• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1991.10a
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• pp.33-36
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• 1991

For its outstanding magnetic property, preparations of MnZn ferrite were studied with various method. In this study, MnZn ferrite powders were prepared from ammonium oxalate and mixed metal sulfate by the controlled coprecipitation process. Considering to low dissolved each metal ion, high production yield and particle size, the established optimum reaction conditon by the statistical analysis of each results are that reaction temperature is $25^{\circ}C$, concentration of metal sulfate is 0.3M, molar ratio of ammonium oxalate/metal sulfate is 1.1:1. The effective experimental factor and characterization of the precipitated powder at optimum condition were studied.

• Journal of the Korean Ceramic Society
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• v.34 no.4
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• pp.394-398
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• 1997

Mn-Zn ferrite powders were prepared by alcoholic dehydration, using coprecipitation method. Then the effects of organic dispersant and polymeric binder concentration on stability and casting of slurry were discussed. Citric acid, the organic dispersant and polyvinylacohol(PVA), the non-ionic binder, were selected as additives of slurry. With variation of concentration of water, citric acid and polyvinylalcohol(PVA), optimum forming conditions were determined from viscosity and density. To compare with dry process, density and microstructure of sintered body formed by uniaxial die pressing were observed.

• Journal of the Korean Ceramic Society
• /
• v.44 no.5 s.300
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• pp.166-172
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• 2007

In this study, magnetic properties of the strontium ferrite were theoretically investigated by Ab initio (first principle) method. The influences of various additives on the magnetic properties of the strontium ferrite were analyzed to designed new composition of the strontium ferrite system with high magnetic characteristics. As shown in the results, the total magnetization of the strontium ferrite was $42.55M_B$. Based on the DOS results, the magnetic characteristics of the strontium ferrite were mainly influenced by Fe atoms at 6 positions in the unit cell. Also the La-Mn strontium ferrite has the superior magnetic property than the Mn strontium ferrite.

• Proceedings of the Materials Research Society of Korea Conference
• /
• 1999.11a
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• pp.119-119
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• 1999

• Proceedings of the Korean Ceranic Society Conference
• /
• 2000.10a
• /
• pp.89.2-89
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• 2000

• Proceedings of the Materials Research Society of Korea Conference
• /
• 1996.11a
• /
• pp.18-18
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• 1996

• Proceedings of the Korean Magnestics Society Conference
• /
• 1991.11a
• /
• pp.64-64
• /
• 1991

• Proceedings of the Korean Magnestics Society Conference
• /
• 2004.06a
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• pp.88-88
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• 2004

• Proceedings of the Materials Research Society of Korea Conference
• /
• 1996.05a
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• pp.145-145
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• 1996

• Proceedings of the Korean Magnestics Society Conference
• /
• 1995.05a
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• pp.60-61
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• 1995