Screen-printable dielectric composition

Claim 2

A dielectric powder composition consisting essentially of a finely divided admixture of (a) a substituted perovskite of the formula Ba 1-x Sr x TiO 3 wherein X is from 0.1 to 0.9, (b) at least one inorganic dopant containing an ionic species selected from the cations Bi 3+ Ca 2+ Cs 2+ Fe 2+ Fe 3+ Pb 2+ and the anion F - and mixtures thereof, and (c) a low temperature melting devitrifiable glass or frit.

Claim 3

The composition of claim 1 in which the value of X in the substituted perovskite is from 0.3 to 0.6.

Claim 4

The composition of claim 1 in which the inorganic dopant is a mixture of lead oxalate, iron oxide and zinc fluoride.

Claim 5

The composition of claim 1 in which the glass has a softening point below 850°C.

Claim 6

The composition of claim 1 in which the glass is 50-80% by weight Pb 3 0 4 and 30% by weight Ge 0 2 .

Claim 7

The composition of claim 1 in which the glass is a Bi 2 O 3 frit.

Claim 8

The composition of claim 1 in which the relative proportions of the components, by weight, are (a) 30-90% (b) 10-35% and (c) 1-7%.

Claim 9

A screen-printable dielectric composition consisting essentially of a finely divided admixture of (a) a substituted perovskite of the formula Ba 1-x Sr x TiO 3 wherein X is from 0.1 to 0.9, (b) at least one inorganic dopant containing an ionic species selected from the cations Bi 3+ Ca 2+ Cs 2+ Fe 2+ Fe 3+ Pb 2+ and the anion F and mixtures thereof and (c) a low temperature melting devitrifiable glass or frit dispersed in an inert liquid vehicle.

Claim 10

A screen-printable dielectric composition consisting essentially of a finely divided admixture of (a) a substituted perovskite of the formula Ba 1-x Sr x TiO 3 wherein X is from 0.1 to 0.9, (b) at least one inorganic dopant containing an ionic species selected from the cations Bi 3+ Ca 2+ Cs 2+ Fe 2+ Fe 3+ Pb 2+ and the anion F and mixtures thereof and (c) a low temperature melting devitrifiable glass or frit dispersed in an inert liquid vehicle.

Claim 11

The composition of claim 8 in which the value of X in the substituted perovskite is from 0.3 to 0.6.

Claim 12

The composition of claim 8 in which the inorganic dopant is a mixture of lead oxalate, iron oxide and zinc fluoride.

Claim 13

The composition of claim 8 in which the glass has a softening point below 850°C.

Claim 14

The composition of claim 8 in which the glass is 50 - 80% by weight P b 3 0 4 and 30% by weight Ge 0 2 .

Claim 15

The composition of claim 8 in which the glass is a Bi 2 0 3 frit.

Claim 16

The film of claim 8 in which the relative proportions of the components, by weight, are (a) 30-90% (b) 10-35% and (c) 1-7%.

Claim 17

An hermetic dielectric film comprising the composition of claim 8 which has been fired to remove the inert liquid and to effect liquid phase sintering and cooled to effect devitrification of the glass.

Claim 18

The film of claim 15 in which the value of X in the substituted perovskite is from 0.3 to 0.6.

Claim 19

The film of claim 15 in which the inorganic dopant is a mixture of lead oxalate, iron oxide and zinc fluoride.

Claim 20

The film of claim 15 in which the glass has a softening point below 850°C.

Claim 21

The film of claim 15 in which the glass is 50-80% by weight Pb 3 0 4 and 30% by weight G e0 2 .

Claim 22

The film of claim 15 in which the glass is a Bi 2 O 3 frit.

Claim 23

The film of claim 15 in which the relative proportions of the components, by weight, are (a) 30-90% (b) 10-35% and (c) 1-7%.

Claim 24

A capacitor comprising (1) a first conductor terminal on which is printed (2) an hermetic dielectric film and (3) a second conductor terminal overlying the dielectric layer, the dielectric film consisting of (a) a substituted perovskite of the formula Ba 1-x Sr x TiO 3 wherein X is from 0.1 to 0.9, (b) at least one inorganic dopant containing an ionic species selected from the cations Bi 3+ Ca 2+ Cs 2+ Fe 2+ Fe 3+ Pb 2+ and the anion F - and mixtures thereof, and (c) a low temperature melting devitrifiable glass or frit, the assemblage having been cofired to remove the inert liquid therefrom and to effect liquid phase sintering and cooled to effect devitrification of the glass or frit.

Claim 25

A capacitor comprising (1) a first conductor terminal on which is printed (2) an hermetic dielectric film and (3) a second conductor terminal overlying the dielectric layer, the dielectric film consisting of (a) a substituted perovskite of the formula Ba 1-x Sr x TiO 3 wherein X is from 0.1 to 0.9, (b) at least one inorganic dopant containing an ionic species selected from the cations Bi 3+ Ca 2+ Cs 2+ Fe 2+ Fe 3+ Pb 2+ and the anion F - and mixtures thereof, and (c) a low temperature melting devitrifiable glass or frit, the assemblage having been cofired to remove the inert liquid therefrom and to effect liquid phase sintering and cooled to effect devitrification of the glass or frit.

Claim 26

A multilayer capacitor comprising a first conductor terminal and a plurality of alternating printed dielectric films and overlying conductor terminals. The dielectric film consisting essentially of (a) a substituted perovskite of the formula Ba 1-x Sr x TiO 3 wherein X is from 0.1 to 0.9, (b) at least one inorganic dopant containing an ionic species selected from the cations Bi 3+ Ca 2+ Cs 2+ Fe 2+ Fe 3+ Pb 2+ and the anion F and mixtures thereof, and (c) a low temperature melting devitrifiable glass or frit, the assemblage having been cofired to remove the inert liquid therefrom and to effect liquid phase sintering and cooled to effect devitrification of the glass or frit.

Claim 27

A multilayer capacitor comprising a first conductor terminal and a plurality of alternating printed dielectric films and overlying conductor terminals. The dielectric film consisting essentially of (a) a substituted perovskite of the formula Ba 1-x Sr x TiO 3 wherein X is from 0.1 to 0.9, (b) at least one inorganic dopant containing an ionic species selected from the cations Bi 3+ Ca 2+ Cs 2+ Fe 2+ Fe 3+ Pb 2+ and the anion F and mixtures thereof, and (c) a low temperature melting devitrifiable glass or frit, the assemblage having been cofired to remove the inert liquid therefrom and to effect liquid phase sintering and cooled to effect devitrification of the glass or frit.