Effect of sintering time on electronic properties of strontium hexaferrite. Issue 9 (1st May 2022)

• Record Type: Journal Article
• Authors: Kang, Kungwan; Byun, Jinho; Jeen, Mijung; Jo, Giryeon; Baek, Youn-Kyoung; Lee, Jaekwang; Jeen, Hyoungjeen
• Is Part Of: Ceramics international. Volume 48:Issue 9(2022)
• Page Start: 12476
• Page End: 12482
• Publication Date: 2022-05-01
• Subjects: M-type hexaferrite -- Permanent magnet -- Impedance spectroscopy -- Magnetism -- Relaxation process; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.01.113
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Polycrystalline M-type strontium hexaferrite was synthesized by a solid-state reaction, and the change in physical properties according to the change of sintering conditions was studied. Rietveld refinement analyses on the strontium hexaferrite sintered in different conditions indicate negligible change in the crystal structure, and the results from FE-EPMA indicate little change in stoichiometry. However, the results from FE-SEM measurements show grain growth in the ones sintered for longer time. In addition, this grain growth affects the decrease in the coercive field. In addition, results of impedance measurements show drastic difference in relaxation behavior. Double relaxation peaks appear in frequency domain in all samples. Double relaxation peaks appear due to grain and grain boundary effects, and two factors were confirmed through Z-view data fitting. As the grain size increases by longer sintering, the relaxation frequency shifts to the high frequency region, and overall normalized resistance decreases. From this result, only electrical properties were controlled without magnetic change through sintering condition control.