Overview
Samarium powder is a finely divided form of the rare earth element samarium (Sm), primarily extracted from monazite and bastnäsite ores. As a lanthanide, it exhibits unique magnetic and nuclear properties, making it valuable in specialized industrial applications. The powder form is preferred for alloy production and chemical processes due to its high surface area and reactivity. Samarium is classified as a medium-hard metal with a bright silver luster when freshly prepared, though the powder typically appears grayish-black due to surface oxidation. Its global production is limited, with China dominating the supply chain. Industrial buyers should verify traceability and compliance with international rare earth trade regulations.
Physical and Chemical Properties
Samarium powder has a hexagonal crystal structure at room temperature, transitioning to body-centered cubic above 731°C. Its notable 4f electron configuration contributes to strong paramagnetism, with a magnetic susceptibility of +1,860×10−6 cm³/mol. The powder gradually oxidizes in air, forming samarium(III) oxide (Sm2O3), and reacts exothermically with water at elevated temperatures. Thermally, samarium has a low vapor pressure below 1000°C, making it suitable for vacuum applications. The powder's typical particle sizes range from 1-100 microns, with specific surface areas varying between 0.5-5 m²/g depending on production methods (e.g., reduction-distillation or metallothermic processes). Purity grades from 99% to 99.99% are commercially available, with oxygen content being the primary impurity.
Main Applications
The largest application (70% of consumption) is in samarium-cobalt (SmCo) magnets, which maintain magnetic properties at temperatures up to 350°C. These permanent magnets are critical in aerospace, military, and high-performance motor systems. In nuclear technology, samarium powder serves as a neutron absorber in control rods due to its high thermal neutron capture cross-section (5,800 barns). Electronics manufacturers use samarium in thin-film coatings for optical glass and as a dopant in calcium fluoride crystals for lasers. Emerging applications include catalysts for ethanol dehydration and organic synthesis processes. Recent research explores its use in quantum computing materials and next-generation battery technologies.
Safety and Storage
Samarium powder presents moderate health hazards (H228-H261) as a flammable solid that reacts with water to release hydrogen gas. Proper handling requires ANSI-approved dust masks, chemical goggles, and flame-resistant lab coats. Storage must be in hermetically sealed containers under argon or nitrogen atmosphere, with humidity below 10% RH. Spills should be contained using dry sand or vermiculite—never water. Firefighting requires Class D extinguishers for metal fires. The powder is not considered highly toxic, but chronic exposure may cause lung fibrosis. Facilities should implement explosion-proof electrical systems and grounding procedures to prevent electrostatic discharge ignition.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with ISO 9001 certification for rare earth metals. Key specifications include: purity (99.5% min for most applications), particle size distribution (D50 value), oxygen content (<1% for magnetic applications), and tap density (2-4 g/cm³ for pressing operations). Bulk shipments (25kg drums) typically offer 15-20% cost savings compared to 1kg laboratory quantities. Consider FOB China prices for large orders, but factor in 8-12% import duties for Western markets. Technical datasheets should include ICP-MS analysis and SEM images. For magnetic applications, request saturation magnetization (≥70 emu/g) and coercivity test reports. Just-in-time delivery is recommended due to material oxidation risks.
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