Strontium Ferrite Powder (SrFe12O19) is the workhorse M-type hexaferrite behind the world’s ceramic permanent magnets, prized for its exceptional intrinsic coercivity, magnetocrystalline anisotropy, and outstanding resistance to demagnetisation and corrosion. Produced as a fine, high-purity magnetoplumbite-structured powder, it is engineered for consistent particle morphology and phase purity to support reliable pressing, sintering, and bonding into finished magnetic components. Infinita Materials supplies strontium ferrite powder across a range of particle size distributions and purity grades to meet the demands of motor, sensor, and microwave device manufacturers. Its low raw-material cost relative to rare-earth magnets, combined with strong performance and chemical stability, makes it the material of choice for high-volume, cost-sensitive permanent magnet applications. Each lot is characterised for phase composition, particle size, and magnetic response to ensure batch-to-batch consistency.
Strontium Ferrite (SrFe₁₂O₁₉) is a hard magnetic hexagonal ferrite with the magnetoplumbite structure (P6₃/mmc). Its multiple Fe sublattices couple ferrimagnetically, producing a strong uniaxial magnetocrystalline anisotropy along the c-axis and consequently high coercivity and resistance to demagnetisation. Unlike soft cubic spinel ferrites, its hard-magnetic behaviour is intrinsic to the crystal structure and is retained in fine powders. As a spray-grade powder, controlled particle size and morphology enable efficient alignment and compaction during dry or wet pressing. Strontium ferrite combines high coercivity, thermal stability, low cost, chemical inertness, and excellent corrosion resistance, making it widely used for permanent magnets in fractional-horsepower motors, loudspeakers, magnetic separators, holding magnets, and flexible or bonded magnet compounds.
Answer: Compared with other ferrites, strontium ferrite generally indicates a higher coercivity and thermal stability, so it is probably better suited for applications at high temperatures and in demanding environments.
Answer: Yes, because of its stable magnetic properties, strontium ferrite is extensively used in microwave devices and applications requiring high-frequency performance.
Strontium Ferrite (SrFe₁₂O₁₉) is a hard magnetic hexagonal ferrite with the magnetoplumbite structure (P6₃/mmc). Its multiple Fe sublattices couple ferrimagnetically, producing a strong uniaxial magnetocrystalline anisotropy along the c-axis and consequently high coercivity and resistance to demagnetisation. Unlike soft cubic spinel ferrites, its hard-magnetic behaviour is intrinsic to the crystal structure and is retained in fine powders. As a spray-grade powder, controlled particle size and morphology enable efficient alignment and compaction during dry or wet pressing. Strontium ferrite combines high coercivity, thermal stability, low cost, chemical inertness, and excellent corrosion resistance, making it widely used for permanent magnets in fractional-horsepower motors, loudspeakers, magnetic separators, holding magnets, and flexible or bonded magnet compounds.
Governs resistance to demagnetisation; the defining hard-magnetic property of hexaferrites
Remanence (Br)
~2,000 – 4,600 G (0.20 – 0.46 T), grade-dependent
Determines residual magnetic flux retained after magnetisation; sets usable magnet strength
Saturation Magnetisation (Ms)
~65 – 74 emu/g (single-crystal/powder)
Upper bound on achievable magnetisation; influences maximum energy product (BHmax)
Curie Temperature (Tc)
~450°C (723 K)
Temperature above which ferrimagnetic order and useful magnetism are lost
Particle Size (D50)
< 1.5 μm
Controls sinterability, packing density, and single-domain magnetic behaviour
Purity
99% – 99.9%
Minimizes secondary phases (e.g., α-Fe2O3, SrFe2O4) that degrade magnetic performance
Density (theoretical)
5.10 – 5.18 g/cm3
Reference value for calculating sintered/compact density and porosity
CAS Number
12023-91-5
Unique chemical registry identifier for procurement, safety documentation, and REACH/TSCA compliance
Types & Grades of Strontium Ferrite Powder
Strontium Ferrite powder is offered in standard catalogue grades and particle size distributions, with custom purity, morphology, and packaging available for OEM and R&D use.
Grade / Form
Typical Purity
Key Features / Uses
Standard Ceramic Grade
99.0% – 99.5%
General-purpose sintered anisotropic magnets for motors, speakers, and holding devices
High-Purity Magnetic Grade
99.5% – 99.9%
Reduced secondary-phase content for higher coercivity and remanence in premium magnet grades
Ultrafine/Nano Powder
99% – 99.5%, D50 < 200 nm
Bonded and flexible magnets, thin-film precursors, and research on single-domain particle behaviour
Bonded-Magnet Feedstock
99% – 99.5%, controlled morphology
Compounding with polymer binders for injection-moulded and extruded flexible magnets
Doped/Substituted Variants (La-Co, Al, Cr)
99% – 99.5%
Custom compositions engineered for enhanced coercivity or tuned anisotropy in speciality magnets
Applications of Strontium Ferrite Powder
Strontium Ferrite powder supports demanding roles across research and production applications where this material’s specific structural, electronic, magnetic, or electrochemical properties are the key requirement.
Industry
Application
Function
Automotive
Fractional-horsepower DC motors
Provides low-cost, stable permanent-magnet field for starter motors, window lifts, and pumps
Consumer Electronics
Loudspeaker and headphone magnets
Supplies the static magnetic field that drives voice-coil motion for sound reproduction
Industrial Equipment
Magnetic separators and lifting magnets
High coercivity ensures strong, stable field for separating ferrous contaminants and material handling.
Electronics Manufacturing
Holding, latching, and sensor magnets
Reliable remanent flux enables compact door latches, reed-switch actuation, and position sensors.
Telecommunications
Microwave isolators, circulators, and filters
Hexaferrite anisotropy supports non-reciprocal microwave device operation at GHz frequencies.
Renewable Energy
Small generators and wind-turbine auxiliary motors
Cost-effective, corrosion-resistant magnet material for continuous-duty rotating equipment
Why Partner with Infinita Materials?
Technical Depth: in-house quality control with ICP-MS and XRF purity verification, particle size distribution and density measurement, and full certificates of analysis on every lot.
Global Logistics: reliable supply from single R&D-scale quantities to production-line volumes, with established international shipping.
Responsive Support: direct access to materials engineers for grade, particle size, and packaging selection, and process-compatibility questions.
Take the Next Step
Infinita Materials manufactures Strontium Ferrite powder engineered to the purity, particle size, and morphology your process requires. Whether the requirement is a standard catalogue grade or a custom particle size distribution, purity, or packaging format, our team can help match the right specification to your process. Request a quote or speak with our technical team to discuss your material specification.
Other Related Product to Strontium Ferrite (SrFe12O19)
Compared with other ferrites, strontium ferrite generally indicates a higher coercivity and thermal stability, so it is probably better suited for applications at high temperatures and in demanding environments.
Yes, because of its stable magnetic properties, strontium ferrite is extensively used in microwave devices and applications requiring high-frequency performance.
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