JPS62252007A - Microwave dielectric porcelain compound - 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 dielectric ceramic composition for use in microwaves, and more particularly to a dielectric ceramic material suitable for use as a material for high-frequency circuits that handle microwaves.

(Prior art) As a -C type microwave dielectric material, B a
O-T i O2 system, A1. Off system, M g T i
O3.Ca Ti O3 type materials are known.

Among these dielectric materials for microwaves, the dielectric constant is large (
Bad-T
Many iOx types are used.

BaO-Tlo, based dielectric ceramic materials are conventionally BaO (
Or, BaC03) and Tie are used as starting materials, weighed to give a predetermined final composition, and manufactured through known means such as calcination, pulverization, granulation, compression molding, and sintering.

[Problem that the invention seeks to solve]

However, Ba
When a Q-TiO□-based dielectric ceramic material is manufactured, unreacted BaO and/or TiOx remain in the sintered body, and furthermore, the sintered body is easily reduced, so that the dielectric of the sintered body deteriorates. The fire will grow larger.

Microwave dielectric materials are required to have a high dielectric constant, low dielectric loss, and a low temperature coefficient at the resonant frequency for cavity resonators with high-frequency circuits. Dielectric ceramic materials are particularly required to have low dielectric loss.

The purpose of the present invention is to solve the problems of the prior art described above,
The object of the present invention is to provide a BaO-Tie-based microwave dielectric ceramic composition that can reduce dielectric loss while maintaining properties such as dielectric constant.

[Means for solving problems]

The above object is achieved by a microwave dielectric ceramic composition whose general formula is BaO-xTiox (4≦X≦4.6) using 3aTiOs and Ti1t as starting materials.

In the present invention, BaTi03 and T108 are each given a starting value of 1. BaO (or BaCO5 and Ti
If BaO-x T is used as the starting material, then BaO-x T
Even if the maximum #% composition is composed of iOz (4≦X≦4.6), it is not possible to obtain a dielectric material with small dielectric resistance.

The dielectric material of the present invention includes 13aTio* and T i Oz
and were weighed so that the final composition was BaO-xTio, <4≦x≦4°, and after mixing, heated at 900 to 1100°C.
It is calcined at a temperature of 2 to 5 hours. Then crush the calcined material,
After granulation, the dielectric composition according to the present invention is obtained by compression molding at a pressure of 300 to 2000 kg/- and firing at a temperature of 1150 to 1400° C. for about 2 to 15 hours.

In the present invention, in the general formula of BaO-XTiOz, X is 4 or more and 4.6 or less. When X is less than 4, the dielectric constant is small and the dielectric loss is large; on the other hand, when X is 4.6
If it exceeds , the temperature coefficient of dielectric constant becomes large.

〔Example〕

Examples 1 to 4) BaTi0 prepared in advance as a raw material
．． .

Powder and T+Q! Using powder, B a T i 0
3 powder and TiOz, the final composition is BaO-xTio, (
zx4.0.4.4.4.5.4.6) Then, the weighed materials were wet mixed, filtered, and then calcined for 4 hours at a temperature of 100°C.

6) After further crushing and granulating the calcined material, 1000k
After compression molding at a pressure of g/aj, 1180-1350℃
It was baked at a temperature of 10 hours. The dielectric constant (ε
r) and dielectric loss (tan δ) using the dielectric resonator method.
Measured at 0H.

Conventional examples 1 to 4 As a conventional example, 13a CO* and Tie are used as starting materials.

After weighing so that the final composition is the same as above,
The dielectric constant (εr) and dielectric loss (Lan δ) of the sample obtained by the same method as above were measured by the dielectric resonator method.

The test results of the example and the conventional example are shown in Tables 1 and 2, respectively.

From Table 1 and Table 2, it can be seen that the ceramic composition of this example has almost no difference in dielectric constant (sr) compared to the conventional ceramic composition, but the dielectric loss ( It can be seen that the material has a small value of tan δ) and is effective as a dielectric material for microwaves.

〔Effect of the invention〕

Claims (1)

[Claims] A microwave dielectric material comprising a composition represented by the general formula BaO_-_xTiO_2 (4≦x≦4.6) using BaTiO_3 and TiO_2 as starting materials, respectively. Porcelain composition.