SU1033482A1 - High-frequency ceramic material for capacitors - Google Patents

Description

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The invention relates to electronic equipment and can be used in the manufacture of high-frequency ceramic capacitors of thermally stable TKE groups with an increased specific capacity. For the manufacture of high-frequency ceramic materials of thermostable TKE groups, both individual compounds and solid solutions are used, for example MgTiO, ZrTiO, Ca (Sn, Zr, Ti) 05, Ca (Ti, lr) 0, (CaLa) (T.iAe) 03 , Ba (Nd, $ 01) 3, and Ba (Nd, 01). The dielectric constant of the materials based on the above compounds is from 16 to 46-50. The use of material based on Ba (Nd, Sin) solid solution allows to obtain a dielectric constant of 80-85, and in the case of using Ba (Nd, Sm) 2, T solid solution (up to 85-90 units for thermostable NGOs and respectively, the NPO TKE group, the TKE group 0 3010 degrees (). Yug-CHOi GO; However, this material contains scarce rare-earth elements. The closest to the offer is a high-frequency capacitor ceramic material containing the following components, masD: Barium titanate (BaTiO) 26 , 5-29.5 Calcium Titanate (CaTtOj) 67.0- 70.0 Methaniobate barium (WANdOb) 0.2-0.5 Silica (SIO) .1.0-3.0 Magnesium oxide (MDO) .3-2.0 Known material along with the value of 170- 190 and low tg (G (2-5) 10., provides TKE from + 100.-10 degrees-3. A disadvantage of the known material is the instability of the temperature values of the dielectric constant coefficient (}) and the low value of specific volume resistance at elevated temperatures. So, at t 100-150 С, its size is about (2-5) 10 ° 0m1cm. The aim of the invention is to increase the specific volume resistivity and stabilize the temperature coefficient of the dielectric constant while maintaining its high values. This goal is achieved by the fact that a high-frequency capacitor ceramic material containing BaTu, CaTu3, MaO also contains in the following ratio of components, wt. %: VaTuZ 26.5-30.0 CaTiOs 67.0-70.5 VANUr 0.2-0.5 SiOz0, MgO0.3-1.0. LaAtO. . 0, S-0.9 As the starting components, specimens of calcium titanate, widely used in industrial production, and lanthanum aluminate were used. synthesized at 1300-13 ° С and, respectively, as well as barium carbonate, oxides of titanium, niobium, magnesium and silicon. The material was produced according to the usual technology, adopted in ceramic production, by mixing components, synthesis, intermediate grinding-mixing, the design of blanks of the desired type and sintering them at 13201350 ° C. The reality and optimality of the claimed ratio of ingredients is confirmed by the following examples given by the minimum, maximum and average value, wt .: Example 1. To obtain 1 kg of material containing: TAT O26.5 BaNbjLO 0.2 CaTiOg70.5 MgO0.3 SlOi2 , 0 LaAgOs -0.5 proceed as follows. Barium carbonate, titanium dioxide, niobium pentoxide, magnesium oxide and silicon are weighed, as well as calcium titanate spectra based on: VASO 1225.1 Then they are loaded into a vibrating mill with the ratio of balls and material (b-): and mixed for one

hours, after which the mixture is calcined with IZOO C with a one-hour exposure. The resulting product is milled and mixed with the finished spec. Of lanthanum aluminate in the above ratio (5 g) during the same time on a vibrating mill.

Samples are made according to. GOST StSS-yS and their electrical parameters are measured.

This composition has a dielectric constant value l} 6В170, tgif (2-3) .1СГ4, ТКЕ - (3860) М0, 9 V 3-10 Ohm cm.

Composition of material:

Example 2,

30.0

BaTiOii

0.5

67.0

CaTiO,

: 1.0

Hgo

0.6

Si02.

LaA & Oj

0.9. set out in the method, measure 1.

This composition has a dielectric constant of 183 19P, tgrf (| -5) 10-, TKE), f V / 3-10 Ohm-s

3. Composition material:

Example. 28.0

0.5

69.0

Cet ue 0.6

MDO 1.2

SiOa 0.7

LaAeOi

also obtained by the above method. This composition has a dielectric constant value / v 17 L79, tgJ-., TKE - (0-410)

10 degrees, fv / 1, Omgsm. In all cases, the values of the tangent of dielectric loss angle at temperatures up to did not exceed 8–10, and the insulation resistance did not decrease below 10.

As can be seen from the above data, the pv of the proposed thermostable material 0 is higher than that of the known material while maintaining high values of the dielectric constant and low tan (f.

A higher value of v, while maintaining high values and a greater stability of TKE values of +60 gU deg, allows capacitors to be obtained with thermostable TKE groups of a tile class with a larger specific capacity.

Claims (1)

HIGH FREQUENCY CONDENSER CERAMIC MATERIAL, containing BaT10 ₃ , CaTI0 ₃ , BaNt ^ Og, Si0 ₂ and MgO, characterized in that, in order to increase the specific volume resistance and stabilize the temperature coefficient of the dielectric permeability while maintaining high her meanings he additionally contains lives LaAEO ^ at the following relation research institutes May L: BaT10 ₃ 26.5-30.5 CaTiO ₃ 67.0-70.5 BaNb _x O ₆ 0.2-0.5 S ί 0 2 0.6-2.0 MgO 0.3-1.0 Laaco-s 0.5-0.9 e 9 ω a W * CHG 1033 * 182 2