Controllable synthesis of ScFeO3 ceramics with microstructural evolution for thin and broadband high-performance microwave absorption

• Published in: Journal of alloys and compounds Vol. 925; p. 166826
• Main Authors: Wei, Hanjun, Yu, Yaping, Feng, Pei, Xue, Jimei, Pan, Jinyuan, Zhao, Feng, Wang, Qingyuan
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 05.12.2022; Elsevier BV
• Subjects: Broadband; Ceramics; Controllability; Impedance matching; Material properties; Microstructure; Microwave absorption; Microwave absorption properties; Reflectance; ScFeO3 ceramics; Sintering; Sintering temperature; Thickness; Microwave absorption properties; ScFeO3 ceramics; Sintering temperature; Microstructure
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2022.166826

Controlled microstructures play a pivotal role in upgrading the microwave absorption properties of materials. Herein, ScFeO3 ceramics with a controllable three-dimensional (3D) network structure were prepared by adjusting the sintering temperature. Specifically, the effect of sintering temperature on microstructure and microwave absorption properties were investigated. The results show that ScFeO3 ceramics with the sintering temperature of 1300 ºC possess the superior dielectric and magnetic loss capabilities for incident microwaves, which attributes to the ideal 3D network microstructure enhancing the impedance matching characteristic. Besides, this unique 3D network microstructure not only provides multiple channels for multiple reflecting and scattering of microwaves, but also offers abundant interfaces to dissipate microwaves. Furthermore, the natural resonance effect efficiently increases the magnetic loss. The optimal ScFeO3 samples possess the minimum reflection coefficient (RCmin) of − 57.4 dB at 17.44 GHz with a thickness of 2.45 mm and an effective absorption bandwidth (EAB) covering the whole Ku band (5.6 GHz) with a thickness range of 1.35–1.55 mm. It is believed that ScFeO3 ceramics can be new promising microwave absorption material with thin, broadband, and strong absorption performance. •The ScFeO3 ceramics with three-dimensional (3D) network microstructures are prepared by sol-gel and calcination technology.•The 3D network microstructures exhibit good synergism of impedance matching characteristics and multiple dissipation mechanisms.•The ScFeO3 ceramics display excellent microwave absorption performances.