JP2554478B2 - Microwave dielectric porcelain composition - Google Patents
Microwave dielectric porcelain compositionInfo
- Publication number
- JP2554478B2 JP2554478B2 JP61262111A JP26211186A JP2554478B2 JP 2554478 B2 JP2554478 B2 JP 2554478B2 JP 61262111 A JP61262111 A JP 61262111A JP 26211186 A JP26211186 A JP 26211186A JP 2554478 B2 JP2554478 B2 JP 2554478B2
- Authority
- JP
- Japan
- Prior art keywords
- mol
- dielectric
- tio
- composition
- bao
- 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 - Fee Related
Links
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- Compositions Of Oxide Ceramics (AREA)
- Inorganic Insulating Materials (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、マイクロ波帯において誘電体共振器等に用
いられる磁器組成物に関し、更に詳しくは、BaO−TiO2
−Nd2O3系の誘電体磁器組成物に関するものである。TECHNICAL FIELD The present invention relates to a porcelain composition used for a dielectric resonator or the like in a microwave band, and more specifically, BaO—TiO 2
The present invention relates to a -Nd 2 O 3 -based dielectric ceramic composition.
［従来の技術］ 自動車無線や衛星通信のようなマイクロ波を利用した
通信の分野においては、フィルタ等として誘電体磁器が
多用されていることは周知の通りである。このような分
野で使用される誘電体磁器の特性としては、装置を小型
化するため誘電率が高いこと、損失が低いこと、および
安定性に優れていることを望まれる。[Prior Art] It is well known that dielectric ceramics are frequently used as filters and the like in the field of communication using microwaves such as automobile radio and satellite communication. As characteristics of the dielectric ceramics used in such fields, it is desirable that the dielectric constant is high, the loss is low, and the stability is excellent in order to miniaturize the device.
マイクロ波用誘電体磁器組成物としては、BaO−TiO2
−希土類系が従来公知であり、例えばBaO−TiO2−Nd2O3
系あるいはBaO−TiO2−Sm2O3系などの三成分系組成物に
ついて報告されている。As a dielectric ceramic composition for microwave, BaO-TiO 2
- earth systems are known conventionally, for example BaO-TiO 2 -Nd 2 O 3
It has been reported for the system or ternary compositions, such as BaO-TiO 2 -Sm 2 O 3 system.
［発明が解決しようとする問題点］ しかしこれら公知の組成は、マイクロ波用誘電体材料
としては必ずしも十分満足のできるものではない。例え
ば従来のBaO−TiO2−Nd2O3系の磁器組成物は、共振周波
数温度係数τｆを小さくできるものの、誘電率が低く
（60程度）、誘電体のＱも低い。[Problems to be Solved by the Invention] However, these known compositions are not always sufficiently satisfactory as a dielectric material for microwaves. For example, a conventional BaO—TiO 2 —Nd 2 O 3 based porcelain composition can have a low resonance frequency temperature coefficient τf, but has a low dielectric constant (about 60) and a low dielectric constant Q.
本発明者等は先に、上記三元系磁器組成物に適量のBi
2O3を添加することによって誘電特性を改善できること
を見出した（特願昭61−26518号）。The present inventors previously found that an appropriate amount of Bi in the ternary porcelain composition was
It has been found that the addition of 2 O 3 can improve the dielectric properties (Japanese Patent Application No. 61-26518).
本発明の目的は、上記の技術を更に発展させ、誘電率
が高く温度特性が良好で、且つ損失が小さいマイクロ波
用誘電体磁器組成物を供給することにある。An object of the present invention is to further develop the above technique and to provide a dielectric ceramic composition for microwaves, which has a high dielectric constant, a good temperature characteristic, and a small loss.
［問題点を解決するための手段］ 上記のような目的を達成することのできる本発明は、
BaO−TiO2−Nd2O3系材料を主成分とし、それに副成分と
して適量のBi2O3とAl2O3を添加したマイクロ波用誘電体
磁器組成物である。[Means for Solving Problems] The present invention capable of achieving the above-mentioned object is
The BaO-TiO 2 -Nd 2 O 3 based material as a main component, it is a microwave dielectric ceramic composition prepared by adding an appropriate amount of Bi 2 O 3 and for Al 2 O 3 subcomponent.
本発明者等はBaO−TiO2−Nd2O3系の組成物について種
々試作実験を繰り返した結果、Bi2O3と共にAl2Oを適量
添加することによって焼結性が増し、誘電率が高く且つ
温度特性が良好で低損失のモイクロ波用誘電体磁器組成
物が得られることを知得し、本発明を完成させるに至っ
たものである。The present inventors have result of repeating various trial experiments on BaO-TiO 2 -Nd 2 O 3 based compositions, sinterability increases by adding an appropriate amount of Al 2 O with Bi 2 O 3, dielectric constant The inventors have found that a dielectric ceramic composition for a moist wave having high temperature characteristics, good temperature characteristics, and low loss can be obtained, and the present invention has been completed.
本発明において主成分となるBaO−TiO2−Nd2O3系の組
成は、BaOが10〜16モル％、TiO2が67.5〜72モル％、Nd2
O3が15〜18モル％の範囲であり、そのような主成分に対
して副成分として５〜11重量％のBi2O3と0.3〜1.0重量
％のAl2O3が添加される。各組成の上限ならびに下限を
示す数値は、それらの値を含むものである。The composition of BaO-TiO 2 -Nd 2 O 3 system comprising a main component in the present invention, BaO is 10 to 16 mol%, TiO 2 is from 67.5 to 72 mol%, Nd 2
O 3 is in the range of 15 to 18 mol%, and 5 to 11 wt% of Bi 2 O 3 and 0.3 to 1.0 wt% of Al 2 O 3 are added as secondary components to such a main component. The numerical values indicating the upper and lower limits of each composition include those values.
ここでBaOを10〜16モル％としたのは、10モル％未満
では誘電率が小さくなり、逆に16モル％を超えると温度
係数が大きくなるからである。またTiO2を67.5〜72モル
％としてのは、67.5モル％未満では焼結性が悪くなる
し、72モル％を超えると温度係数が大きくなるからであ
る。更にNd2O3を15〜18モル％としたのは、15モル％未
満では温度係数が大きくなり、18モル％を超えると誘電
率が小さくなるからである。The reason why BaO is set to 10 to 16 mol% is that the dielectric constant becomes small when it is less than 10 mol% and the temperature coefficient becomes large when it exceeds 16 mol%. Further, TiO 2 is set to 67.5 to 72 mol% because if it is less than 67.5 mol%, the sinterability deteriorates, and if it exceeds 72 mol%, the temperature coefficient becomes large. Furthermore, the reason why Nd 2 O 3 is made 15 to 18 mol% is that the temperature coefficient becomes large when it is less than 15 mol%, and the dielectric constant becomes small when it exceeds 18 mol%.
そして副成分の一つであるBi2O3を５〜11重量％とし
たのは、５重量％未満では温度係数の改善の効果が少な
く、また11重量％を超えると焼結性が不十分となり誘電
体のＱが著しく低下してしまうからである。またAl2O3
を0.3〜1.0重量％としたのは、0.3重量％未満ではＱ並
びに温度係数の改善の効果が少なく、1.0重量％を超え
ると誘電率が小さくＱが減少するからである。And Bi 2 O 3 which is one of the auxiliary components is set to 5 to 11% by weight because the effect of improving the temperature coefficient is small when the content is less than 5% by weight, and the sinterability is insufficient when the content exceeds 11% by weight. This is because the Q of the dielectric material is significantly reduced. Also Al 2 O 3
The content of 0.3 to 1.0% by weight is because if it is less than 0.3% by weight, the effect of improving Q and temperature coefficient is small, and if it exceeds 1.0% by weight, the dielectric constant is small and Q is decreased.
［作用］ 上記のようにBaO−TiO2−Nd2O3系の主成分に対してBi
2O3とAl2O3を適量添加すると、誘電率が高く且つ温度特
性が良好で低損失のマイクロ波用誘電体磁器組成物が得
られる。特に主成分の比率を前記の範囲内で適当に変え
られることによって誘電率が64から92程度までの間で任
意に選定することができる。誘電率が高くなれば小型化
することができるけれども加工精度が誘電体共振器の特
性に微妙に影響を与えるから、上記のように誘電率をあ
る高い範囲内で適当に選択できることは誘電体共振器を
製作する上において極めて好ましいことである。[Operation] Bi respect to the main component of the BaO-TiO 2 -Nd 2 O 3 system as described above
When 2 O 3 and Al 2 O 3 are added in appropriate amounts, a dielectric ceramic composition for microwaves having a high dielectric constant, good temperature characteristics and low loss can be obtained. In particular, the dielectric constant can be arbitrarily selected from about 64 to 92 by appropriately changing the ratio of the main components within the above range. If the permittivity becomes higher, the size can be reduced, but the processing precision has a delicate influence on the characteristics of the dielectric resonator. Therefore, it is important to select the dielectric constant within a certain high range as described above. It is extremely preferable in manufacturing a container.
またBi2O3の添加量を変えることにより共振周波数の
温度係数τｆの所望の小さな値にすることができる。更
にAl2O3の添加によって安定な焼結体が得られ、温度係
数の微妙な調整など特性の改善ができる。Further, the temperature coefficient τf of the resonance frequency can be set to a desired small value by changing the addition amount of Bi 2 O 3 . Furthermore, by adding Al 2 O 3, a stable sintered body can be obtained, and characteristics such as delicate adjustment of the temperature coefficient can be improved.
［実施例］ BaCo3,TiO2,Nd2O3,Bi2O3およびAl2O3粉体を所定の組
成となるように湿式混合し、1100℃で３時間仮焼きし
た。次にこの仮焼物をボールミルにより湿式微粉砕し乾
燥した後、ポリビニルアルコールを含む結合剤を加えて
造粒し、3ton/cm2の圧力で成形した。この成形物を1280
〜1360℃で焼成した後、直径14mm、厚さ5mmの円板に加
工して試料を作製した。そして誘電体共振法により4GHz
において誘電率ε、誘電体のＱ（1/tan δ）、共振周波
数の低温側（−30〜＋25℃）温度係数τf1（ppm/℃）と
高温側（＋25〜80℃）温度係数τf1（ppm/℃）とを測定
した。試作測定した試料の一部の組成並びにそのマイク
ロ波誘電特性を第１表に示す。 Example] BaCo 3, TiO 2, Nd 2 O 3, Bi 2 O 3 and Al 2 O 3 powder were wet-mixed in a predetermined composition was baked for 3 hours provisionally at 1100 ° C.. Next, this calcined product was wet pulverized by a ball mill and dried, then a binder containing polyvinyl alcohol was added to granulate, and the mixture was molded at a pressure of 3 ton / cm 2 . This molded product is 1280
After firing at ˜1360 ° C., a disk having a diameter of 14 mm and a thickness of 5 mm was processed to prepare a sample. And 4GHz by dielectric resonance method
, Dielectric constant ε, dielectric Q (1 / tan δ), resonance frequency low temperature side (−30 to + 25 ℃) temperature coefficient τf 1 (ppm / ℃) and high temperature side (+25 to 80 ℃) temperature coefficient τf 1 (Ppm / ° C) was measured. Table 1 shows the composition of a part of the sample that was experimentally measured and its microwave dielectric property.
この第１表において＊印を付した試料が本発明の範囲
に入るものである。主成分の比率並びに副成分の一方で
あるBi2O3の添加量を一定に保った場合、適量のAl2O3の
添加によって特にＱ並びに温度係数τｆが改善されるこ
とが判る。 Samples marked with * in Table 1 are within the scope of the present invention. It can be seen that, when the ratio of the main component and the added amount of Bi 2 O 3 , which is one of the sub-components, are kept constant, the addition of an appropriate amount of Al 2 O 3 particularly improves the Q and the temperature coefficient τf.
なかでも、特に＊＊印を付した試料H,I,M,Nは誘電率
ε、誘電体のＱ、共振周波数の温度係数τf1,τf2のす
べてにおいて極めて良好な特性を呈している。従って本
発明の組成範囲の中でもBaOが14〜15モル％、TiO2が69
〜70モル％,Nd2O3が16モル％近傍の組成を主成分とし、
Bi2O3が約８〜９重量％,Al2Oを約0.3〜0.5重量％添加し
た組成で最も好ましいマイクロ波誘電特性が得られる。Among them, the samples H, I, M, and N marked with ** in particular exhibit extremely good characteristics in terms of the dielectric constant ε, the Q of the dielectric, and the temperature coefficients τf 1 and τf 2 of the resonance frequency. Therefore, within the composition range of the present invention, BaO is 14 to 15 mol%, and TiO 2 is 69 mol%.
~ 70 mol%, Nd 2 O 3 is the main component in the composition of about 16 mol%,
The most preferable microwave dielectric property is obtained with a composition containing about 8 to 9% by weight of Bi 2 O 3 and about 0.3 to 0.5% by weight of Al 2 O.
［発明の効果］ 本発明の上記のようにBaO−TiO2−Nd2O3の三成分系に
適量のBi2O3とAl2O3を添加した組成のマイクロ波用誘電
体磁器組成物であるから、焼結性が改善され、高い誘電
率を有し、温度係数が良好で微妙に変えることができ、
しかも損失の少ないマイクロ波誘電体特性を呈する優れ
た効果を有する。ADVANTAGES OF THE INVENTION A dielectric ceramic composition for microwaves having a composition obtained by adding an appropriate amount of Bi 2 O 3 and Al 2 O 3 to the ternary system of BaO—TiO 2 —Nd 2 O 3 as described above according to the present invention Therefore, the sinterability is improved, the dielectric constant is high, the temperature coefficient is good, and it can be delicately changed.
Moreover, it has an excellent effect of exhibiting microwave dielectric characteristics with little loss.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭52−92399（ＪＰ，Ａ) 特開 昭61−242953（ＪＰ，Ａ) 特公 昭59−6001（ＪＰ，Ｂ２) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-52-92399 (JP, A) JP-A-61-242953 (JP, A) JP-B-59-6001 (JP, B2)
Claims (1)
％,Nd2O3が15〜18モル％である組成を主成分とし、それ
に対して５〜11重量％のBi2O3と0.3〜1.0重量％のAl2O3
を添加することを特徴とするマイクロ波用誘電体磁器組
成物。1. A composition containing BaO in an amount of 10 to 16 mol%, TiO 2 in an amount of 67.5 to 72 mol% and Nd 2 O 3 in an amount of 15 to 18 mol% as a main component, and 5 to 11% by weight of Bi. 2 O 3 and 0.3-1.0 wt% Al 2 O 3
A dielectric porcelain composition for microwaves, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61262111A JP2554478B2 (en) | 1986-11-04 | 1986-11-04 | Microwave dielectric porcelain composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61262111A JP2554478B2 (en) | 1986-11-04 | 1986-11-04 | Microwave dielectric porcelain composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63117958A JPS63117958A (en) | 1988-05-21 |
| JP2554478B2 true JP2554478B2 (en) | 1996-11-13 |
Family
ID=17371189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61262111A Expired - Fee Related JP2554478B2 (en) | 1986-11-04 | 1986-11-04 | Microwave dielectric porcelain composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2554478B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01227304A (en) * | 1988-03-08 | 1989-09-11 | Toko Inc | Microwave dielectric porcelain composition material and manufacture thereof |
| US5185304A (en) * | 1990-08-20 | 1993-02-09 | Ngk Insulators, Ltd. | Dielectric ceramic composition of BaO, TiO2, Nd2 O3, Sm2 O3 and Bi2 O3 |
| SI9500374A (en) * | 1995-12-12 | 1997-06-30 | Inst Jozef Stefan | Microwave dielectric ceramics from barium, neodymium, gadolinium, titanium and bismuth |
| JPWO2010050514A1 (en) * | 2008-10-30 | 2012-03-29 | 京セラ株式会社 | Dielectric ceramic and resonator using the dielectric ceramic |
| EP2599761A4 (en) * | 2010-07-29 | 2014-07-16 | Kyocera Corp | Dielectric ceramic and dielectric filter including same |
-
1986
- 1986-11-04 JP JP61262111A patent/JP2554478B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63117958A (en) | 1988-05-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |