Screen-printable dielectric composition

Claim 2

A dielectric powder composition for making hermetic dielectrics having an insulation resistance (IR) drop of no more than one order of magnitude after immersion in water at 50° C. for 10 days 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 1+ Fe 2+ Fe 3+ Pb 2+ Zn 2+ and the anion F - and mixtures thereof, and (c) a low temperature melting devitrifiable glass or frit having a specific viscosity (log η) at the firing temperature of less than 6 and in which the relative proportions of the components, by weight, are 30-90% (a) 10-35% (b) and 1-7% (c).

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 O 4 and 10-30% by weight GeO 2 .

Claim 7

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

Claim 8

A screen-printable dielectric composition for making hermetic dielectrics having an insulation resistance (IR) drop of no more than one order of magnitude after immersion in water at 50° C. for 10 days 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 1+ Fe 2+ Fe 3+ Pb 2+ Zn 2+ and the anion F - and mixtures thereof and (c) a low temperature melting devitrifiable glass or frit dispersed in an inert liquid vehicle, the glass or frit having a specific viscosity (log η) at the firing temperature of less than 6, and in which the relative proportions of the components, by weight, are 30-90% (a) 10-35% (b) and 1-7% (c).

Claim 9

A screen-printable dielectric composition for making hermetic dielectrics having an insulation resistance (IR) drop of no more than one order of magnitude after immersion in water at 50° C. for 10 days 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 1+ Fe 2+ Fe 3+ Pb 2+ Zn 2+ and the anion F - and mixtures thereof and (c) a low temperature melting devitrifiable glass or frit dispersed in an inert liquid vehicle, the glass or frit having a specific viscosity (log η) at the firing temperature of less than 6, and in which the relative proportions of the components, by weight, are 30-90% (a) 10-35% (b) and 1-7% (c).

Claim 10

The composition of claim 7 in which the value of X in the substituted perovskite is from 0.3 to 0.6.

Claim 11

The composition of claim 7, in which the inorganic dopant is a mixture of lead oxalate, iron oxide and zinc fluoride.

Claim 12

The composition of claim 7 in which the glass has a softening point below 850° C.

Claim 13

The composition of claim 8 in which the glass is 50-80% by weight Pb 3 O 4 and 10-30% by weight GeO 2 .

Claim 14

The composition of claim 7 in which the glass is a Bi 2 O 3 frit.

Claim 15

An hermetic dielectric film comprising the composition of claim 8 which has been fired at below 900° C. to remove the inert liquid and to effect liquid phase sintering and cooled to effect devitrification of the glass.

Claim 16

The film of claim 13 in which the value of X in the substituted perovskite is from 0.3 to 0.6.

Claim 17

The film of claim 13 in which the inorganic dopant was a mixture of lead oxalate, iron oxide and zinc fluoride.

Claim 18

The film of claim 13 in which the glass has a softening point below 850° C.

Claim 19

The film of claim 15 in which the glass is 50-80% by weight Pb 3 O 4 and 10-30% by weight GeO 2 .

Claim 20

The film of claim 13 in which the glass was a Bi 2 O 3 frit.

Claim 21

An hermetic capacitor having an insulation resistance (IR) drop of no more than one order of magnitude after immersion in water at 50° C. for 10 days and comprising (1) a first conductor terminal on which was 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 1+ Fe 2+ Fe 3+ Pb 2+ Zn 2+ and the anion F - and mixtures thereof, and (c) a low temperature melting devitrifiable glass or frit, the assemblage having been cofired at below 900° C. to remove the inert liquid therefrom and to effect liquid phase sintering and cooled to effect devitrification of the glass or frit having a specific viscosity (log η) at the firing temperature of less than 6, and in which the relative proportions of the components, by weight, are 30-90% (a) 10-35% (b) and 1-7% (c).

Claim 22

An hermetic capacitor having an insulation resistance (IR) drop of no more than one order of magnitude after immersion in water at 50° C. for 10 days and comprising (1) a first conductor terminal on which was 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 1+ Fe 2+ Fe 3+ Pb 2+ Zn 2+ and the anion F - and mixtures thereof, and (c) a low temperature melting devitrifiable glass or frit, the assemblage having been cofired at below 900° C. to remove the inert liquid therefrom and to effect liquid phase sintering and cooled to effect devitrification of the glass or frit having a specific viscosity (log η) at the firing temperature of less than 6, and in which the relative proportions of the components, by weight, are 30-90% (a) 10-35% (b) and 1-7% (c).

Claim 23

An hermetic multilayer capacitor having an insulation resistance (IR) drop of no more than one order of magnitude after immersion in water at 50° C. for 10 days and 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 1+ Fe 2+ Fe 3+ Pb 2+ Zn 2+ and the anion F - and mixtures thereof, and (c) a low temperature melting devitrifiable glass or frit, the assemblage having been cofired at below 900° C. to remove the inert liquid therefrom and to effect liquid phase sintering and cooled to effect devitrifcation of the glass or frit having a specific viscosity (log η) at the firing temperature of less than 6, and in which the relative proportions of the components, by weight, are 30-90% (a) 10-35% (b) and 1-7% (c).

Claim 24

An hermetic multilayer capacitor having an insulation resistance (IR) drop of no more than one order of magnitude after immersion in water at 50° C. for 10 days and 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 1+ Fe 2+ Fe 3+ Pb 2+ Zn 2+ and the anion F - and mixtures thereof, and (c) a low temperature melting devitrifiable glass or frit, the assemblage having been cofired at below 900° C. to remove the inert liquid therefrom and to effect liquid phase sintering and cooled to effect devitrifcation of the glass or frit having a specific viscosity (log η) at the firing temperature of less than 6, and in which the relative proportions of the components, by weight, are 30-90% (a) 10-35% (b) and 1-7% (c).