JPS61237305A - Dielectric ceramic composition for high frequency - 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 a high frequency dielectric ceramic composition having a high dielectric constant and a high Q value in a high frequency region such as microwaves and millimeter waves.

[Conventional technology]

In high frequency regions such as microwaves and millimeter waves, dielectric ceramics are widely used for dielectric resonators, dielectric substrates for MIC, and the like.

Conventionally, as this type of dielectric ceramic, for example, Zr0z
Snug-TiO2-based materials, Ba0-TiOz-based materials, (Ba, Sr) (Zr, Ti)02-based materials,
B'a (Zn, Ta)O, and other materials are known.

However, these various materials all have a frequency of 10G.
Dielectric constant (ε) at Hz is 20-40°Q is 3000
~6000, temperature coefficient (τf) of resonance frequency is Oppm
It is also known that it is an excellent material with properties near /''C.

[Problem that the invention seeks to solve]

However, recently, the high frequency range used has become even higher, and correspondingly, even higher dielectric constants and higher Q
Materials with value are required.

Therefore, an object of the present invention is to provide a high frequency dielectric ceramic composition that can meet this demand.

[Means for solving problems]

The high frequency dielectric ceramic composition of the present invention comprises BaO1Zr
It consists of O2, ZnO, NbzOs, and has the general formula Ba(Zr
, Zny Nb1l ) Ow , w=2 x+y
+TZ+1. In the composition represented by x+y+z=1,
X+ y+ 2 are each 0.01≦x≦0.35
．． 0.20≦y≦0.35.0.45≦z≦0.70
(However, x+y+z=1).

1 is a graph showing the ranges of x, y, and z in composition No. 1.

Here, the reason why x, y, and z in the above composition are each limited to the above ranges will be explained.

That is, the reason why X is set to 0.01≦x≦0.35 is because if X is less than 0.01 or exceeds 0.35, Q decreases. The reason why y is set to 0.20≦y≦0.35 is because if y is less than 0.20, sintering will be difficult.
This is because if it exceeds 35, Q will decrease. Furthermore, 2 is 0.
The reason for setting 45≦z≦0.70 is that if 2 is less than 0.45, Q will decrease, and if it exceeds 0.70, sintering will become difficult.
Or it is because Q decreases.

〔Example〕

Hereinafter, this invention will be explained in detail according to examples.

High purity BaCO3, Z r Oz, Z as raw materials
n 02 NbzOs was weighed so as to obtain porcelain having the composition ratio shown in Table 1, and this mixed raw material was put into a rubber-lined ball mill together with water and wet-mixed for 2 hours.

Next, this mixture was dehydrated and dried, and then calcined at 1200° C. for 2 hours, and the calcined product was put into a ball mill together with water and an organic binder and wet-pulverized for 2 hours.

Thereafter, the pulverized product was dried and granulated through a 50-mesh mesh, and the resulting powder was molded into a disk having dimensions of 10 mmφ x 5 mmt under a pressure of 2000 kg/cm.

Furthermore, this disk is 1500~b Porcelain samples were obtained by firing under conditions between 1 and 2.

The dielectric constant (ε) and Q at a frequency of 6 GHz were measured for the thus obtained ceramic sample using the dielectric resonance method, and the temperature at the resonant frequency was determined from the temperature change rate of the resonant frequency in the temperature range from 25°C to 85°C. The coefficient (τf) was calculated. The results are shown in Table 1.

Items marked with * in Table 1 are outside the scope of this invention, and all others are within the scope of this invention.

(The following is a margin) Table 1 ■ [ ■ Company In Table 1, the sample numbers are comparative examples and are excluded from the scope of this invention.

Samples 13.14.15 and 16 were Ba(Zr.

Zn, Nbg)Ow, w=2x+y+,z+l.

Any value of X+ y+ 2 in x+y+z=1 is outside the scope of the present invention, and sintering is difficult or the properties are degraded.

Within the scope of this invention, the dielectric constant (ε) is between 39 and
The dielectric constant is in the range of 41, which is higher than the dielectric constant of the conventional materials mentioned above (i.e., 20 to 40). Also, Q
It is in the range of 6000 to 13400, and the Q of conventional materials (
That is, it is a very high value compared to 3000 to 6000).

〔Effect of the invention〕

As described above, according to the present invention, it is possible to obtain a dielectric ceramic composition for high frequencies that has a high dielectric constant and a high Q value that has not been obtained conventionally.

The dielectric ceramic composition of the present invention having the above-mentioned characteristics can be used for applications such as dielectric resonators, dielectric adjustment rods, and dielectric substrates.

[Brief explanation of drawings]

The drawings show Ba (Zrx ZnyNbg) according to this invention.
Ow, w=2 x+y+Σz+l, x+y+z −1
It is a graph showing the range of x+ 3'+ 2 in the composition.

Claims (1)

[Claims] (1) Consists of BaO, ZrO_2, ZnO, Nb_2O_5, and has the general formula Ba(Zr_xZn_yNb_z)O_
In the composition represented by w, w=2x+y+5/2z+1, x+y+z=1, x, y, and z are each 0.01≦
x≦0.35, 0.20≦y≦0.35, 0.45≦z
A high frequency dielectric ceramic composition having a composition in the range of ≦0.70 (x+y+z=1).