Calcium vapor synthesis of extremely coercive SmCo5. Issue 6 (28th January 2022)

• Record Type: Journal Article
• Authors: Baker, Sarah E.; Baker, Alexander A.; Orme, Christine A.; Worthington, Matthew A.; Li, Tian T.; Sedillo, Edwin M.; Dudoff, Jessica; Lee, Jonathan R. I.; Kuntz, Joshua D.; McCall, Scott K.
• Is Part Of: RSC advances. Volume 12:Issue 6(2022)
• Page Start: 3721
• Page End: 3728
• Publication Date: 2022-01-28
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d1ra07244g
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Greenbodies of SmCoO prior to conversion to SmCo5 and magnetometry showing excellent hard magnetic properties, resilient to >600 °C. Abstract : Exceptionally coercive SmCo5 particles are produced through calcium vapor reduction of SmCo5 O9 powders synthesized by flame spray pyrolysis. The resulting powders are composed of oblate hexagonal particles approximately 2 microns across with smooth surfaces. This microstructure yields record-breaking room temperature coercivity H c, i >80 kOe, or >60 kOe when combined with advanced manufacturing approaches such as electrophoretic deposition or molding with tetraglyme inks. These techniques enable straightforward low-loss fabrication of bulk parts. The high coercivity is extremely robust at elevated temperatures, exceeding 10 kOe even at 600 °C. The oxide precursor approach removes the need for strict environmental control during synthesis that is common to other nanoparticle-based routes and can readily be scaled to kilogram quantities of feedstock production. Magnet powders produced by calcium vapor reduction can thus function as the building blocks for traditional or advanced manufacturing techniques, while the high coercivity enables consistent performance across a wide range of temperatures.