Dielectric and Structure Properties of Charge Competing System YFe 2 O 4

Abstract

YFe 2 O 4 m i ( i < 0.005), which is a member of charge-frustrated system RFe 2 O 4 was synthesized and investigated by the low-temperature synchrotron powder X-ray diffraction. The structure between 225K and 250K is the same with the three-dimensional charge ordered state of LuFe 2 O 4 . Below the charge ordering temperature, at least five different phase transitions were detected. Since the balance of competing interaction between ionic charge essentially dominates the presence of multi phases in frustrated system, the low oxygen deficiency in YFe 2 O 4 m i is considered as the origin of the multi phases in low temperature.