Sintering and cooling atmosphere effects on the microstructure, magnetic properties and DC superposition behavior of NiCuZn ferrites. Issue 5 (May 2017)

• Record Type: Journal Article
• Authors: Hsiang, Hsing-I; Kuo, Wen-Ching; Hsi, Chi-Shiung
• Is Part Of: Journal of the European Ceramic Society. Volume 37:Issue 5(2017)
• Page Start: 2123
• Page End: 2128
• Publication Date: 2017-05
• Subjects: NiCuZn ferrites -- CuO segregation -- DC-bias-superposition; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2017.01.025
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: This study investigated the sintering and cooling atmosphere effects on the microstructure and magnetic properties of NiCuZn ferrites. The copper-rich phase segregated during sintering near the grain boundaries. The sample sintered in N2 and cooled in air (N2 -Air) exhibited the highest amount of segregated copper-rich second phase, followed by the sample sintered and cooled both in air (Air-Air). However, no precipitate was observed for the sample sintered and cooled both in N2 (N2 -N2 ). This can be explained by the fact that Cu 2+ was reduced into Cu +, promoting Cu2 O phase precipitation and then reacting with CuO to form a liquid phase. The Air-Air sample exhibited the highest initial permeability (μi ≈ 250) and saturation magnetization (Bs ≈ 88 emu/g), followed by N2 -N2 (μi ≈ 180, Bs ≈ 82) and N2 -Air (μi ≈ 150, Bs ≈ 80). The highest DC superposition behavior was obtained for N2 -Air sample due to the highest nonmagnetic copper-rich precipitate thickness at the grain boundaries.