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Title: Magnetic Field Directed Rare‐Earth Separations

Journal Article · · Angewandte Chemie
ORCiD logo [1]; ORCiD logo [2];  [1];  [1];  [1]; ORCiD logo [1]
  1. P. Roy and Diana T. Vagelos Laboratories Department of Chemistry University of Pennsylvania 231 S. 34th St. Philadelphia PA 19104 USA
  2. P. Roy and Diana T. Vagelos Laboratories Department of Chemistry University of Pennsylvania 231 S. 34th St. Philadelphia PA 19104 USA, Eramet Ideas 1 rue Albert Einstein 78190 Trappes France

Abstract The separation of rare‐earth ions from one another is challenging due to their chemical and physical similarities. Nearly all rare‐earth separations rely upon small changes in ionic radii to direct speciation or reactivity. Herein, we show that the intrinsic magnetic properties of the rare‐earth ions impact the separations of light/heavy and selected heavy/heavy binary mixtures. Using TriNOx 3− ([{(2‐ t BuNO)C 6 H 4 CH 2 } 3 N] 3− ) rare‐earth complexes, we efficiently and selectively crystallized heavy rare earths (Tb–Yb) from a mixture with light rare earths (La and Nd) in the presence of an external Fe 14 Nd 2 B magnet, concomitant with the introduction of a concentration gradient (decrease in temperature). The optimal separation was observed for an equimolar mixture of La:Dy, which gave an enrichment factor of EF La:Dy =297±31 for the solid fraction, compared to EF La:Dy =159±22 in the absence of the field, and achieving a 99.7 % pure Dy sample in one step. These results indicate that the application of a magnetic field can improve performance in a molecular separation system for paramagnetic rare‐earth cations.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NONE; SC0017259
OSTI ID:
1579368
Journal Information:
Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 5 Vol. 132; ISSN 0044-8249
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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