Multi-ferroelectricity in charge ordered LuFe2O4(LuFeO3)n with n=1
  Electronic ferroelectricity from charge ordering (CO) is currently a significant issue that has been extensively investigated in the charge/spin frustrated LuFe2O4 system. Chemical substitution and structural layer intercalation have been considered as potentially effective approaches in our recent study, and we herein report on the structural and multi-ferromagnetic properties in the layered series of LuFe2O4(LuFeO3)n (n=0, 1, and 2). Experimental investigations reveal that the (RFeO3)-layer intercalation results in notable changes in ferroelectricity, magnetic properties and CO features. These results demonstrate that further exploration of this series of layered members might prove fruitful. 
H. X. Yang, Y. Zhang, C. Ma, H. F. Tian, Y. B. Qin, Y. G. Zhao, J. Q.   Li