Synthesis and magnetic properties of La³⁺-Co²⁺ substituted strontium ferrite particles using modified spray pyrolysis-calcination method

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• 作者：Tae-Yeon Hwang^a ; Jimin Lee^a ; Hyo-Ryoung Lim^a ; Seung-Jae Jeong^a ; Guk-Hwan An^b ; Jongryoul Kim^c ; ^{jina@hanyang.ac.kr} ; Yong-Ho Choa^a ; ^{choa15@hanyang.ac.kr}
• 关键词：Powders ; solid state reaction ; Magnetic properties ; Transition metal oxide ; Hard magnets
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：43
• 期：4
• 页码：3879-3884
• 全文大小：925 K
• 卷排序：43

文摘

The purpose of the research was to improve the intrinsic magnetic properties of strontium ferrite by substituting lanthanum and cobalt for strontium and iron. The salt-assisted ultrasonic spray pyrolysis (SA-USP) following calcination process were used to from La-Co substituted strontium ferrite particles (LaxSr1-xFe12-yCoyO19), and their compositional dependent magnetic properties systemically investigated. All the samples were calcined at 1050 °C for 1 h in an air atmosphere to yield single-phased hexagonal particles several hundred nanometers to microns in size. A saturation magnetization of 70.76 emu/g and a coercivity 7265 Oe were obtained at a composition of La0.25Sr0.75Fe11.75Co0.25O19. The amount of Co was reduced to obtain an optimized saturation magnetization of 71.40 emu/g and a coercivity of 7572 Oe at a composition of La0.25Sr0.75Fe11.8Co0.2O19.