JPS6021447B2 - Magnetic dielectric composition for temperature compensation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a porcelain dielectric composition for temperature compensation which has a high dielectric constant, a temperature coefficient of 4.0, and a small dielectric loss.

An object of the present invention is to obtain a porcelain dielectric composition for temperature compensation, which has a dielectric constant of 300 or more, a temperature coefficient of ±250 PM/°C or less, and has excellent adjacency. As a compensating ceramic dielectric composition, Ti02 and M in Ti02 are used.
A composition in which tZrQ of g0 and mother ○Ca○S is added is used.The above material has a small dielectric constant and a small temperature coefficient value.Therefore, it has a large dielectric constant. Moreover, a material with a small temperature coefficient was required.

For example, CaTi02 having the above composition has a dielectric constant of 160,
Temperature coefficient - 160 PM/.

0, and SrTiQ has a dielectric constant of 360 and a temperature coefficient of -450.
Although there is a method of improving the temperature coefficient by adding Bi203 or Bi203 and Ti02 simultaneously to these materials, a composition that fully satisfies the dielectric constant and temperature characteristics has not been obtained.

The present invention eliminates such drawbacks, CaTi〇3 is 60-9 hours.

So%, BaTi〇2 is 40-1 h. 0.1 to 2 parts of SrTi03 to 100 parts by weight of the basic composition consisting of
The present invention relates to a temperature-compensating porcelain transfer body composition containing up to 5 parts by weight. The present invention will be specifically described below with reference to Examples. Example Commercially available CaC02, BaC03, and SrC03 were each mixed with Ti03 in an equimolar ratio.
CaT
i03, port Ti03, and SrTj03 were created.

Next, these raw materials were blended to have the composition ratio shown in Table 1, wet mixed using a urethane-lined pot mill, water was evaporated, an aqueous solution of PVA was added as a binder, and after drying, the diameter Approximately 1 disc with 10 sides and 2 legs thick
~2/ Pressure molding is carried out using ground pressure, and the forming process is carried out under predetermined forming conditions.

A Pd-Ag paste was baked onto the obtained porcelain body to obtain a completed body, and the electrical properties were measured and the results shown in Table 2 were obtained. 1st
Table Dielectric Composition Table 2 Breaking Conditions and Electrical Properties The electrical properties above are measured values at a frequency of 1kHz, and the dielectric constant tau6 is the value at 20qo.
Further, since the change in dielectric constant due to temperature is not linear, the temperature coefficient shows the maximum value between 12 and 0 to 180 degrees Celsius.

Sample M. From the results of 11, 22, and 23, CaTi0
3 exceeds 9 plates o〆%, the specified yield rate cannot be obtained, and the sample area in the table. From the results of 1, 2, 16, 17, and 18, CaT
When i03 is less than 6.0%, the temperature characteristics deteriorate.

Moreover, as shown in Table 2, as SrTi03 is added,
As the dielectric constant improves, the temperature characteristics become flat, but if more than 3 parts by weight is added, the temperature characteristics shift to negative, and the temperature characteristics become negative.
Dish PM/℃ will be exceeded.

Further, if the amount is less than 0.1 part by weight, no significant addition effect is observed. Therefore, from the above, CaTi03 is limited to 60 to 9%, and Ti03 is limited to 40 to 1% by weight.Furthermore, with respect to the basic composition of 10% by weight, SrTjQ is 0.1 to 9% by weight.
Limited to 25 parts by weight.

Also, sample ship. From the results of Nos. 12 to 25, other oxides also have the function of increasing the silkiness, lowering tan6, and increasing mechanical strength, but in amounts exceeding 3 parts by weight per 100 parts by weight of the basic composition. On the contrary, if it is added, the oxidation property will deteriorate and the dielectric constant will decrease.

Claims (1)

[Claims] 1. 60 to 90 mol of CaTiO_3 as the main component
%, SrTiO_3 is 0.1 parts by weight for 100 parts by weight of the basic composition consisting of 40 to 10 mol% of BaTiO_3.
A porcelain dielectric composition for temperature compensation, characterized in that ~25 parts by weight is added. 2 60 to 90 mol of CaTiO_3 as the main component
%, SrTiO_3 is 0.1 parts by weight for 100 parts by weight of the basic composition consisting of 40 to 10 mol% of BaTiO_3.
Added ~25 parts by weight, and further added SiO_2, MnO_2, B
i_2O_3, Al_2O_3, Fe_2O_3, Ti
A porcelain dielectric composition for temperature compensation, characterized in that 0.1 to 3 parts by weight of one or a combination of two or more of O_2, SnO_2, CuO, C_0O, and NiO are added.