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Highlights Crystallites sizes of nanoparticles synthesized via ultrasound irradiation were less than 40nm. Ms and Hc of nanoparticles obtained at 25℃ were higher than at 50℃ under the same power. The samples exhibited the highest Ms at 25℃ and the lowest Hc at 50℃ both for 60W. The ultrasonic irradiation had a positive effect on improving the ferrite magnetic properties.

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