JPH0785363B2 - Microwave dielectric ceramics - Google Patents
Microwave dielectric ceramicsInfo
- Publication number
- JPH0785363B2 JPH0785363B2 JP60154236A JP15423685A JPH0785363B2 JP H0785363 B2 JPH0785363 B2 JP H0785363B2 JP 60154236 A JP60154236 A JP 60154236A JP 15423685 A JP15423685 A JP 15423685A JP H0785363 B2 JPH0785363 B2 JP H0785363B2
- Authority
- JP
- Japan
- Prior art keywords
- mol
- temperature coefficient
- dielectric
- tio
- dielectric ceramics
- 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 - Lifetime
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Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、マイクロ波用の誘電体共振器やコンデンサに
用いられるマイクロ波用誘電体セラミツクスに関するも
のである。Description: TECHNICAL FIELD The present invention relates to a microwave dielectric ceramic used for a microwave dielectric resonator or a capacitor.
（従来の技術） マイクロ波用の誘電体共振器等では、用いる誘電体セラ
ミツクス組成物として、その比誘電率（εｒ）及び無負
荷Ｑ（Qu）が大きく、共振周波数の温度係数（ηｆ）と
しては、０を中心として正又は負の任意のηｆが得られ
ることが必要とされている。(Prior Art) In a dielectric resonator for microwaves or the like, the dielectric ceramic composition used has a large relative permittivity (ε r ) and no load Q (Qu), and a temperature coefficient (ηf) of the resonance frequency. Is required to obtain any positive or negative ηf centered on 0.
従来、かかる誘電体セラミツクス組成物としては、BaO
−TiO2系、ZrO2−SnO2−TiO2系、あるいは、MgO−TiO2
−CaO系等のセラミツクス組成物が使用されていた。Conventionally, as such a dielectric ceramic composition, BaO has been used.
-TiO 2 system, ZrO 2 -SnO 2 -TiO 2 system, or, MgO-TiO 2
-Ceramics compositions such as CaO have been used.
（発明が解決しようとする問題点） しかし、これらのセラミツクスの用いて誘電体共振器や
コンデンサを製造した場合、その温度係数（ηｆ）が０
（ppm/℃）付近では、その比誘電率（εｒ）が20〜40と
小さく、その結果これらの材料を用いた誘電体共振器等
の小形化が不可能であるという欠点があった。(Problems to be Solved by the Invention) However, when a dielectric resonator or a capacitor is manufactured using these ceramics, the temperature coefficient (ηf) thereof is 0.
In the vicinity of (ppm / ° C.), the relative dielectric constant (ε r ) is as small as 20 to 40, and as a result, there is a drawback that it is impossible to miniaturize a dielectric resonator or the like using these materials.
本発明は、以上の欠点を改善するためになされたもので
あり、比誘電率（εｒ）と無負荷Ｑ（Qu）が大きく、ま
た共振周波数の温度係数（ηｆ）が安定した値を有し、
かつ用途に応じてこの温度係数（ηｆ）を広く変化させ
うるマイクロ波用誘電体セラミツクスを提供することを
目的とする。The present invention has been made to improve the above drawbacks, and has a large relative permittivity (ε r ) and no load Q (Qu), and a stable temperature coefficient (ηf) of the resonance frequency. Then
Moreover, it is an object of the present invention to provide a dielectric ceramic for microwaves that can widely change the temperature coefficient (ηf) according to the application.
（問題点を解決するための手段） 本発明では、酸化バリウム（BaO）;13.2〜20.2モル％、
二酸化チタン（TiO2）;55.1〜77.1モル％、酸化サマリ
ウム（Sm2O3）3.5〜15モル％及び酸化セリウム（Ce
O2）;1.5〜15モル％の範囲にある主成分に対し、酸化ア
ルミニウム（Al2O3）を５重量％以下（ただし０重量％
は除く）添加したマイクロ波用誘電体セラミツクスとす
る。(Means for Solving Problems) In the present invention, barium oxide (BaO); 13.2 to 20.2 mol%,
Titanium dioxide (TiO 2 ); 55.1 to 77.1 mol%, samarium oxide (Sm 2 O 3 ) 3.5 to 15 mol% and cerium oxide (Ce
O 2 ); 5 wt% or less of aluminum oxide (Al 2 O 3 ) relative to the main component in the range of 1.5 to 15 mol% (however, 0 wt%
Except for) The dielectric ceramic for microwave is added.
（作 用） このような誘電体セラミツクスによれば、比誘電率（ε
ｒ）と無負荷Ｑ（Qu）が大きく、また共振周波数の温度
係数（ηｆ）が安定した値を有し、さらにAl2O3量のみ
の変化で、この温度係数（ηｆ）を広く変化させうる。(Operation) According to such a dielectric ceramic, the relative permittivity (ε
r ) and the no-load Q (Qu) are large, and the temperature coefficient (ηf) of the resonance frequency has a stable value. Furthermore, the temperature coefficient (ηf) can be widely changed by changing only the amount of Al 2 O 3. sell.
（実施例） 以下、この発明を具体的な実施例を示しつつ詳細に説明
する。出発原料として化学的に高純度のBaCO3,TiO2,Sm2
O3,CeO2及びAl2O3を用い、これらを表１及び表２に示す
組成比率にて混合し、空気中において、1060℃の温度で
２時間仮焼した。そして、得られた仮焼物をポットミル
で純水とともに湿式粉砕し、脱水乾燥後バインダを添加
し造粒し32メッシユのふるいを通して分級した。この造
粒粉体を、金型と油圧プレスを用いて成形圧力１〜3ton
/cm2で直径16mm,厚さ約9mmの円板状の成形体とした。そ
して、この成形体を高純度のアルミナ匣に入れ、1230〜
1450℃の温度で24時間保持し焼成し誘電体セラミツクス
を得た。この、得られた誘電体セラミツクスについて、
ハツキ・コールマン法により比誘電率（εｒ）と無負荷
Ｑ（Qu）を測定した。又、共振周波数の温度係数（η
ｆ）を、下記（１）式に従って、20℃に於ける共振周波
数を基準にして、−40℃〜80℃の温度範囲に於ける値か
ら求めた。これらの結果を表２に示す。ここで、※を付
したものは、この発明の範囲外の比較例を示し、それ以
外が本発明の実施例である。なお、これらの測定におけ
る共振周波数は３〜7GHzであった。(Examples) Hereinafter, the present invention will be described in detail with reference to specific examples. Chemically pure BaCO 3 , TiO 2 and Sm 2 as starting materials
Using O 3 , CeO 2 and Al 2 O 3 , these were mixed at the composition ratios shown in Tables 1 and 2 and calcined in air at a temperature of 1060 ° C. for 2 hours. Then, the obtained calcined product was wet-milled with pure water in a pot mill, dehydrated and dried, added with a binder, granulated, and classified through a 32 mesh sieve. This granulated powder is molded with a mold and hydraulic press at a molding pressure of 1 to 3 tons.
A disk-shaped molded body having a diameter of 16 mm and a thickness of about 9 mm at / cm 2 . Then, put this molded body in a high-purity alumina box, 1230 ~
The dielectric ceramics were obtained by holding at a temperature of 1450 ° C for 24 hours and firing. Regarding the obtained dielectric ceramics,
The dielectric constant (ε r ) and unloaded Q (Qu) were measured by the Hatsuki-Coleman method. In addition, the temperature coefficient of resonance frequency (η
f) was obtained from the value in the temperature range of −40 ° C. to 80 ° C. based on the resonance frequency at 20 ° C. according to the following formula (1). The results are shown in Table 2. Here, those marked with * indicate comparative examples outside the scope of the present invention, and the other examples are examples of the present invention. The resonance frequency in these measurements was 3 to 7 GHz.
但し、ｆ（20）:20℃に於ける共振周波数 ｆ（−40）：−40℃に於ける共振周波数 ｆ（80）:80℃に於ける共振周波数 ΔT:温度差ここでは80−（−40）＝120℃ 上表の結果より、主成分の範囲を限定した理由は、BaO
・（TiO2）×が70モル％未満、Sm2O3が3.5モル％未満、
あるいは、CeO2が15モル％を超えると、温度係数が大き
くなり誘電率も40以下と小さくなる等の問題が認められ
るからである。また、BaO・（TiO2）×が95モル％を超
えると、やはり誘電率が小さくなる。 However, f (20): Resonance frequency at 20 ° C f (-40): Resonance frequency at -40 ° C f (80): Resonance frequency at 80 ° C ΔT: Temperature difference 80-(- 40) = 120 ° C From the results in the above table, the reason for limiting the range of main components is BaO.
· (TiO 2) × less than 70 mol%, Sm 2 O 3 is less than 3.5 mol%,
Alternatively, when CeO 2 exceeds 15 mol%, there is a problem that the temperature coefficient increases and the dielectric constant decreases to 40 or less. Further, when BaO · (TiO 2 ) × exceeds 95 mol%, the dielectric constant also becomes small.
さらに、Sm2O3が15モル％を超え、あるいはCeO2が1.5モ
ル％未満では、温度係数が大きくなり不適当である。Further, if Sm 2 O 3 exceeds 15 mol% or CeO 2 is less than 1.5 mol%, the temperature coefficient becomes large, which is not suitable.
また、副成分Al2O3の添加量については、添加量の増加
とともに無負荷Ｑ（Qu）を大きくすることができるとと
もに、温度係数を変えることができる。しかし、５重量
％を超えると、無負荷Ｑが著しく小さくなるとともに温
度係数も大きくなり、不適当であり、本発明の範囲から
除かれる。Regarding the additive amount of the auxiliary component Al 2 O 3 , the unloaded Q (Qu) can be increased and the temperature coefficient can be changed as the additive amount is increased. However, when it exceeds 5% by weight, the no-load Q is remarkably reduced and the temperature coefficient is also increased, which is unsuitable and is excluded from the scope of the present invention.
（発明の効果） 以上詳細に説明したように、本発明のマイクロ波用誘電
体セラミツクスによれば、マイクロ波領域においてその
比誘電率（εｒ）及び無負荷Ｑ（Qu）が大きく、また共
振周波数の温度係数（ηｆ）が安定した値を有し、さら
にAl2O3量のみの変化で温度係数（ηｆ）を広く変化さ
せることができるので、マイクロ波用誘電体共振器、あ
るいは、温度補償用コンデンサ等の誘電体セラミツクス
として非常に好適に利用することができ、その工業的価
値は非常に高い。(Effect of the Invention) As described in detail above, according to the dielectric ceramics for microwaves of the present invention, the relative permittivity (ε r ) and the unloaded Q (Qu) are large in the microwave region, and the resonance The temperature coefficient of frequency (ηf) has a stable value, and the temperature coefficient (ηf) can be widely changed only by changing the amount of Al 2 O 3, so that the dielectric resonator for microwaves or the temperature It can be used very suitably as a dielectric ceramic such as a compensation capacitor, and its industrial value is very high.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 中山 松江 東京都港区虎ノ門１丁目７番12号 沖電気 工業株式会社内 (56)参考文献 特開 昭59−230207（ＪＰ，Ａ) 特開 昭58−185482（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Matsue 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (56) Reference JP-A-59-230207 (JP, A) JP-A-SHO 58-185482 (JP, A)
Claims (1)
2）、酸化サマリウム（Sm2O3）、酸化セリウム（CeO2）
および酸化アルミニウム（Al2O3）からなる誘電体セラ
ミックスで、 その主成分が、BaO;13.2〜20.2モル％、TiO2:55.1〜77.
1モル％、Sm2O3;3.5〜15モル％、CeO2;1.5〜15モル％の
範囲にあり、 この主成分に対して、Al2O3が５重量％以下（ただし、
０重量％を除く）添加含有されていることを特徴とする
マイクロ波用誘電体セラミックス。1. Barium oxide (BaO), titanium dioxide (TiO 2)
2 ), samarium oxide (Sm 2 O 3 ), cerium oxide (CeO 2 )
And a dielectric ceramic composed of aluminum oxide (Al 2 O 3 ), the main components of which are BaO; 13.2 to 20.2 mol%, TiO 2 : 55.1 to 77.
1 mol%, Sm 2 O 3 ; 3.5 to 15 mol%, CeO 2 ; 1.5 to 15 mol%, and Al 2 O 3 is 5 wt% or less (however,
Dielectric ceramics for microwaves, characterized in that they are added and contained (except 0% by weight).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60154236A JPH0785363B2 (en) | 1985-07-15 | 1985-07-15 | Microwave dielectric ceramics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60154236A JPH0785363B2 (en) | 1985-07-15 | 1985-07-15 | Microwave dielectric ceramics |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6217907A JPS6217907A (en) | 1987-01-26 |
| JPH0785363B2 true JPH0785363B2 (en) | 1995-09-13 |
Family
ID=15579817
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60154236A Expired - Lifetime JPH0785363B2 (en) | 1985-07-15 | 1985-07-15 | Microwave dielectric ceramics |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0785363B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2542237B2 (en) * | 1987-08-21 | 1996-10-09 | 株式会社住友金属エレクトロデバイス | Dielectric porcelain composition |
| JPH02112410U (en) * | 1989-02-28 | 1990-09-07 | ||
| ATE515486T1 (en) | 2004-10-26 | 2011-07-15 | Murata Manufacturing Co | CERAMIC MATERIAL COMPOSITION, CERAMIC SUBSTRATE AND IRREVERSIBLE CIRCUIT ELEMENT |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58185482A (en) * | 1982-04-23 | 1983-10-29 | 松下電器産業株式会社 | Dielectric ceramic composition |
| JPS59230207A (en) * | 1983-05-09 | 1984-12-24 | 沖電気工業株式会社 | Microwave dielectric ceramics |
-
1985
- 1985-07-15 JP JP60154236A patent/JPH0785363B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6217907A (en) | 1987-01-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |