Compositions: ceramic – Ceramic compositions – Titanate – zirconate – stannate – niobate – or tantalate or...
Patent
1998-09-01
2000-05-16
Group, Karl
Compositions: ceramic
Ceramic compositions
Titanate, zirconate, stannate, niobate, or tantalate or...
501139, 252 6263, 252 6264, 252 629PZ, C04B 3526, C04B 35468, C04B 3547
Patent
active
060637196
ABSTRACT:
A novel ceramic ferrite/ferroelectric composite material having a low dissipation factor, voltage tunability, and proper impedance matching for the incident medium. The material comprises ferrites doped with the ferroelectric Barium Strontium Titanate (BSTO) or ferrites doped with the ferroelectric Barium Strontium Titanate (BSTO)/MgO. Preferred composites are magnesium ferrites doped with BSTO and magnesium ferrites doped with BSTO/MgO. Most particularly, the inventive composites are comprised of magnesium ferrites doped with Ba.sub.1-x Sr.sub.x TiO.sub.3 and magnesium ferrites doped with Ba.sub.1-x Sr.sub.x TiO.sub.3 /MgO, wherein x is greater than 0.00, but less than or equal to 0.75, and wherein the percent weight ratio of magnesium ferrite to BSTO or BSTO/MgO is 60 to 95 percent ferrite to 40 to 5 percent BSTO or 60 to 95 percent ferrite to 40 to 5 percent BSTO/MgO ferroelectric. A particularly well suited composite, i.e., one having a .mu./.di-elect cons. ratio close to unity, comprises 80 weight percent magnesium ferrite and 20 weight percent BSTO/MgO, wherein said BSTO/MgO comprises 80 weight percent Ba.sub.0.6 Sr.sub.0.4 TiO.sub.3 combined with 20 weight percent MgO.
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Applicability of Effective medium Theory to Ferroelectric/Ferromagnetic Composites with Composition and Frequency-Dependent Complex Permittivities and Permeabilities., Joseph V. Mantese, Adolph L. Micheli, and Dennis F. Dungan, General Motors Research and Development Laboratories, Electrical and Electronics Department, 1996 American Institute of Physic S0021-8979(96)07303-X.
Sengupta Louise C.
Sengupta Somnath
Biffoni U. John
Clohan, Jr. Paul S.
Group Karl
The United States of America as represented by the Secretary of
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