Sodium copper titanate compositions containing a rare earth,...

Details Sodium copper titanate compositions containing a rare earth,... Sodium copper titanate compositions containing a rare earth,...

2002-10-02

2004-04-27

Group, Karl (Department: 1755)

Compositions: ceramic

Ceramic compositions

Titanate, zirconate, stannate, niobate, or tantalate or...

C501S152000, C361S321500

Reexamination Certificate

active

06727199

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to novel compositions of the formula Na
0.5
M
0.5
Cu
3
Ti
4
O
12
wherein M is La—Lu, Y, Bi or mixtures thereof.
BACKGROUND OF THE INVENTION
The use of dielectric materials to increase capacitance is well known and long-used. Known capacitor dielectrics fall into two categories. One category of dielectrics has a relatively temperature-independent dielectric constant but the value of the dielectric constant is low, e.g. 5-10. Materials such as electrical porcelain and mica fall into this category. Another category of dielectrics has a very high dielectric constant, e.g. 1000 or more, but they are quite frequency dependent. An example is barium titanate (BaTiO
3
).
Since the capacitance is proportional to the dielectric constant, high dielectric constant materials are desired. In order to perform acceptably in electronic circuits, the dielectric must have a dielectric constant that exhibits minimal frequency dependence. It is also desirable to have the loss or dissipation factor as small as possible. The materials of this invention meets those needs.
SUMMARY OF THE INVENTION
This invention provides compositions of the formula Na
0.5
M
0.5
Cu
3
Ti
4
O
12
wherein M is La—Lu, Y, Bi or mixtures thereof. These compositions have high dielectric constant and low loss over a frequency range of from 1 kHz to 1 MHz and are especially useful in capacitors in electronic devices such as phase shifters, matching networks, oscillators, filters, resonators, and antennas comprising interdigital and trilayer capacitors, coplanar waveguides and microstrips.


REFERENCES:
International Search Report dated Aug. 12, 2003.
M.A. Subramanian, et al. “High Dielectric Constant in ACu3Ti4O12 and ACu3Ti3FeO12 Phases”, Journal of Solid State Chemistry, (2000), vol. 151, pp. 323-325, Maryland, No Month.
A.P. Ramnirez, et al., “Giant dielectric constant response in a copper-titanate”, Solid State Communications, (2000), vol. 115, pp. 217-220, New York, No Month.

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