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Samarium Oxide (Sm₂O₃) is a pale yellow powder celebrated for its exceptional magnetic properties and role in optoelectronic devices. With a CAS number of 12060-58-1 and a molecular weight of 348.72 g/mol, this rare-earth oxide offers purity levels of 99.9%-99.99% (4N), featuring a melting point of 2262°C and a density of 7.40 g/cm³. Its strong ferromagnetic behavior at low temperatures and efficient light absorption in the visible spectrum make it a cornerstone material in permanent magnets, laser crystals, and optical filters.
1. High Magnetic Moment: Sm³+ ions exhibit a large magnetic moment (0.8 μB), critical for producing samarium-cobalt (SmCo) permanent magnets with coercivity up to 30 kOe, ideal for high-temperature environments.
2. Optical Absorption: Strong absorption bands in the 400-700 nm range enable use as a spectral filter in analytical instruments, blocking specific wavelengths to improve measurement accuracy.
3. Thermal Stability: Maintains structural integrity in oxidizing atmospheres up to 1800°C, suitable for thermal barrier coatings in gas turbine components.
4. Controllable Particle Size: Available in nanoscale (50-100 nm) and micron-scale (1-5 μm) distributions to optimize packing density in magnet powders and ceramic composites.
5. Low Rare-Earth Impurities: Strict control of adjacent lanthanides (Eu, Gd, Nd < 0.05%) ensures consistent magnetic and optical performance across batches.
• Permanent Magnets: A key component in SmCo5 and Sm2Co17 magnets, used in aerospace actuators, wind turbine generators, and military-grade navigation systems, where high temperature resistance (up to 500°C) and corrosion stability are essential.
• Laser Technology: Doped into yttrium-aluminum garnet (YAG) crystals to create Sm:YAG lasers, emitting at 1.06 μm for rangefinders and material processing, leveraging its low quantum defect for efficient energy conversion.
• Optical Glass: Improves refractive index and Abbe number in precision lenses for microscopes and telescopes, reducing chromatic aberration and enhancing image clarity.
• Catalysis: Supports for automotive exhaust catalysts, promoting NOx reduction by enhancing the redox activity of precious metal nanoparticles (Pt, Pd) through strong metal-oxide interactions.
• Thermoelectric Materials: Mixed with tellurium and selenium to form Sm-doped thermoelectric alloys, converting waste heat to electricity with improved figure of merit (ZT) in industrial waste recovery systems.
Q: What is the main advantage of SmCo magnets over NdFeB magnets?
A: SmCo magnets offer superior temperature stability (retaining 90% of flux at 300°C) and corrosion resistance, making them ideal for harsh environments where NdFeB magnets might degrade.
Q: Can Samarium Oxide be used in upconversion materials?
A: Yes, when combined with Yb³+ and Er³+ ions, it enables near-infrared to visible upconversion for anti-counterfeiting inks and biomedical imaging probes.
Q: How is particle size controlled during synthesis?
A: We use sol-gel and spray-drying techniques to engineer particle morphology, with nanoscale products suitable for thin-film deposition and micron-scale for magnet powder metallurgy.
Q: What is the shelf life under standard storage conditions?
A: Sealed in dry nitrogen-filled containers, Sm₂O₃ remains stable for 5+ years at <25°C and <40% RH; avoid prolonged exposure to humid air to prevent surface hydroxylation.
Q: Are there any radioactive concerns with Samarium Oxide?
A: No, natural samarium contains non-radioactive isotopes (⁵⁸Sm, ⁶⁰Sm), and the material is classified as non-hazardous for industrial handling.
Material name | Samarium Oxide |
Formula | Sm2O3 |
CAS No. | 12060-58-1 |
EINECS NO. | 235-043-6 |
Molecular Weight | 348.80 |
Density | 8.34 g/cm3 |
Melting point | 2325°C |
Appearance | Pale yellow powder |
Purity/Specification (Sm2O3/REO) | 99%-99.999% |
Solubility | Insoluble in water, soluble in inorganic acids |
| Samarium Oxide Sm2O3 | ||||||
| Purity | 2N | 2N5 | 3N | 3N5 | 4N | |
| TREO%min. | 99 | 99 | 99 | 99 | 99 | |
| Sm²O3/TREO%min. | 99 | 99.5 | 99.9 | 99.95 | 99.99 | |
| Rare earth impurities %max. | Pr6O11 | subtotal 1 | subtotal 0.5 | subtotal 0.1 | Eu203 max. 0.0050, other REO subtota max:0.050 | 0.001 |
| Nd₂O3 | 0.0035 | |||||
| Eu₂O3 | 0.001 | |||||
| Gd₂O3 | 0.001 | |||||
| Y₂O3 | 0.001 | |||||
| other REO | subtotal 0.0025 | |||||
| Non rare earth impurities %max. | Fe₂O3 | 0.003 | 0.01 | 0.001 | 0.0005 | 0.0003 |
| SiO₂ | 0.03 | 0.01 | 0.005 | 0.005 | 0.003 | |
| Cao | 0.05 | 0.03 | 0.01 | 0.008 | 0.005 | |
| Al₂O3 | 0.04 | 0.03 | 0.02 | 0.02 | 0.01 | |
| CI | 0.03 | 0.02 | 0.01 | 0.01 | 0.01 | |
| L.O.I %max. | 1 | 1 | 1 | 1 | 1 | |
| Note:AII the items in the table are inspected after removal of water before ignition | ||||||
Samarium Oxide (Sm₂O₃) is a pale yellow powder celebrated for its exceptional magnetic properties and role in optoelectronic devices. With a CAS number of 12060-58-1 and a molecular weight of 348.72 g/mol, this rare-earth oxide offers purity levels of 99.9%-99.99% (4N), featuring a melting point of 2262°C and a density of 7.40 g/cm³. Its strong ferromagnetic behavior at low temperatures and efficient light absorption in the visible spectrum make it a cornerstone material in permanent magnets, laser crystals, and optical filters.
1. High Magnetic Moment: Sm³+ ions exhibit a large magnetic moment (0.8 μB), critical for producing samarium-cobalt (SmCo) permanent magnets with coercivity up to 30 kOe, ideal for high-temperature environments.
2. Optical Absorption: Strong absorption bands in the 400-700 nm range enable use as a spectral filter in analytical instruments, blocking specific wavelengths to improve measurement accuracy.
3. Thermal Stability: Maintains structural integrity in oxidizing atmospheres up to 1800°C, suitable for thermal barrier coatings in gas turbine components.
4. Controllable Particle Size: Available in nanoscale (50-100 nm) and micron-scale (1-5 μm) distributions to optimize packing density in magnet powders and ceramic composites.
5. Low Rare-Earth Impurities: Strict control of adjacent lanthanides (Eu, Gd, Nd < 0.05%) ensures consistent magnetic and optical performance across batches.
• Permanent Magnets: A key component in SmCo5 and Sm2Co17 magnets, used in aerospace actuators, wind turbine generators, and military-grade navigation systems, where high temperature resistance (up to 500°C) and corrosion stability are essential.
• Laser Technology: Doped into yttrium-aluminum garnet (YAG) crystals to create Sm:YAG lasers, emitting at 1.06 μm for rangefinders and material processing, leveraging its low quantum defect for efficient energy conversion.
• Optical Glass: Improves refractive index and Abbe number in precision lenses for microscopes and telescopes, reducing chromatic aberration and enhancing image clarity.
• Catalysis: Supports for automotive exhaust catalysts, promoting NOx reduction by enhancing the redox activity of precious metal nanoparticles (Pt, Pd) through strong metal-oxide interactions.
• Thermoelectric Materials: Mixed with tellurium and selenium to form Sm-doped thermoelectric alloys, converting waste heat to electricity with improved figure of merit (ZT) in industrial waste recovery systems.
Q: What is the main advantage of SmCo magnets over NdFeB magnets?
A: SmCo magnets offer superior temperature stability (retaining 90% of flux at 300°C) and corrosion resistance, making them ideal for harsh environments where NdFeB magnets might degrade.
Q: Can Samarium Oxide be used in upconversion materials?
A: Yes, when combined with Yb³+ and Er³+ ions, it enables near-infrared to visible upconversion for anti-counterfeiting inks and biomedical imaging probes.
Q: How is particle size controlled during synthesis?
A: We use sol-gel and spray-drying techniques to engineer particle morphology, with nanoscale products suitable for thin-film deposition and micron-scale for magnet powder metallurgy.
Q: What is the shelf life under standard storage conditions?
A: Sealed in dry nitrogen-filled containers, Sm₂O₃ remains stable for 5+ years at <25°C and <40% RH; avoid prolonged exposure to humid air to prevent surface hydroxylation.
Q: Are there any radioactive concerns with Samarium Oxide?
A: No, natural samarium contains non-radioactive isotopes (⁵⁸Sm, ⁶⁰Sm), and the material is classified as non-hazardous for industrial handling.
Material name | Samarium Oxide |
Formula | Sm2O3 |
CAS No. | 12060-58-1 |
EINECS NO. | 235-043-6 |
Molecular Weight | 348.80 |
Density | 8.34 g/cm3 |
Melting point | 2325°C |
Appearance | Pale yellow powder |
Purity/Specification (Sm2O3/REO) | 99%-99.999% |
Solubility | Insoluble in water, soluble in inorganic acids |
| Samarium Oxide Sm2O3 | ||||||
| Purity | 2N | 2N5 | 3N | 3N5 | 4N | |
| TREO%min. | 99 | 99 | 99 | 99 | 99 | |
| Sm²O3/TREO%min. | 99 | 99.5 | 99.9 | 99.95 | 99.99 | |
| Rare earth impurities %max. | Pr6O11 | subtotal 1 | subtotal 0.5 | subtotal 0.1 | Eu203 max. 0.0050, other REO subtota max:0.050 | 0.001 |
| Nd₂O3 | 0.0035 | |||||
| Eu₂O3 | 0.001 | |||||
| Gd₂O3 | 0.001 | |||||
| Y₂O3 | 0.001 | |||||
| other REO | subtotal 0.0025 | |||||
| Non rare earth impurities %max. | Fe₂O3 | 0.003 | 0.01 | 0.001 | 0.0005 | 0.0003 |
| SiO₂ | 0.03 | 0.01 | 0.005 | 0.005 | 0.003 | |
| Cao | 0.05 | 0.03 | 0.01 | 0.008 | 0.005 | |
| Al₂O3 | 0.04 | 0.03 | 0.02 | 0.02 | 0.01 | |
| CI | 0.03 | 0.02 | 0.01 | 0.01 | 0.01 | |
| L.O.I %max. | 1 | 1 | 1 | 1 | 1 | |
| Note:AII the items in the table are inspected after removal of water before ignition | ||||||
