Low-K and mid-K LTCC dielectric compositions and devices
View Patent ↗LTCC devices are produced from dielectric compositions comprising a mixture of precursor materials that, upon firing, forms a dielectric material comprising a barium-tungsten-silicon host.
1. A fired lead-free and cadmium-free dielectric material comprising, prior to firing:
(a) 80-90.9 wt % of a calcined host material comprising:
(i) 30-50 wt % BaO,
(ii) 45-65 wt % WO 3 ,
(iii) 1-10 wt % SiO 2 ,
(iv) no lead, and
(v) no cadmium,
(b) 8-13 wt % BaSiO 3 ,
(c) 0.5-3 wt % BaCO 3 ,
(d) 0.5-3 wt % H 3 BO 3 ,
(e) 0.1-1 wt % LiF, and
(f) 0 to 0.5 wt % CuO,
or oxide equivalents of any of the foregoing.
2. A fired lead-free and cadmium-free dielectric material comprising, prior to firing:
(a) 90-99.8 wt % of a calcined host material comprising:
(i) 30-50 wt % BaO,
(ii) 45-65 wt % WO 3 ,
(iii) 1-10 wt % SiO 2 ,
(iv) no lead, and
(v) no cadmium,
(b) 0.2-3 wt % BaCO 3 ,
(c) 0-3 wt % H 3 BO 3 ,
(d) 0-1 wt % LiF,
(e) 0-0.5 wt % CuO,
(f) 0-1.5 wt % Li 2 CO 3 , and
(g) 0-1 wt % SiO 2 ,
or oxide equivalents of any of the foregoing.
3. A fired lead-free and cadmium-free dielectric material comprising, prior to firing:
(a) 37-99.7 wt % of a calcined host material comprising:
(i) 30-50 wt % BaO,
(ii) 45-65 wt % WO 3 ,
(iii) 1-10 wt % SiO 2 ,
(iv) no lead, and
(v) no cadmium,
(b) 0.1-2 wt % BaCO 3 ,
(c) 0.1-5 wt % H 3 BO 3 ,
(d) 0 to 1 wt % CuO,
(e) 0.1-2 wt % Li 2 CO 3 ,
(f) 0-5 wt % SiO 2 ,
(g) 0-1 wt % ZrO 2 ,
(h) 0-10 wt % ZnO,
(i) 0-15 wt % SrTiO 3 , and
(j) 0-50 wt % CaTiO 3 ,
or oxide equivalents of any of the foregoing.
4. A fired electric or electronic component comprising the lead-free and cadmium-free dielectric material of claim 1 , together with a conductive paste comprising:
a. 60-90 wt % Ag+Pd+Pt+Au,
b. 1-10 wt % of an additive selected from the group consisting of silicides, carbides, nitrides, and borides of transition metals,
c. 0.5-10 wt % of at least one glass frit, and
d. 10-40 wt % of an organic portion.
5. The fired electric or electronic component of claim 4 , wherein the electric or electronic component is selected from the group consisting of high Q resonators, electro-magnetic interference filter, band pass filters, wireless packaging systems, and combinations thereof.
6. A fired multi-layer electronic component comprising at least one first layer of the dielectric material of claim 1 having a dielectric constant greater than 10 in combination with at least one alternating separate layer of having a dielectric constant of less than 10 wherein alternating layers have differing dielectric constants.
7. A fired lead-free and cadmium-free dielectric composition comprising, prior to firing:
(a) 80-90.9 wt % of a calcined host material comprising:
(i) 30-45 wt % BaO,
(ii) 50-60 wt % WO 3 ,
(iii) 1-10 wt % SiO 2 ,
(iv) no lead, and
(v) no cadmium,
(b) 8-13 wt % BaSiO 3 ,
(c) 0.5-3 wt % BaCO 3 ,
(d) 0.5-3 wt % H 3 BO 3 ,
(e) 0.1-1 wt % LiF, and
(f) 0 to 0.5 wt % CuO,
or oxide equivalents of any of the foregoing.
8. A fired lead-free and cadmium-free dielectric composition comprising, prior to firing:
(a) 90-98.5 wt % of a calcined host material comprising
(i) 30-45 wt % BaO,
(ii) 50-60 wt % WO 3 ,
(iii) 1-10 wt % SiO 2 ,
(iv) no lead, and
(v) no cadmium,
(b) 0.5-2 wt % BaCO 3 ,
(c) 1-3 wt % H 3 BO 3 ,
(d) 0-1 wt % LiF,
(e) 0 to 0.5 wt % CuO,
(f) 0-1 wt % Li 2 CO 3 , and
(g) 0-1 wt % SiO 2 ,
or oxide equivalents of any of the foregoing.
9. A fired lead-free and cadmium-free dielectric composition comprising, prior to firing:
(a) 87-98.9 wt % of a calcined host material comprising:
(i) 30-50 wt % BaO,
(ii) 45-65 wt % WO 3 ,
(iii) 1-10 wt % SiO 2 ,
(iv) no lead, and
(v) no cadmium,
(b) 0.8-1.5 wt % BaCO 3 ,
(c) 0.3-1 wt % H 3 BO 3 ,
(d) 0-1 wt % LiF,
(e) 0 to 0.5 wt % CuO,
(f) 0.1-0.8 wt % Li 2 CO 3 ,
(g) 0-5 wt % SiO 2 ,
(h) 0-1 wt % ZrO 2 , and
(i) 0-10 wt % CaTiO 3 ,
or oxide equivalents of any of the foregoing.
10. A fired lead-free and cadmium-free dielectric composition comprising:
(a) 20-70 wt % BaO,
(b) 20-70 wt % WO 3 ,
(c) 0.1-10 wt % SiO 2 ,
(d) 0-10 wt % CaO,
(e) 0-10 wt % TiO 2 ,
(f) 0.10-5 wt % B 2 O 3 ,
(g) 0.1-5 wt % Li 2 O, and
(h) 0.1-5 wt % LiF.
11. A fired electric or electronic component comprising the lead-free and cadmium-free dielectric material of claim 10 , together with a conductive paste comprising:
(a) 60-90 wt % Ag+Pd+Pt+Au,
(b) 1-10 wt % of an additive selected from the group consisting of silicides, carbides, nitrides, and borides of transition metals,
(c) 0.5-10 wt % of at least one glass frit,
(d) 10-40 wt % of an organic portion.
12. The fired electric or electronic component of claim 11 , wherein the electric or electronic component is selected from the group consisting of high Q resonators, band pass filters, wireless packaging systems, and combinations thereof.