• Magnetic and microwave-absorbing properties of SrAl4Fe8O19 powders synthesized by coprecipitation and citriccombustion methods

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    • Keywords

       

      SrAl4Fe8O19; coprecipitation method; shape anisotropy; magnetic property; microwave absorption.

    • Abstract

       

      Al-substituted 𝑀-type hexaferrite is a highly anisotropic ferromagnetic material. In the present study, the coprecipitation and the citric-combustion methods of synthesis for SrAl4Fe8O19 powders were explored and their microstructure, magnetic properties, and microwave absorptivity examined. X-ray diffraction (XRD), scanning electron microscopy (SEM), a vibrating sample magnetometer, and a vector network analyser were used to characterize the powders. The XRD analyses indicated that the pure SrAl4Fe8O19 powder was synthesized at 900°C and 1000°C for 3 h by coprecipitation, but only at 1000°C for the citric-combustion processes. The SEM analysis revealed that the coprecipitation process yielded a powder with a smaller particle size, near single-domain structure, uniform grain morphology, and smaller shape anisotropy than the citric-combustion process. The synthesis technique also significantly affected the magnetic properties and microwave-absorptivity. Conversely, calcining temperature and calcining time had less of an effect. The grain size was found to be a key factor affecting the property of the powder. The powders synthesized by coprecipitation method at calcining temperature of 900°C exhibited the largest magnetization, largest coercivity, and best microwave absorptivity.

    • Author Affiliations

       

      H Y He1 J F Huang1 L Y Cao1 Z He1 Q Shen1

      1. Key Laboratory of Auxiliary Chemistry & Technology for Chemical Industry, Ministry of Education, Shaanxi University of Science and Technology, Xi’an, Shaanxi 710021, China
    • Dates

       
  • Bulletin of Materials Science | News

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