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Synthesis of Strontium Ferrite Ultrafine Particles Using Microemulsion Processing
Dong-Hwang Chen1, Yuh-Yuh Chen
1Department of Chemical Engineering, National Cheng Kung University, Tainan, Taiwan, 701, Republic of China
Journal of Colloid and Interface Science
|March 20, 2001
Summary
Strontium ferrite ultrafine particles were synthesized using microemulsion processing. The resulting particles exhibit magnetic properties suitable for high-density perpendicular recording media.
Area of Science:
- Materials Science
- Nanotechnology
- Magnetism
Background:
- Microemulsion processing offers a route to synthesize ultrafine particles.
- Strontium ferrite is a magnetic material with potential applications in data storage.
Purpose of the Study:
- To prepare strontium ferrite ultrafine particles using microemulsion processing.
- To characterize the structural and magnetic properties of the synthesized particles.
Main Methods:
- Microemulsion processing involving coprecipitation of Sr(2+) and Fe(3+).
- Thermochemical analysis using Thermogravimetric Analysis/Differential Thermal Analysis (TGA/DTA).
- Phase analysis using X-ray Diffraction (XRD).
- Particle size analysis using Transmission Electron Microscopy (TEM).
- Magnetic property characterization using a SQUID magnetometer.
Main Results:
- Pure strontium ferrite was obtained after calcination at 700°C for 5 hours.
- Particle sizes of the precursor and calcined strontium ferrite were 3.8±0.7 nm and 50-100 nm, respectively.
- Key magnetic properties included saturation magnetization of 55 emu/g, remanent magnetization of 28 emu/g, coercivity of 492 Oe, and a squareness ratio of 0.51.
- Magnetization increased with decreasing temperature from 5-400 K.
Conclusions:
- Microemulsion processing is an effective method for producing strontium ferrite ultrafine particles.
- The synthesized strontium ferrite exhibits magnetic properties, including low coercivity, indicating potential for high-density perpendicular recording media.