JPS6093704A - Dielectric porcelain composition - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to dielectric ceramic compositions, particularly barium oxide (Ba
d), thorium oxide (Na20), niobium oxide (
In recent years, microwaves and millimeter waves (hereinafter collectively referred to as microwaves) with wavelengths of several centinole or less have been developed. ) handling 11':,'
With the advancement of frequency circuit technology, efforts are being made to make these circuits more compact.Up until now, cavity resonators, antennas, etc. have been used in these high frequency circuits, but these Its size is comparable to the wavelength of microwaves, which has been an obstacle to miniaturization. To solve this problem, methods have been taken to shorten the wavelength itself by using dielectric ceramics with a high dielectric constant. TiO2-based sandpaper is often used as a sandpaper suitable for such uses, such as T102-ZrO2-S.
n 02 system, CaTiO3-MgTiO3-I, a2
05-2Ti02 series, recently Ba (ZnHTaH)
Dielectric ceramics such as 05-Ba (Zn%Nb thermal) 05 series are known. However, when a dielectric resonance system is made with these monthly rates, the relative dielectric constant (εr) is as low as about 30. If a material with A = 30 is used, it will be a small unino l- with a diameter of 5 emu and a thickness of about 2.21 Jm, but if the frequency is lowered and it is used in the UHF band of about 2 GHz, it will be the same.

When the material is =30, the diameter is 30.7M, and the diameter is C/12.
・The shape becomes significantly larger, approximately 3M. If the dielectric constant (εr) of the material used here can be increased to about 80, its size will be 18-87m+1 in diameter and 7.5/l7 in thickness.
Although the size can be reduced to about 11, it was not possible to increase R to Aj with conventional materials.

OBJECTS OF THE INVENTION The present invention has been made to overcome the above-mentioned drawbacks.
The temperature coefficient of the resonant frequency has a stable value,
The overall purpose is to provide a dielectric magnet whose temperature coefficient can be varied widely depending on the application.

The inventors have conducted various tests8 on the materials that reveal the key point 94 mentioned above.
=J result, Ba (N2L3.Nb%), -x
TiXO.

In the composition represented by 0x≦0.6 (mole fraction)
It has been discovered that the composition described in the section can be made into an excellent high-frequency dielectric porcelain.Explanation of an example Starting materials include chemically high-purity BaC03, Na2c.
03.

Nb2O5 and TiO2f were weighed and wet-mixed with ethyl alcohol in a polyethylene ball mill equipped with an agate ball. The mixture was removed from the ball mill, dried, and then calcined in air at a temperature of 1100'C for 2 hours. The calcined product was wet powdered for 6 JIL with ethyl alcohol in the aforementioned ball mill. Over-dry the crushed slurry/Add a binder to the powder and add a polyvinyl alcohol solution with a concentration of 6% to a total of 8% to 17%, and make the flow equal to 11%/After this, The well-aligned powder was passed through a 32mm/2 sieve and molded using a mold and hydraulic press sound at a pressure of 800KVtlj to a diameter of 20mm and a size of about 1mm.
It was molded into a m1JI disc. The whole molded product is placed in a pot made of pure alumina and fired by keeping it in air at a temperature within the range of 1200 to 1600°C for 2 hours depending on the composition. magnetic t to k itr
Takko's magnetic A1 "; element is used to create a dielectric"
') From 1llll constant by the method ((h~, frequency and;
I read the load Q (Qu) and the dielectric constant (εr). The temperature dependence of the resonant frequency is from -30'C to 70'
The temperature coefficient (τf) was measured in the range of C (oscillation frequency was 2 to 4 GHz).The experimental results are shown in the table. 1j
-1 is a ratio 1 bite example outside the scope of the present invention, and the other samples are examples within the scope of the present invention.

Below, extra white * indicates comparative examples outside the scope of the present invention. ** indicates the value at frequency 1MH2.

As is clear from the table, the electromagnetic material within the scope of the present invention can increase the dielectric constant in the microwave frequency band, exhibit large no-load Q values, and maintain stable temperature. Shows all characteristics. Therefore, the dielectric ceramic of the present invention is useful for fully stabilizing the oscillation d, y and the temperature dependence of the resonator, and is particularly suitable for use in the UHF band due to its large dielectric constant, and is compact and has commercial performance. can make electronic circuit parts.

To fully explain the reason for limiting the composition range of the present invention, Ti,
07 Porcelain whose composition exceeds 0.5 mol lIJ ratio; ・：improvement of Sito 1 relative dielectric strength + JQ 4 2 (
Although ZI can be seen, the resonance in the micro frequency band becomes weak and the no-load Q becomes low -1 or high, so it is excluded from the scope of non-invention.

However, since the x-o magnetic a: < id has a small dielectric constant and cannot be solved according to 1-1 of the present invention, it is excluded from the scope of the present invention.

Effects of the Invention Dielectric porcelain 1 of the present invention; composition Q, 12; dielectric '=t; is attractive in the microwave frequency band; 1. ! ! '
Since the temperature coefficient of L load, Q load, and resonance frequency exhibits stable values, it is useful for completely stabilizing the temperature dependence of oscillators, resonators, etc. In addition, due to its large dielectric constant, it is suitable for use in the UHF band, and it is possible to create small electronic circuit components with a performance of 11".Furthermore, by changing the composition of the interest rate, the desired τf can be selected. Therefore, when a dielectric resonator is assembled, a temperature compensation function can be provided to eliminate the influence of surrounding metal plates on temperature characteristics.Furthermore, the present invention is applicable not only to dielectric resonators but also to It can also be used as a useful material for microwave plates and dielectric adjustment rods, and has great industrial utility.

Claims (1)

[Claims] It consists of barium oxide, sodium oxide, niobium oxide, and titanium oxide, and its composition formula is total Ba (Na and Nl), -
An electromagnetic paraboloid having a mole fraction of O(X≦0.5), expressed as Tiz03.