Hongyang Dai , Jiayi Huang , Shulan Zuo, Mingyao Hu, Lei Yang, Jinghua Liu, Chengbao Jiang
{"title":"Enhanced compensation effect of Gd and Dy in 2:17-type SmCo magnets","authors":"Hongyang Dai , Jiayi Huang , Shulan Zuo, Mingyao Hu, Lei Yang, Jinghua Liu, Chengbao Jiang","doi":"10.1016/j.scriptamat.2024.116406","DOIUrl":null,"url":null,"abstract":"<div><div>The maximum magnetic energy product ((<em>BH</em>)<sub>max</sub>) of 2:17-type SmCo magnets with low temperature coefficient (<em>α</em>), prepared by partially substituting Sm with heavy rare-earth elements (HREs), are lower than that of conventional magnets. Optimizing their magnetic properties by harnessing complementary advantages of different HREs is an effective approach that warrants further study. This study unveils an enhanced compensation effect of co-doping Gd and Dy elements in SmCo magnets, which becomes significant as the total content of Gd and Dy increases. Specifically, when the co-doping level of Gd and Dy reaches 10.3 wt%, there is a significant improvement of 71 % in (<em>BH</em>)<sub>max</sub> compared to doping with 10.3 wt% Dy alone, while maintaining a comparable <em>α</em> value. Microstructure and microchemistry analysis, along with first principles calculations reveal that this effect is closely associated with the enrichment of Dy in cell 2:17R phases. This finding holds significance for designing temperature-stable SmCo magnets.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"255 ","pages":""},"PeriodicalIF":5.3000,"publicationDate":"2024-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Scripta Materialia","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S135964622400441X","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The maximum magnetic energy product ((BH)max) of 2:17-type SmCo magnets with low temperature coefficient (α), prepared by partially substituting Sm with heavy rare-earth elements (HREs), are lower than that of conventional magnets. Optimizing their magnetic properties by harnessing complementary advantages of different HREs is an effective approach that warrants further study. This study unveils an enhanced compensation effect of co-doping Gd and Dy elements in SmCo magnets, which becomes significant as the total content of Gd and Dy increases. Specifically, when the co-doping level of Gd and Dy reaches 10.3 wt%, there is a significant improvement of 71 % in (BH)max compared to doping with 10.3 wt% Dy alone, while maintaining a comparable α value. Microstructure and microchemistry analysis, along with first principles calculations reveal that this effect is closely associated with the enrichment of Dy in cell 2:17R phases. This finding holds significance for designing temperature-stable SmCo magnets.
期刊介绍:
Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.