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Title: Chemical Synthesis of Magnetically Hard and Strong Rare Earth Metal Based Nanomagnets

Abstract

We report here a general chemical approach to synthesize strongly ferromagnetic rare-earth metal (REM) based SmCo and SmFeN nanoparticles (NPs) with ultra-large coercivity. The synthesis started with the preparation of hexagonal CoO+Sm2O3 (denoted as SmCo-O) multipods via decomposition of Sm(acac)3 and Co(acac)3 in oleylamine. These multipods were further reduced with Ca at 850 °C to form SmCo5 NPs with sizes tunable from 50 to 200 nm. The 200 nm SmCo5 NPs were dispersed in ethanol, and magnetically aligned in polyethylene glycol (PEG) matrix, yielding a PEG-SmCo5 NP composite with the room temperature coercivity (Hc) of 49.2 kOe, the largest Hc among all ferromagnetic NPs ever reported, and saturated magnetic moment (Ms) of 88.7 emu g-1, the highest value reported for SmCo5 NPs. The method was extended to synthesize other ferromagnetic NPs of Sm2Co17, and, for the first time, of Sm2Fe17N3 NPs with Hc over 15 kOe and Ms reaching 127.9 emu g-1. These REM based NPs are important magnetic building blocks for fabrication of high-performance permanent magnets, flexible magnets, and printable magnetic inks for energy and sensing applications.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2];  [2]; ORCiD logo [3]; ORCiD logo [4];  [1]; ORCiD logo [5]; ORCiD logo [1]; ORCiD logo [1]
  1. Brown Univ., Providence, RI (United States). Dept. of Chemistry
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Materials Science Division
  3. Harbin Inst. of Technology (China). School of Chemical Engineering and Technology
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials
  5. Brown Univ., Providence, RI (United States). Dept. of Chemistry; Harbin Inst. of Technology (China). School of Chemical Engineering and Technology
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Brown Univ., Providence, RI (United States); Harbin Inst. of Technology (China)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office; USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NNSFC)
OSTI Identifier:
1498861
Alternate Identifier(s):
OSTI ID: 1484816; OSTI ID: 1513158
Report Number(s):
BNL-211351-2019-JAAM; LLNL-JRNL-768237
Journal ID: ISSN 1433-7851
Grant/Contract Number:  
SC0012704; AC52-07NA27344; 51571072
Resource Type:
Accepted Manuscript
Journal Name:
Angewandte Chemie (International Edition)
Additional Journal Information:
Journal Name: Angewandte Chemie (International Edition); Journal Volume: 58; Journal Issue: 2; Journal ID: ISSN 1433-7851
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; intermetallic phases; magnetic properties; nanoparticles; rare earths; reduction

Citation Formats

Shen, Bo, Yu, Chao, Baker, Alexander A., McCall, Scott K., Yu, Yongsheng, Su, Dong, Yin, Zhouyang, Liu, Hu, Li, Junrui, and Sun, Shouheng. Chemical Synthesis of Magnetically Hard and Strong Rare Earth Metal Based Nanomagnets. United States: N. p., 2018. Web. doi:10.1002/anie.201812007.
Shen, Bo, Yu, Chao, Baker, Alexander A., McCall, Scott K., Yu, Yongsheng, Su, Dong, Yin, Zhouyang, Liu, Hu, Li, Junrui, & Sun, Shouheng. Chemical Synthesis of Magnetically Hard and Strong Rare Earth Metal Based Nanomagnets. United States. doi:10.1002/anie.201812007.
Shen, Bo, Yu, Chao, Baker, Alexander A., McCall, Scott K., Yu, Yongsheng, Su, Dong, Yin, Zhouyang, Liu, Hu, Li, Junrui, and Sun, Shouheng. Fri . "Chemical Synthesis of Magnetically Hard and Strong Rare Earth Metal Based Nanomagnets". United States. doi:10.1002/anie.201812007. https://www.osti.gov/servlets/purl/1498861.
@article{osti_1498861,
title = {Chemical Synthesis of Magnetically Hard and Strong Rare Earth Metal Based Nanomagnets},
author = {Shen, Bo and Yu, Chao and Baker, Alexander A. and McCall, Scott K. and Yu, Yongsheng and Su, Dong and Yin, Zhouyang and Liu, Hu and Li, Junrui and Sun, Shouheng},
abstractNote = {We report here a general chemical approach to synthesize strongly ferromagnetic rare-earth metal (REM) based SmCo and SmFeN nanoparticles (NPs) with ultra-large coercivity. The synthesis started with the preparation of hexagonal CoO+Sm2O3 (denoted as SmCo-O) multipods via decomposition of Sm(acac)3 and Co(acac)3 in oleylamine. These multipods were further reduced with Ca at 850 °C to form SmCo5 NPs with sizes tunable from 50 to 200 nm. The 200 nm SmCo5 NPs were dispersed in ethanol, and magnetically aligned in polyethylene glycol (PEG) matrix, yielding a PEG-SmCo5 NP composite with the room temperature coercivity (Hc) of 49.2 kOe, the largest Hc among all ferromagnetic NPs ever reported, and saturated magnetic moment (Ms) of 88.7 emu g-1, the highest value reported for SmCo5 NPs. The method was extended to synthesize other ferromagnetic NPs of Sm2Co17, and, for the first time, of Sm2Fe17N3 NPs with Hc over 15 kOe and Ms reaching 127.9 emu g-1. These REM based NPs are important magnetic building blocks for fabrication of high-performance permanent magnets, flexible magnets, and printable magnetic inks for energy and sensing applications.},
doi = {10.1002/anie.201812007},
journal = {Angewandte Chemie (International Edition)},
number = 2,
volume = 58,
place = {United States},
year = {2018},
month = {11}
}

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