Structural and magnetic transitions in the Bi2Fe4O9/BiFeO3 composite

A Bi2Fe4O9/BiFeO3 composite with a percentage ratio of 67/33 has been synthesized, its morphological analysis has been carried out. The average crystallite sizes for each phase have been determined. The magnetization hysteresis has been established and the temperature of its disappearance has been found. Using the infrared absorption spectra, temperatures of the magnetic phase transitions in each phase have been determined from the magnetic susceptibility, magnetostriction constant, ultrasound damping coef-ficient, and phonon mode softening. The change of magnetostriction constant sign observed in the vicinity of the spin reorientation transition and antiferromagnetic transition in mullite has been attributed to the change of the sign of the magnetoelastic constants. The interaction between the phases in the composite and the correlation of its structural and magnetic properties have been established. (c) 2023 Elsevier B.V. All rights reserved.

Automated summary

A Bi2Fe4O9/BiFeO3 composite with a ratio of 67/33 has been synthesized and characterized. The average crystallite sizes for each phase were determined, and the magnetization hysteresis and disappearance temperature were established. The magnetic phase transitions of each phase were determined using infrared absorption spectra, and the correlation between the composite's structure and magnetic properties was studied.