Wenjie Wei, Shu Li, Zemeng Weng, Boya Zhang, Zhanmin Cao
{"title":"Phase Diagram Study of the Nd2O3-SiO2-FeO-Fe2O3 System at 1773 K in Air","authors":"Wenjie Wei, Shu Li, Zemeng Weng, Boya Zhang, Zhanmin Cao","doi":"10.1007/s11663-024-03189-w","DOIUrl":null,"url":null,"abstract":"<p>The phase diagram information of the Nd<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>-FeO-Fe<sub>2</sub>O<sub>3</sub> system is basic for the design and development of slag for recycling NdFeB magnets by pyrometallurgical processes. The equilibria phase relations of the Nd<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>-FeO-Fe<sub>2</sub>O<sub>3</sub> system were investigated at 1773 K in air using a high-temperature isothermal equilibration technique followed by quenching. Seven two-phase equilibria regions and seven three-phase equilibria regions were observed by X-ray diffraction (XRD) and scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS) analysis of quenched samples. Ternary compounds Nd<sub>9.33</sub>Si<sub>6−<i>x</i></sub>Fe<sub><i>x</i></sub>O<sub>26-δ</sub> and Nd<sub>0.67</sub>Si<sub>0.13</sub>Fe<sub>0.2</sub>O<sub>δ</sub> were found. The 1773 K isothermal section was constructed for the Nd<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>-FeO-Fe<sub>2</sub>O<sub>3</sub> system.</p>","PeriodicalId":18613,"journal":{"name":"Metallurgical and Materials Transactions B","volume":"63 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Metallurgical and Materials Transactions B","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1007/s11663-024-03189-w","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
The phase diagram information of the Nd2O3-SiO2-FeO-Fe2O3 system is basic for the design and development of slag for recycling NdFeB magnets by pyrometallurgical processes. The equilibria phase relations of the Nd2O3-SiO2-FeO-Fe2O3 system were investigated at 1773 K in air using a high-temperature isothermal equilibration technique followed by quenching. Seven two-phase equilibria regions and seven three-phase equilibria regions were observed by X-ray diffraction (XRD) and scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS) analysis of quenched samples. Ternary compounds Nd9.33Si6−xFexO26-δ and Nd0.67Si0.13Fe0.2Oδ were found. The 1773 K isothermal section was constructed for the Nd2O3-SiO2-FeO-Fe2O3 system.
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