JPS6311310B2 - - Google Patents
Info
- Publication number
- JPS6311310B2 JPS6311310B2 JP54068136A JP6813679A JPS6311310B2 JP S6311310 B2 JPS6311310 B2 JP S6311310B2 JP 54068136 A JP54068136 A JP 54068136A JP 6813679 A JP6813679 A JP 6813679A JP S6311310 B2 JPS6311310 B2 JP S6311310B2
- Authority
- JP
- Japan
- Prior art keywords
- dielectric
- temperature
- composition
- zro
- dielectric constant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000000203 mixture Substances 0.000 claims description 10
- 229910010293 ceramic material Inorganic materials 0.000 claims description 4
- 229910052573 porcelain Inorganic materials 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 239000003985 ceramic capacitor Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Inorganic Insulating Materials (AREA)
Description
本発明は誘電体磁器材料、特にBaO、SrO、
MgO、Nb2O5、およびZrO2の成分で構成される
誘電体磁器材料に関するものであり、誘電率
（ε）と無不荷Ｑが大きく、かつ共振周波数の温
度安定度（τf）に優れたマイクロ波用誘電体共振
器を構成できる材料を提供しようとするものであ
る。
従来から、マイクロ波領域において、誘電体
は、マイクロ波回路のインピーダンス整合や、誘
電体共振器などに応用されてきている。近年、特
に、マイクロ波回路の集積化の技術が進歩するに
ともない、発振器の周波数の安定化などに、高誘
電率、低損失、低価格の誘電体磁器を使用して小
形化することが積極的に進められている。従来、
これらの誘電体材料としては、BaO−TiO2系磁
器、およびその一部を他の元素で置換した磁器、
さらには誘電率が負の温度変化をもつTiO2と正
の誘電率の温度変化をもつ誘電体磁器とを組合わ
せたものを使用する場合が多い。
しかし、これらは、誘電体損失が大きかつた
り、誘電率の温度変化のばらつきが大きかつた
り、共振周波数の安定度が大きすぎたりして、実
用上問題が多い。
出願人において、これらの欠点のない材料につ
いて、種々検討した結果、一般式xBaO・
yMgO・zNb2O5で表わされる組成において、0.5
≦ｘ≦0.75、0.1≦ｙ≦0.3、0.1≦ｚ≦0.3（ただし
ｘ＋ｙ＋ｚ＝１）の範囲内にある組成の磁器が、
優れた誘電体マイクロ波共振器になることを見出
した（特開昭51−110245号）。しかしながら、こ
れは共振周波数の温度安定度（τf）がかなり大き
くＱも低いものであり、その安定度およびＱを向
上させるための研究を進めた。本発明はその結果
にもとづくものである。
本発明にかかる誘電体共振器用材料は、BaO、
MgO、およびNb2O5さらにCaO、ZrO2とを加え
ることによつて、無負荷Ｑと誘電率を低下させる
ことなく、共振周波数の温度安定度（τf）を向上
させることができたものである。その特徴とする
ところは、（１−ｗ）（xBaO・yMgO・zNb2O5）
＋wCaO・ZrO2なる組成において、0.5≦ｘ≦
0.75、0.1≦ｙ≦0.3、0.1≦ｚ≦0.3、0.05≦ｗ≦
0.95の範囲内（ただしｘ＋ｙ＋ｚ＝１）にある組
成を有することにある。
以下、実施例にもとづいて、本発明を説明す
る。
まず、BaCO3、MgO、Nb2O5、CaCO3および
ZrO2の出発原料を各組成に応じて秤量し、めの
うボールを備え、かつゴム内張りしたボールミル
で純水とともに湿式混合した。この混合物を乾燥
させてから、空気中において1200℃で５時間仮焼
した後、前記ボールミルで湿式粉砕した。得られ
た粉砕泥しようをボールミルから取出して、乾燥
させた後、圧力700Kg／cm2で直径30mmの円板状に
成形し、それを空気中において所定の温度で２時
間焼成して、下表に示す組成の磁器を得た。それ
をマイクロ波用誘電体共振器に使用して、トラツ
プ法により共振周波数を測定し、この共振周波数
（ほぼ2GHz）と直径とから誘電率（ε）を、また
帯域反射法により無負荷Ｑ（Qu）を測定した。共
振周波数の温度安定度（τf）は、温度槽に各試料
を入れ、−30℃から＋70℃の温度変化におけるト
ラツプ周波数の変化を測定して求めた。その結果
を下表に示す。
The present invention relates to dielectric ceramic materials, especially BaO, SrO,
It concerns a dielectric ceramic material composed of MgO, Nb 2 O 5 and ZrO 2 components, which has a large dielectric constant (ε) and uncharged Q, and has a low temperature stability of the resonance frequency (τ f ). The aim is to provide a material that can construct an excellent dielectric resonator for microwaves. Conventionally, in the microwave region, dielectrics have been applied to impedance matching of microwave circuits, dielectric resonators, and the like. In recent years, especially as the integration technology of microwave circuits has progressed, there has been an active effort to use dielectric ceramics with high dielectric constant, low loss, and low cost to stabilize the frequency of oscillators and to miniaturize them. progress is being made. Conventionally,
These dielectric materials include BaO- TiO2 -based porcelain, porcelain in which some of it is replaced with other elements,
Furthermore, a combination of TiO 2 , which has a negative dielectric constant that changes with temperature, and dielectric ceramic, which has a positive dielectric constant that changes with temperature, is often used. However, these have many practical problems, such as large dielectric loss, large variations in temperature change in dielectric constant, and too high stability of resonance frequency. As a result of various studies conducted by the applicant regarding materials that do not have these drawbacks, the general formula xBaO・
In the composition represented by yMgO・zNb 2 O 5 , 0.5
Porcelain with a composition within the range of ≦x≦0.75, 0.1≦y≦0.3, 0.1≦z≦0.3 (however, x+y+z=1),
It was discovered that this material can be used as an excellent dielectric microwave resonator (Japanese Patent Application Laid-open No. 110245/1983). However, this has a considerably large temperature stability (τ f ) of the resonant frequency and a low Q, so we conducted research to improve the stability and Q. The present invention is based on that result. The dielectric resonator material according to the present invention includes BaO,
By adding MgO and Nb 2 O 5 as well as CaO and ZrO 2 , the temperature stability of the resonant frequency (τ f ) can be improved without reducing the no-load Q and dielectric constant. It is. Its characteristics are (1-w) (xBaO・yMgO・zNb 2 O 5 )
In the composition +wCaO・ZrO 2 , 0.5≦x≦
0.75, 0.1≦y≦0.3, 0.1≦z≦0.3, 0.05≦w≦
The composition is within the range of 0.95 (x+y+z=1). Hereinafter, the present invention will be explained based on Examples. First, BaCO 3 , MgO, Nb 2 O 5 , CaCO 3 and
Starting materials for ZrO 2 were weighed according to each composition and wet-mixed with pure water in a ball mill equipped with an agate ball and lined with rubber. This mixture was dried, calcined in air at 1200° C. for 5 hours, and then wet-pulverized in the ball mill. The obtained crushed slurry was taken out from the ball mill, dried, and then molded into a disc shape with a diameter of 30 mm at a pressure of 700 kg/ cm2 , which was then fired in air at a specified temperature for 2 hours to form the following table. A porcelain having the composition shown in was obtained. Using it in a dielectric resonator for microwaves, the resonant frequency was measured by the trap method, and the permittivity (ε) was determined from this resonant frequency (approximately 2 GHz) and the diameter, and the unloaded Q ( Qu) was measured. The temperature stability (τ f ) of the resonance frequency was determined by placing each sample in a temperature bath and measuring the change in trap frequency as the temperature changed from -30°C to +70°C. The results are shown in the table below.
【表】
ただし＊は比較例
表より明らかなように、本発明の誘電体磁器材
料は、マイクロ波領域において、無負荷Ｑが大き
く、誘電率が比較的大きく、さらに共振周波数の
温度安定度の改善された優れたものであることが
わかる。
本発明の範囲外の組成の試料６、７は、磁器へ
の焼結がよくなく、誘電体共振器として利用する
に十分な機械的強度をもつ磁器とならず、また試
料12はCaO・ZrO2添加の効果が明瞭でなく試料
13は誘電が小さくかつその温度係数が大きいので
本発明の範囲から除いた。
なお、本発明にかかる磁器は、低周波領域にお
いても誘電損失が小さく（Ｑは10000以上）、かつ
誘電率の温度変化が小さいので、磁器コンデンサ
用をしても優れた材料であり、その工業的価値の
大きいものである。[Table] However, * indicates a comparative example. As is clear from the table, the dielectric ceramic material of the present invention has a large no-load Q, a relatively large dielectric constant, and a low temperature stability of the resonant frequency in the microwave region. It can be seen that it is an improved and excellent product. Samples 6 and 7 with compositions outside the scope of the present invention did not sinter well into porcelain and did not have sufficient mechanical strength to be used as a dielectric resonator, and sample 12 had a CaO/ZrO 2 The effect of addition is not clear in the sample.
No. 13 was excluded from the scope of the present invention because of its small dielectric value and large temperature coefficient. Furthermore, the porcelain according to the present invention has a small dielectric loss even in the low frequency range (Q is 10,000 or more), and the change in dielectric constant with temperature is small, so it is an excellent material for use in ceramic capacitors, and is suitable for industrial use. It is of great value.
Claims (1)
zNb2O5〕＋wCaO・ZrO2で表わされる組成におい
て、0.5≦ｘ≦0.75、0.1≦ｙ≦0.3、0.1≦ｚ≦0.3、
0.05≦ｗ≦0.95の範囲（ただしｘ＋ｙ＋ｚ＝１）
にある組成であることを特徴とする誘電体磁器材
料。[Claims] 1 General formula (1-w) [xBaO・yMgO・
In the composition represented by zNb 2 O 5 ]+wCaO・ZrO 2 , 0.5≦x≦0.75, 0.1≦y≦0.3, 0.1≦z≦0.3,
Range of 0.05≦w≦0.95 (however, x+y+z=1)
A dielectric ceramic material characterized by having a composition as follows.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6813679A JPS55162476A (en) | 1979-05-30 | 1979-05-30 | Dielectric ceramic material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6813679A JPS55162476A (en) | 1979-05-30 | 1979-05-30 | Dielectric ceramic material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55162476A JPS55162476A (en) | 1980-12-17 |
| JPS6311310B2 true JPS6311310B2 (en) | 1988-03-14 |
Family
ID=13365024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6813679A Granted JPS55162476A (en) | 1979-05-30 | 1979-05-30 | Dielectric ceramic material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55162476A (en) |
-
1979
- 1979-05-30 JP JP6813679A patent/JPS55162476A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55162476A (en) | 1980-12-17 |
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