209/0295-5075/103/37010