SU1028644A1 - Batch for making ferroelectric ceramic material - Google Patents

Abstract

THE CHARGE FOR THE MANUFACTURE OF A FERROCERAMIC MATERIAL, including barium titanate, niobium pentoxide. I, dysprosium oxide, ytterbi oxide; and manganese carbon dioxide, due to the fact that, with a whole increase in the dielectric constant, specific volume resistance and decrease in the tangent-angle of dielectric loss, it additionally contains praseodymium oxide and titanium dioxide at the following component ratio , wt.%: Titanium 94.5-97.5 bari. . . Ptoxide 1,4-2,0 niobium Oxide 0.1-1.0 dysprosium Oxide 0.05-0.3 ytterbium Carbonic acid 0-, 05-0.3 manganese Oxide (/) C 0.2-1.5 Praseodymium Dioxide 0.1-1.0 titanium

Description

The invention relates to electronic equipment and can be used in the manufacture of multilayer monolithic ceramic capacitors with palladium electrodes.

For industrialization, it is necessary to have monolithic capacitors with a higher specific capacity, higher insulation resistance at 125 ° C, a lower tangent of dielectric loss angle, and palladium instead of platinum-deficient platinum to be used as electrodes.

A capacitor ferroelectric material is known, including, wt%: barium titanate 94-98, oxo niobium 0.5-3, samarium oxide 0.4-3, ytterbium oxide 0.1-1, the dielectric constant of which is equal to 2500-2800 ° eleven

The closest to the proposed technical essence and the achieved result is a ferroelectric ceramic material comprising, in wt.%:

Titanate

bari 93,5-97,5

P thioxide

niobium 1.0-3.5

Dioxide

cerium 0.05-1.0

Oxide

Dysprosis 0.3-2.0

Oxide

Ytterbie 0.05-0.6

Carbonic

manganese 0.1-0.4

This material has a dielectric constant value, 2500-2800, specific volume resistance at 125 ° С J) 1-10 8-10 Ohm-cm, the dielectric loss tangent is 0.012-0.0188 2.

However, this material does not provide a dielectric constant of more than 2800, a specific volume resistance at 125 ° C more than 8102 cm, and also a tangent of dielectric loss less than 0.012.

The purpose of the invention is to increase the dielectric constant, adequate volume resistance and decrease the dielectric loss tangent.

This goal is achieved by the fact that the charge for the manufacture of a ferroelectric material, including barium titanate, PENTIUM niobium, dysprosium oxide, ittebium oxide and manganese carbon dioxide, additionally contains praseodymium oxide and titanium dioxide in the following ratio of components, wt.%: Titanate

barium and -94,5-97,5 niobium thioxide, 1.4-2.0

Oxide

dysprosis 0.1-1.0

Oxide

Ytterbie 0.05-0.3

Carbonic

manganese 0.05-0.3

Oxide

praseodymium 0.2-1.5

Dioxide

titanium 0.1-1.0

The components of the mixture are stirred in a vibrating mill for 2–3 hours, resulting in a fine powder, to which polyvinyl alcohol is added to Ute, or a rubber solution, and then samples are prepared either by pressing a disk or CAST through a filler plate on which the electrodes are applied. Samples are fired at 1360D420 ° C for 2-4 hours and receive disk or monolithic capacitor blanks from the proposed ferroelectric material.

The reality and optimality of the claimed ratio of ingredients is confirmed by the following examples for the minimum, maximum and average wt.%.

Example 1 (at minimum) Barium titanate in the amount of (94.5) is loaded into the vibromill in the form of powders (94.5, then niobium pyrone 1.4, dysprosium oxide .1.0, 0.3 ytterium oxide, 0.3, manganese carbonate 0.3) are added to it. , praseodymium oxide 1.5 and titanium dioxide 1.0.

In this case, the characteristics of the material will be as follows: dielectric constant at 28 ° C 2850, specific volume resistance at p 2-10 OMSM, tangent of dielectric loss angle at 2 0 s, 008.

EXAMPLE 2 0.05, praseodymium oxide 0.2 and titanium dioxide 0.1,

The material characteristics in this case will be the following: dielectric constant at 20 ° C B 32; specific volume resistance at 125 ° C p 102 102 ohm-cm; the dielectric loss tangent at 0.012.

EXAMPLE 3 (by average value); Barium titanate in the amount of 96.0 is loaded into the vibromill in the form of powders, then PENTIOX niobium 1.7, dysprosium oxide 0.55, ytterbium oxide 0.175, carbonic manganese are added to it 0.175, praseodymium oxide 0.85 and titanium dioxide 0.55.

In this case, the characteristics of the material will be the following: dielectric constant at 3000 unit volume resistance at ip 9 10 6 m-cm, - dielectric loss tangent at 20С p 0.0095.

The condensers made of this material have a high one hundred “capacity, according to the group, H20-NZO, in the temperature range -BO + 125 C.

Higher electrical characteristics of the proposed material allow to obtain high-quality

capacitors with a higher specific capacity, with high insulation resistance at elevated temperatures and with a lower value of the tangent of the dielectric loss angle.

In addition, the absence of deficient bismuth oxide in the composition of the proposed material makes it possible to obtain monolithic capacitors with cheaper ASM electrodes, and not with platinum deficiencies, which leads to cost savings of precious metals.

Claims (1)

MIXTURE FOR THE PRODUCTION OF FERROCERAMIC MATERIAL, including barium titanate, niobium pentoxide. 1, dysprosium oxide, ytterbium oxide and manganese carbonate, due to the fact that, in order to increase the dielectric constant and specific volume resistance to reduce the dielectric loss tangent, it additionally contains praseodymium oxide and titanium dioxide in the following ratio of components, wt.%: 94.5-97.5 1.4-2.0 0.1-1.0 0.05-0.3 0.05-0.3 0.2-1.5 0.1-1.0 Tit gtp at barium. Niobium pentoxide Dysprosium oxide Ytterbium oxide Manganese carbonate Praseodymium oxide Titanium dioxide _IW .SU .1028644 1028644 ’