The Influence of Co-Precipitation Technique on the Structure, Morphology and Dual-Modal Proton Relaxivity of GdFeO3 Nanoparticles

Nanocrystals of gadolinium orthoferrite (GdFeO3) with morphology close to isometric and superparamagnetic behavior were successfully synthesized using direct, reverse microreactor co-precipitation iron(III) hydroxides their subsequent heat treatment in the air. The obtained samples investigated by PXRD, FTIR, low-temperature nitrogen adsorption-desorption measurements, HRTEM, SAED, DRS vibration magnetometry. According X-ray diffraction patterns, GdFeO3 nanocrystals direct have smallest average size, while approximately same size. It was shown that characteristic particle size values are much larger than corresponding crystallite which indicates aggregation nanocrystals. aggregate more co-precipitation, which, turn, tend strongly co-precipitation. bandgap decreases decreasing is apparently due aggregation. colloidal solutions different concentrations 1H NMR measure T1 T2 relaxation times. Based on r2/r1 ratios, microreactor, may be classified as T1, T1–T2 dual-modal MRI contrast agents, respectively.