Correlation of structural distortion with magnetic properties of Pr-YIG system

• The magnetic behavior of Pr-YIG is explained by a random cation distribution model.
• A specific superexchange interaction is associated to each iron ions configurations.
• The Mössbauer spectra are analyzed based on a random canting distribution.
• Hyperfine parameters revealed the magnetic contribution of different configurations.

The structural and magnetic measurements are carried out to interpret the effect of substitution of Pr3+ into Y3Fe5O15 system. The evolution of the microstructure and magnetic properties of Y3-xPrxFe5O12 (x = 0.0–0.8) series were characterized by the X-ray diffraction technique (XRD), Far-Fourier Transform Infrared Spectroscopy (Far-FTIR), Vibrating Sample Magnetometer (VSM) and Mössbauer spectroscopy. The Rietveld refinement of the X-ray data indicated that single-phase garnet structure was achieved for all the obtained samples. The observed absorption bands in Far-FTIR spectra shows the substitution structural effects. The effect of Pr3+ on magnetic properties have been analyzed based on associating a specific superexchange interaction to configurations of iron ions with fixed number of Pr3+ at their vicinity. A random cation distribution model is used to discussed the results in detail. The Mössbauer analyses are consistent with the explanation of the magnetization behavior and interestingly revealed that how different configurations with different superexchange interactions contribute in saturation magnetization variation.

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