{"title":"Mn-Al-Cr取代m型六铁体硬磁性能的增强","authors":"Il-Ho Yoon, Young-Min Kang","doi":"10.1007/s13391-025-00586-4","DOIUrl":null,"url":null,"abstract":"<div><p>This study investigates the magnetic properties of isotropic sintered magnets based on M-type hexaferrite SrFe<sub>12</sub>O<sub>19</sub>, enhanced through multi-cation substitution with Al, Cr, and Mn. M-type hexaferrite samples with the general formula SrFe<sub>12 − 2<i>x</i></sub>Al<sub><i>x</i></sub>Cr<sub><i>x</i></sub>O<sub>19</sub> (<i>x</i> = 0–0.3) were synthesized via a solid-state reaction method to investigate the effects of Al–Cr substitution on the structural and magnetic properties. X-ray diffraction (XRD) analysis confirmed the formation of a single-phase M-type hexaferrite with minor traces of Fe<sub>2</sub>O<sub>3</sub> in some samples. Magnetic characterization showed that coercivity (H<sub>C</sub>) increased while remanent magnetization (4πM<sub>r</sub>) decreased with increasing <i>x</i>, exhibiting a typical trade-off behavior. Among the compositions, <i>x</i> = 0.2 exhibited the most balanced magnetic properties. Based on this, further substitutions with Mn, Co, La, and Ce were introduced, and Mn substitution slightly enhanced H<sub>C</sub>. Optimization of sintering additives and temperature revealed that the composition SrFe<sub>11.5</sub>Mn<sub>0.1</sub>Al<sub>0.2</sub>Cr<sub>0.2</sub>O<sub>19</sub>, sintered with 1 wt% CaCO₃ + 1 wt% SiO₂ at 1230 °C, exhibited the best performance with 4πM<sub>r</sub> = 2207 G and H<sub>C</sub> = 5304 Oe. The results demonstrate that simultaneous multi-cation substitution and sintering condition control can significantly enhance the hard-magnetic properties of M-type hexaferrites.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":536,"journal":{"name":"Electronic Materials Letters","volume":"21 5","pages":"697 - 706"},"PeriodicalIF":2.6000,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Enhancement of Hard-magnetic Properties in Mn-Al-Cr Substituted M-type Hexaferrite\",\"authors\":\"Il-Ho Yoon, Young-Min Kang\",\"doi\":\"10.1007/s13391-025-00586-4\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>This study investigates the magnetic properties of isotropic sintered magnets based on M-type hexaferrite SrFe<sub>12</sub>O<sub>19</sub>, enhanced through multi-cation substitution with Al, Cr, and Mn. M-type hexaferrite samples with the general formula SrFe<sub>12 − 2<i>x</i></sub>Al<sub><i>x</i></sub>Cr<sub><i>x</i></sub>O<sub>19</sub> (<i>x</i> = 0–0.3) were synthesized via a solid-state reaction method to investigate the effects of Al–Cr substitution on the structural and magnetic properties. X-ray diffraction (XRD) analysis confirmed the formation of a single-phase M-type hexaferrite with minor traces of Fe<sub>2</sub>O<sub>3</sub> in some samples. Magnetic characterization showed that coercivity (H<sub>C</sub>) increased while remanent magnetization (4πM<sub>r</sub>) decreased with increasing <i>x</i>, exhibiting a typical trade-off behavior. Among the compositions, <i>x</i> = 0.2 exhibited the most balanced magnetic properties. Based on this, further substitutions with Mn, Co, La, and Ce were introduced, and Mn substitution slightly enhanced H<sub>C</sub>. Optimization of sintering additives and temperature revealed that the composition SrFe<sub>11.5</sub>Mn<sub>0.1</sub>Al<sub>0.2</sub>Cr<sub>0.2</sub>O<sub>19</sub>, sintered with 1 wt% CaCO₃ + 1 wt% SiO₂ at 1230 °C, exhibited the best performance with 4πM<sub>r</sub> = 2207 G and H<sub>C</sub> = 5304 Oe. The results demonstrate that simultaneous multi-cation substitution and sintering condition control can significantly enhance the hard-magnetic properties of M-type hexaferrites.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>\",\"PeriodicalId\":536,\"journal\":{\"name\":\"Electronic Materials Letters\",\"volume\":\"21 5\",\"pages\":\"697 - 706\"},\"PeriodicalIF\":2.6000,\"publicationDate\":\"2025-08-08\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Electronic Materials Letters\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s13391-025-00586-4\",\"RegionNum\":4,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Electronic Materials Letters","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s13391-025-00586-4","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Enhancement of Hard-magnetic Properties in Mn-Al-Cr Substituted M-type Hexaferrite
This study investigates the magnetic properties of isotropic sintered magnets based on M-type hexaferrite SrFe12O19, enhanced through multi-cation substitution with Al, Cr, and Mn. M-type hexaferrite samples with the general formula SrFe12 − 2xAlxCrxO19 (x = 0–0.3) were synthesized via a solid-state reaction method to investigate the effects of Al–Cr substitution on the structural and magnetic properties. X-ray diffraction (XRD) analysis confirmed the formation of a single-phase M-type hexaferrite with minor traces of Fe2O3 in some samples. Magnetic characterization showed that coercivity (HC) increased while remanent magnetization (4πMr) decreased with increasing x, exhibiting a typical trade-off behavior. Among the compositions, x = 0.2 exhibited the most balanced magnetic properties. Based on this, further substitutions with Mn, Co, La, and Ce were introduced, and Mn substitution slightly enhanced HC. Optimization of sintering additives and temperature revealed that the composition SrFe11.5Mn0.1Al0.2Cr0.2O19, sintered with 1 wt% CaCO₃ + 1 wt% SiO₂ at 1230 °C, exhibited the best performance with 4πMr = 2207 G and HC = 5304 Oe. The results demonstrate that simultaneous multi-cation substitution and sintering condition control can significantly enhance the hard-magnetic properties of M-type hexaferrites.
期刊介绍：
Electronic Materials Letters is an official journal of the Korean Institute of Metals and Materials. It is a peer-reviewed international journal publishing print and online version. It covers all disciplines of research and technology in electronic materials. Emphasis is placed on science, engineering and applications of advanced materials, including electronic, magnetic, optical, organic, electrochemical, mechanical, and nanoscale materials. The aspects of synthesis and processing include thin films, nanostructures, self assembly, and bulk, all related to thermodynamics, kinetics and/or modeling.
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