Dielectric composites and methods of making such
AssigneeThe Hong Kong Polytechnic University
InventorsKarim Baba-Kishi-Zadeh, Cheuk-Wai Tai
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Abstract
Most of the dielectric ceramic compositions consist of three or more different lead-based or non-lead ceramics. These materials and their solid solutions can give high dielectric constants (er>10000) but the disadvantage is large fluctuations in the dielectric constant with increasing or decreasing temperature. Most applications of these materials are therefore concentrated on the utilization of their dielectric constants at a specific temperature. This invention provides a dielectric composite of the general formula (x)[Pb(In1/2Nb1/2)O3]:(1−x)[Pb(Mg1/3Nb2/3)O3] having improved stability of dielectric constant in the working temperature range.
Claims7
A composite comprising essentially of:
- lead indium niobate, [Pb(In1/2Nb1/2)O3];
- and
- lead magnesium niobate, [Pb(Mg1/3 Nb2/3)O3]
- at least one dopant metal ion to replace lead ion in an amount of 2 to 5 mole percent, said metal ion being selected from the group consisting of Ba, Sr, Ti, Yb, La, Na, and their combinations thereof
- and being expressed by the following general formula (x)[Pb(In1/2Nb1/2)O3]:(1−x)[Pb(Mg1/3Nb2/3)O3], where 0<x <1.
Dependencies are inferred from the claim text.