Compositions – Magnetic – Iron-oxygen compound containing
Reexamination Certificate
2005-05-31
2005-05-31
Koslow, C. Melissa (Department: 1755)
Compositions
Magnetic
Iron-oxygen compound containing
C252S062590, C501S152000, C264S611000
Reexamination Certificate
active
06899819
ABSTRACT:
The present research provides a high-density magnetic ceramic composition for microwave application and a preparation method thereof. The magnetic ceramic composition of this research includes Yttrium iron garnet (YIG, Y3Fe5O12) as its basic element and a little amount of additional element, silicon oxide (SiO2), which is expressed as: Y3Fe5O12+x SiO2(0.05≦x≦5 mol %). The magnetic ceramic composition is prepared by measuring proper amounts of ferric oxide (Fe2O3), yttrium oxide (Y2O3) and SiO2, mixing them, calcining the mixture, and molding and sintering them. Since the magnetic ceramic composition of the present research has very little magnetic loss, it can be used in components for communication in a microwave band, usefully.
REFERENCES:
patent: 3763045 (1973-10-01), Takamizawa et al.
patent: 06-279106 (1994-10-01), None
patent: 07-061821 (1995-03-01), None
“The Effect of Bi2O3 addition on themicrostructure and magnetic properties of YIG”, Y.Y. Song, et al., Journal of Magnetic Materials, 177-181 (1998) 257-258.
“Low temperature sintering of microwave magnetic garnet materials”, C. Tsay, et al., Journal of Magnetism and Magnetic Materials, 239 (2002) 490-494.
“Microwave Properties Of Hot Pressed YIG”, H. Igarashi, et al., Proceedings of the International Conference, Jul. 1970,Japan pp. 530-532.
Hahn Jin Woo
Jun Dong Suk
Kim Dong-Young
Lee Sang Seok
Blakely & Sokoloff, Taylor & Zafman
EG Co., Ltd.
Electronics and Telecommunications Research Institute
Koslow C. Melissa
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