Compositions: ceramic – Ceramic compositions – Titanate – zirconate – stannate – niobate – or tantalate or...
Reexamination Certificate
2008-01-01
2008-01-01
Kopec, Mark (Department: 1751)
Compositions: ceramic
Ceramic compositions
Titanate, zirconate, stannate, niobate, or tantalate or...
C505S110000, C333S161000, C250S250000
Reexamination Certificate
active
11491442
ABSTRACT:
This invention provides the three novel La,Fe, La,Cr and Sm,Fe substituted barium titanate solid solution ferroelectric compositions with the formula Ba1-xLnxTi1-xMxO3wherein when Ln is La, M is Fe or Cr, when Ln is Sm, M is Fe and x is from about 0.02 to about 0.06 and mixtures thereof, the novel La,Fe substituted barium strontium titanate solid solution ferroelectric compositions with the formula (Ba1-ySry)1-xLaxTi1-xFexO3wherein y is greater than zero and less than about 0.6 and x is from about 0.01 to about 0.06 and the novel La,Al substituted barium strontium titanate solid solution ferroelectric compositions with the formula (Ba1-ySry)1-xLaxTi1-x/4-3a/4Ala(x-a)/4O3whereindenotes a vacancy, y is greater than zero and less than about 0.6, a is from about 0.01 to about 0.06 and x is from 0.02 to about 0.10 with the proviso that x is greater than or equal to a.These low loss tunable ferroelectric compositions are especially useful in tunable microwave thin film devices which fall into three types: interdigital and trilayer capacitors, coplanar waveguides and microstrips.
REFERENCES:
patent: 5427998 (1995-06-01), Umemura et al.
patent: 5472935 (1995-12-01), Yandrofski et al.
patent: 63 301 409 (1988-12-01), None
patent: WO 01/83396 (2001-11-01), None
Li et al “Ferroelectric Tunability Studies in Doped BaTiO3 and Ba1−xSrxTiO3”, Materials Research Society Symposium Proceedings, Symposium GG (Solid State Chemistry of Inorganic Materials), Nov. 27-30, 2000.
Dong Li et al; Novel tunable ferroelectric compositions: Ba1-zLn2Ti1-gMgO3(Ln =La, Sm, Gd, Dy. M = Al, Fe, Cr);Solid State Sciences2 (2000), pp. 507-512; Elsevier.
S. Skapin et al; Chemical Reactions and Dielectric Properties of the BaTiO3—LaA1O3and BaTiO3—LaA1O3—LaTi3/4O3Systems;Journal of Solid State Chemistry129, pp. 223-230 (1997); Academic Press; Ljubljana. Slovenia.
J. Schwarzbach; Semiconducting Ceramic Barium Lanthanum Titanate Doped with Iron;Czech. J. Phys.; B 18 (1968), pp. 1322-1334.
A. Inoue, et al. Effect of Iron-Group-Ion Doping on the Properties of BaTiO3Ceramics, Institute of Applied Physics, (1991) pp. 2388-2390, vol. 30, No. 9B, Sakura, Ibaraki.
Hagermann, H.J., et al. Reversible Weight Change of Acceptor-Doped BaTiO3, Journal of the American Ceramic Society, (1981) pp. 590-594, Federal Republic of Germany.
Sengupta, et al. Breakthrough advances in low loss, tunable dielectric materials, Mat Res Innovat, (1999) pp. 278-282.
Li et al. Structural Charaterization of the Complex Perovskitas Ba1-xLaxTi1-xCrxO3, Journal of Solid State Chemistry, 164, 98-105 (2002).
I.H. Ismailzade et. al., The Magnetoelectric (ME) H Effect at the Ferroelectric and Antiferroelectric Phase Transitions, Department of Radiation Investigations, Academy of Sciences of the Azerbaidzhan SSR, Baku, (1980) pp. 191-194. Azerbaidzhan SSR, USSR.
Li et al “ferroelectric Tunability Studies in Doped Ba TIO3 and Ba1-xSrxTiO3”, Materials Research Society Symposium Proceedings. Symposium GG (Solid State Chemistry of Inorganic Materials), Nov. 27-30, 2000.
Li Dong
Subramanian Munirpallam Appadorai
E.I. du Pont de Nemours and Company
Kopec Mark
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