Nano-crystalline Pure and Erbium(Er) substituted Bismuth ferrite nano-particles were synthesized by the citrate-gel auto combustion method. Synthesized powders were sintered at 500 0 C for ve hours in an air and characterized by XRD, TEM and HR-TEM. X-ray diffraction (XRD) analysis showed distorted rhombohedral structure of the ferrites. The surface morphology and particle size of the samples was observed by high resolution transmission electron microscopy. The lattice parameter, crystalline size, Xray density has been calculated from d-spacing. The perceived results can be explained depending on doping concentration. Temperature dependence of magnetic properties of Bi-Er nano-particles were carried out by using vibrating sample magnetometer (VSM). The magnetization as a function of applied eld at ± 100 Oe was carried out at 3K and 300K. Zero eld cooled and (ZFC) and Field cooled (FC) magnetization measurements under an applied of 100 Oe in the temperature range of 3-360K. These measurements give the results of blocking temperature (T b ) at around 350K.

Nano-crystalline Pure and Erbium(Er) substituted Bismuth ferrite nano-particles were synthesized by the citrate-gel auto combustion method. Synthesized powders were sintered at 5000C for five hours in an air and characterized by XRD, TEM and HR-TEM. X-ray diffraction (XRD) analysis showed distorted rhombohedral structure of the ferrites. The surface morphology and particle size of the samples was observed by high resolution transmission electron microscopy. The lattice parameter, crystalline size, X-ray density has been calculated from d-spacing. The perceived results can be explained depending on doping concentration. Temperature dependence of magnetic properties of Bi-Er nano-particles were carried out by using vibrating sample magnetometer (VSM). The magnetization as a function of applied field at ± 100 Oe was carried out at 3K and 300K. Zero field cooled and (ZFC) and Field cooled (FC) magnetization measurements under an applied of 100 Oe in the temperature range of 3-360K. These measurements give the results of blocking temperature (Tb) at around 350K.