Phase transition, superstructure and physical properties of K2Fe4Se5 Y. J. Song, Z. Wang, Z.W. Wang, H. L. Shi, Z. Chen, H. F. Tian, G. F. Chen, H. X. Yang and J. Q. Li EPL, 95 3 (2011) 37007 Published online: 20 July 2011 DOI: 10.1209/0295-5075/95/37007