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Nanoparticles (dia. approximately 5-7 nm) of Bi0.5X0.5(X = Ca, Sr)MnO3 are prepared by polymer assisted sol-gel method and characterized by various physico-chemical techniques. X-ray diffraction gives evidence for single phasic nature of the materials as well as their structures. Mono-dispersed to a large extent, isolated nanoparticles are seen in the transmission electron micrographs. High resolution electron microscopy shows the crystalline nature of the nanoparticles. Superconducting quantum interferometer based magnetic measurements from 10 K to 300 K show that these nanomanganites retain the charge ordering nature unlike Pr and Nd based nanomanganites. The CO in Bi based manganites is thus found to be very robust consistent with the observation that magnetic fields of the order of 130 T are necessary to melt the CO in these compounds. These results are supported by electron magnetic resonance measurements.

Preparation, Characterization, and Magnetic Studies of Bi0.5X0.5(X = Ca, Sr)MnO3 Nanoparticles

Preparation, Characterization, and Magnetic Studies of Bi_0.5X_0.5(X = Ca, Sr)MnO₃ Nanoparticles