JP2536225B2 - Dielectric porcelain composition - Google Patents
Dielectric porcelain compositionInfo
- Publication number
- JP2536225B2 JP2536225B2 JP2090918A JP9091890A JP2536225B2 JP 2536225 B2 JP2536225 B2 JP 2536225B2 JP 2090918 A JP2090918 A JP 2090918A JP 9091890 A JP9091890 A JP 9091890A JP 2536225 B2 JP2536225 B2 JP 2536225B2
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- dielectric
- dielectric constant
- low
- geo
- temperature
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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、主にマイクロ波帯域と言われる領域におい
て使用される共振器等を構成する高周波用誘電体磁器組
成物に関する。TECHNICAL FIELD The present invention relates to a high frequency dielectric ceramic composition that constitutes a resonator or the like used mainly in a region called a microwave band.
従来の技術 近年、自動車電話、携帯電話、コードレス電話などの
無線通信機に使用される空中線共用器（デュプレクサ
ー）や電圧制御発振器等に使用される共振器、あるいは
CATV用チューナに使用されるフィルタ等にい高周波用誘
電体磁器が多く用いられている。この様な共振器等にお
いて高誘電率材料を使用することにより、高周波の波長
を真空中の の長さに短縮し、かかる周波数における１波長、1/2波
長、あるいは1/4波長のマイクロ波を高周波誘電体磁器
の中に閉じ込め、所定の作用効果が得られるように、小
形に構成したものが一般的に知られている。このような
高周波用誘電体磁器に要求される特性としては、 （１）誘電体中では電磁波の波長が に短縮され、同じ共振周波数なら誘電率が大きい程小形
化できるため、可能な限り誘電率が大であること、 （２）高周波帯域での誘電損失が小さいこと、 （３）共振周波数の温度変化に対する変化率が少ないこ
と、すなわち誘電率の温度依存性が小さくかつ安定であ
ること、 の３特性が挙げられる。2. Description of the Related Art In recent years, antennas used in wireless communication devices such as car phones, mobile phones and cordless phones, duplexers, resonators used in voltage controlled oscillators, etc., or
High-frequency dielectric porcelain is widely used in filters used in CATV tuners. By using a high dielectric constant material in such a resonator, etc. The length was shortened to 1, and the microwave of 1 wavelength, 1/2 wavelength, or 1/4 wavelength at such frequency was confined in the high frequency dielectric porcelain, and it was constructed in a small size so as to obtain a predetermined effect. Things are generally known. The characteristics required for such a high frequency dielectric porcelain include: (1) the wavelength of the electromagnetic wave in the dielectric Since the dielectric constant can be made smaller as the dielectric constant increases, the dielectric constant is as large as possible. (2) Dielectric loss in the high frequency band is small. (3) Temperature change of resonant frequency Is small, that is, the temperature dependence of the dielectric constant is small and stable, and three characteristics are listed.
また、マイクロ波帯域でも自動車電話、パーソナル無
線、コードレステレホン等に用いられる比較的低周波帯
域とされる1GHZ程度の領域において適用する場合、波長
がかなり長くなるため、共振器等の小形化を図るために
は誘電体磁器組成物としては誘電率がかなり高いものを
必要とする。Also, a car phone in a microwave band, a personal radio, when applied in 1GH Z about areas relatively is a low frequency band used in a cordless telephone or the like, the wavelength is quite long, the miniaturization of the resonator such In order to achieve this, a dielectric ceramic composition having a considerably high dielectric constant is required.
従来、この種の誘電体磁器組成物としては、例えば、
BaO−Nd2O3−TiO2−Bi2O3系組成物、BaO−Nd2O3−TiO2
−PbO系組成物などが知られている。Conventionally, as this type of dielectric ceramic composition, for example,
BaO-Nd 2 O 3 -TiO 2 -Bi 2 O 3 based compositions, BaO-Nd 2 O 3 -TiO 2
-PbO-based compositions and the like are known.
発明が解決しようとする課題 しかしながら、これらの材料においても誘電率はεｒ
＝70〜90程度であり、それ以上の高い誘電率のものを得
ようとすると、急激にＱ値が劣化するか、あるいは温度
特性が劣化し、誘電率を上げ共振器等の小形化を図るに
は限度があった。However, even in these materials, the dielectric constant is εr.
= 70 to 90, and if a dielectric constant higher than that is to be obtained, the Q value will suddenly deteriorate or the temperature characteristics will deteriorate, and the dielectric constant will be increased to reduce the size of the resonator. There was a limit.
また、誘電体グリーンシート内部電極ペーストを印刷
してそれらを積層し、その後前記内部電極ペーストと前
記誘電体グリーンシートを同時焼結させ、この焼結体に
外部電極を形成した、いわゆる積層形の誘電体共振器、
フィルタとすることにより、内部導体形状を色々な形状
に設計し、前記焼結体の大きさを共振波長に比べて大幅
に小さくすることも考えられている。In addition, a dielectric green sheet internal electrode paste is printed and laminated, and then the internal electrode paste and the dielectric green sheet are simultaneously sintered, and external electrodes are formed on this sintered body. Dielectric resonator,
It is also considered that the shape of the inner conductor is designed in various shapes by using a filter, and the size of the sintered body is made significantly smaller than the resonance wavelength.
しかしマイクロ波帯域で使用される電極には低抵抗で
あることが要求されるため、この帯域における共振器等
では一般に電極としてAu、Ag、Cu、Al等の金属が使用さ
れており、同時焼結させるにはそれらの金属の融点より
も低い温度で焼結する組成物が必要になる。However, since electrodes used in the microwave band are required to have low resistance, metals such as Au, Ag, Cu, and Al are generally used as electrodes in resonators in this band, and co-firing The composition requires a composition that sinters at a temperature below the melting point of those metals.
しかしながら、従来の高周波用誘電体磁器は1300〜15
00℃で焼結されており、マイクロ波帯域で適しているA
u、Ag、Cu等の金属材料を内部電極材料として採用する
ことができないといった課題があった。However, the conventional high frequency dielectric porcelain is 1300-15
Sintered at 00 ℃, suitable for microwave band A
There is a problem that metallic materials such as u, Ag and Cu cannot be adopted as the internal electrode material.
本発明は上記した課題に鑑み発明されたものであっ
て、高周波用共振器等のより一層の小形化を可能とす
る、誘電率が高く、誘電損失が低く、誘電率の温度依存
性が小さくかつ安定で、従って製造される誘電体共振器
の共振周波数の温度依存性が小さく、しかも融点の低い
Au、Ag−Pd等を内部電極材料として使用できる低温で焼
結可能な誘電体磁器組成物を提供することを目的として
いる。The present invention has been made in view of the above problems, and enables further miniaturization of high-frequency resonators, etc., high permittivity, low dielectric loss, and low temperature dependence of the permittivity. It is stable and therefore has a low temperature dependence of the resonance frequency of the manufactured dielectric resonator and has a low melting point.
It is an object of the present invention to provide a dielectric ceramic composition that can be sintered at low temperature and can use Au, Ag-Pd or the like as an internal electrode material.
課題を解決するための手段 本発明者は上記目的を達成するために研究を重ねた結
果、BaO、Nd2O3、Sm2O3、TiO2、PbO、Bi2O3からなる系
にGeO2、B2O3を添加することによって、高誘電率を有
し、誘電率の温度依存性、共振器における共振周波数の
温度依存性が小さく、かつ高Ｑ値の特性を有し、しか
も、Au、Ag−Pbを内部電極として使用できる1000〜1050
℃の低温で焼結可能な誘電体磁器組成物が得られること
を知見し、本発明を完成するに至った。Means for Solving the Problems As a result of repeated studies to achieve the above object, the present inventor has found that BaO, Nd 2 O 3 , Sm 2 O 3 , TiO 2 , PbO, and Bi 2 O 3 are added to a system consisting of GeO. 2 , by adding B 2 O 3 , it has a high dielectric constant, the temperature dependence of the dielectric constant and the temperature dependence of the resonance frequency in the resonator are small, and it has the characteristics of high Q value. Au, Ag-Pb can be used as internal electrodes 1000 to 1050
The inventors have found that a dielectric ceramic composition that can be sintered at a low temperature of ℃ can be obtained, and completed the present invention.
即ち、本発明に係る誘電体磁器組成物は、組成式が、 xBaO・y{(Nd２O３)1-α(Sm２O３)α}・zTiO２・uPbO・vBi２
O３ ただし、0.090＜ｘ＜0.160 0.135＜ｙ＜0.160 0.650＜ｚ＜0.670 0.045＜ｕ＜0.080 0.005＜ｖ＜0.045 ｘ＋ｙ＋ｚ＋ｕ＋ｖ＝１ ０≦α＜0.25 で示される主成分に対し、副成分としてGeO2とB2O3とが 0.5≦GeO2≦3.5重量％ 0.5≦B2O3≦2.5重量％ GeO2＋B2O3＞１重量％ の割合で添加されていることを特徴としている。That is, the dielectric ceramic composition according to the present invention has a composition formula of xBaO · y {(Nd 2 O 3 ) 1-α (Sm 2 O 3 ) α } · zTiO 2 · uPbO · vBi 2
O 3 However, 0.090 <x <0.160 0.135 <y <0.160 0.650 <z <0.670 0.045 <u <0.080 0.005 <v <0.045 x + y + z + u + v = 1 0 ≦ α <0.25, but GeO 2 as a sub-component And B 2 O 3 are added at a ratio of 0.5 ≦ GeO 2 ≦ 3.5% by weight 0.5 ≦ B 2 O 3 ≦ 2.5% by weight GeO 2 + B 2 O 3 > 1% by weight.
作用 本発明に係る誘電体磁器組成物の主成分は、REO（希
土類酸化物）−BaO−TiO2系にPbOとBi2O3とを加えた組
成物からなり、希土類酸化物としてNd2O3とSm2O3が用い
られている。そして、これら主成分に対し、1000〜1050
℃の低温焼結を可能とするため、副成分としてGeO2、B2
O3が添加されている。Action The main component of the dielectric porcelain composition according to the present invention is a REO (rare earth oxide) -BaO-TiO 2 system composition containing PbO and Bi 2 O 3, and Nd 2 O as a rare earth oxide. 3 and Sm 2 O 3 are used. And, for these main components,
GeO 2 and B 2 as auxiliary components to enable low temperature sintering at ℃
O 3 is added.
本発明においては、希土類酸化物としてNd2O3とSm2O3
の二種類を用いている。これは次の様な理由による。こ
の系において、誘電率、Ｑ値が良好で、焼結温度の低い
組成点においては、τｆを調整するために、希土類酸化
物量（本発明においては、Nd2O3とSm2O3のトータル量）
を変化させると、他の特性が劣化する。他方、Nd2O3、S
m2O3は両方とも共振周波数が温度係数τｆをマイナス側
へ移行させる性質を持つが、Sm2O3の方がその効果が大
であり、両者の割合を考慮することにより誘電率、Ｑ値
をあまり変化させずにτｆを調整できるからである。従
って、Nd2O3とSm2O3の割合を変化させることにより、適
正な範囲にτｆが調整される。In the present invention, Nd 2 O 3 and Sm 2 O 3 are used as rare earth oxides.
Two types are used. This is due to the following reasons. In this system, at the composition point where the dielectric constant and Q value are good and the sintering temperature is low, the amount of rare earth oxide (in the present invention, the total amount of Nd 2 O 3 and Sm 2 O 3) is adjusted in order to adjust τf. amount)
, The other characteristics deteriorate. On the other hand, Nd 2 O 3 , S
Both m 2 O 3 have the property that the resonance frequency shifts the temperature coefficient τf to the negative side, but Sm 2 O 3 has the greater effect, and the dielectric constant, Q This is because τf can be adjusted without changing the value so much. Therefore, τf is adjusted to an appropriate range by changing the ratio of Nd 2 O 3 and Sm 2 O 3 .
各成分が上記範囲を逸脱した場合、1000℃〜1050℃の
低温での焼結が不可能になるか、あるいは可能な場合で
も誘電率εｒが低かったり、あるいは共振周波数の温度
係数が、±20ppm/℃の範囲を出たり、あるいは、Ｑ値
が、1500以下と低くなる。If each component deviates from the above range, it becomes impossible to sinter at a low temperature of 1000 ° C to 1050 ° C, or even if possible, the dielectric constant εr is low, or the temperature coefficient of the resonance frequency is ± 20ppm. It goes out of the range of / ° C or the Q value becomes as low as 1500 or less.
実施例及び比較例 （Ｉ）誘電体磁器の調整 高純度の炭酸バリウム（BaCO3）、酸化ネオジウム（N
d2O3）、酸化サマリウム（Sm2O3）、酸化チタン（Ti
O2）、酸化鉛（PbO）、酸化ビスマス（Bi2O3）酸化ゲル
マニウム（GeO2）、無水ホウ酸（B2O3）をそれぞれ第１
表に示した比率で秤量した。Examples and Comparative Examples (I) Preparation of Dielectric Porcelain High-purity barium carbonate (BaCO 3 ), neodymium oxide (N
d 2 O 3 ), samarium oxide (Sm 2 O 3 ), titanium oxide (Ti
O 2 ), lead oxide (PbO), bismuth oxide (Bi 2 O 3 ), germanium oxide (GeO 2 ), and boric anhydride (B 2 O 3 ) are the first
Weighed in the ratios shown in the table.
上記出発原料をボールミルにて一昼夜湿式混合した後
乾燥させた。The above starting materials were wet mixed for one day in a ball mill and then dried.
上記混合物を900℃程度の温度で約２時間仮焼した。The above mixture was calcined at a temperature of about 900 ° C. for about 2 hours.
仮焼した混合物をボールミルにて一昼夜湿式扮砕した
後乾燥させた。The calcined mixture was wet-crushed overnight in a ball mill and then dried.
上記乾燥粉末に約１重量％のバインダを添加して整粒
した。About 1% by weight of a binder was added to the above dry powder to adjust the size.
約1000kg/cm2の圧力で成形し、1000〜1350℃で約２時
間空気中にて焼成した。It was molded at a pressure of about 1000 kg / cm 2 and fired in the air at 1000 to 1350 ° C. for about 2 hours.
（II）特性の測定 得られた誘電体磁器を誘電体円柱共振器法により、共
振周波数3.0〜4.0GHzにおいて誘電率、Ｑ値及び共振周
波数の温度係数について測定した。(II) Measurement of characteristics The obtained dielectric porcelain was measured for dielectric constant, Q value and temperature coefficient of resonance frequency at a resonance frequency of 3.0 to 4.0 GHz by a dielectric cylinder resonator method.
結果を第１表に示す。 The results are shown in Table 1.
以下実施例のものと比較例のものとを比べ、本発明に
係る組成範囲外での比較例における問題点を述べる。 The problems in the comparative example outside the composition range according to the present invention will be described below by comparing the example and the comparative example.
ｘ＞0.160の場合:No.1の様にＱ値が低くなる。When x> 0.160: The Q value becomes low like No.1.
ｘ＜0.090の場合:No.11の様にＱ値が低くなる。When x <0.090: The Q value becomes low as in No. 11.
ｙ＞0.160の場合:No.13の様に焼結温度が高くなる。When y> 0.160: As in No. 13, the sintering temperature becomes high.
ｙ＜0.135の場合:No.8の様にＱ値が低くなる。When y <0.135: The Q value becomes low as in No. 8.
ｚ＞0.670の場合:No.12の様にＱ値が低くなる。When z> 0.670: Q value becomes low as No.12.
ｚ＜0.650の場合:No.3の様にＱ値が低くなる。When z <0.650: Q value becomes low like No.3.
ｕ＞0.080の場合:No.14の様にＱ値が低くなる。When u> 0.080: Q value becomes low as No.14.
ｕ＜0.045の場合:No.4の様にＱ値が低くなる。When u <0.045: Q value becomes low as No.4.
ｖ＞0.045の場合:No.4の様にＱ値が低くなる。When v> 0.045: Q value becomes low like No.4.
ｖ＜0.005の場合:No.5の様にＱ値が低くなる。When v <0.005: Q value becomes low like No.5.
α＞0.025の場合:No.7の様にτｆが負側に大きくなる。When α> 0.025: As in No. 7, τf increases to the negative side.
GeO2＞3.5重量％の場合:No.26の様にτｆが負側に大き
くなる。When GeO 2 > 3.5% by weight: As in No. 26, τf increases to the negative side.
GeO2＜0.5重量％の場合:No.15、No.17、No.20の様に焼
結温度が高くなる。When GeO 2 <0.5% by weight: The sintering temperature becomes high like No.15, No.17 and No.20.
B2O3＞2.5重量％の場合:No.25の様にＱ値が低くなる。When B 2 O 3 > 2.5% by weight: Q value becomes low as No.25.
B2O3＜0.5重量％の場合:No.16、No.18の様に焼結温度が
高くなる。When B 2 O 3 <0.5% by weight: The sintering temperature becomes high like No. 16 and No. 18.
GeO2＋B2O3≦1.0重量％の場合:No.19の様に焼結温度が
高くなる。When GeO 2 + B 2 O 3 ≦ 1.0 wt%: The sintering temperature becomes high as No.19.
このように比較例のものでは上記のような問題点が残
る。As described above, the above-mentioned problems remain in the comparative example.
一方、本発明に係る組成の範囲内のものであるNo.2,
6,9,10,21,22,23,24,27については、いずれも誘電率が
εｒ＝71.0〜79.2と高く、Ｑ値もｆ×Ｑ＝1902〜2677と
高く、又、共振周波数の温度係数もτｆ＝−18.2〜＋1.
6ppm/℃と安定で、しかも1000〜1050℃で焼結でき、本
発明の目的が達成されている。On the other hand, No. 2, which is within the composition range according to the present invention,
Regarding 6,9,10,21,22,23,24,27, all have a high dielectric constant of εr = 71.0 to 79.2, a high Q value of f × Q = 1902 to 2677, and a temperature of resonance frequency. The coefficient is also τf = -18.2 to +1.
It is stable at 6 ppm / ° C. and can be sintered at 1000 to 1050 ° C., thus achieving the object of the present invention.
発明の効果 以上の説明により明らかなように、本発明に係る誘電
体磁器組成物にあっては、BaO、Nd2O3Sm2O3、TiO2、Pb
O、Bi2O3を主成分とし、副成分としてGeO2、B2O3が所定
量添加されており、誘電率及びＱ値が高く、しかも共振
周波数の温度依存性が小さく、さらにはAu、Ag−Pdを内
部電極として使用できる、低温で焼結可能な誘電体磁器
組成物を得ることができる。Effects of the Invention As is apparent from the above description, in the dielectric ceramic composition according to the present invention, BaO, Nd 2 O 3 Sm 2 O 3 , TiO 2 , Pb
O and Bi 2 O 3 are the main components, and GeO 2 and B 2 O 3 are added as the secondary components in a predetermined amount, the dielectric constant and the Q value are high, and the resonance frequency has a small temperature dependence. , Ag-Pd can be used as an internal electrode to obtain a dielectric ceramic composition that can be sintered at a low temperature.
従って、高周波用共振器、フィルタ等の大幅な小形化
が可能になり、その有用性は極めて大きい。Therefore, the size of the high-frequency resonator, the filter, etc. can be greatly reduced, and the usefulness thereof is extremely large.
Claims (1)
O３ ただし、0.090＜ｘ＜0.160 0.135＜ｙ＜0.160 0.650＜ｚ＜0.670 0.045＜ｕ＜0.080 0.005＜ｖ＜0.045 ｘ＋ｙ＋ｚ＋ｕ＋ｖ＝１ ０≦α＜0.25 で示される主成分に対し、副成分としてGeO2とB2O3とが 0.5≦GeO2≦3.5重量％ 0.5≦B2O3≦2.5重量％ GeO2＋B2O3＞１重量％ の割合で添加されていることを特徴とする誘電体磁器組
成物。1. A composition formula of xBaO · y {(Nd 2 O 3 ) 1-α (Sm 2 O 3 ) α } · zTiO 2 · uPbO · vBi 2
O 3 However, 0.090 <x <0.160 0.135 <y <0.160 0.650 <z <0.670 0.045 <u <0.080 0.005 <v <0.045 x + y + z + u + v = 1 0 ≦ α <0.25, but GeO 2 as a sub-component And B 2 O 3 are added at a ratio of 0.5 ≦ GeO 2 ≦ 3.5% by weight 0.5 ≦ B 2 O 3 ≦ 2.5% by weight GeO 2 + B 2 O 3 > 1% by weight. Composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2090918A JP2536225B2 (en) | 1990-04-04 | 1990-04-04 | Dielectric porcelain composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2090918A JP2536225B2 (en) | 1990-04-04 | 1990-04-04 | Dielectric porcelain composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03290359A JPH03290359A (en) | 1991-12-20 |
| JP2536225B2 true JP2536225B2 (en) | 1996-09-18 |
Family
ID=14011806
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| JP2090918A Expired - Fee Related JP2536225B2 (en) | 1990-04-04 | 1990-04-04 | Dielectric porcelain composition |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2858073B2 (en) * | 1992-12-28 | 1999-02-17 | ティーディーケイ株式会社 | Multilayer ceramic parts |
| US6340649B1 (en) | 1999-03-16 | 2002-01-22 | Tdk Corporation | Composition of dielectric ceramics and producing method thereof |
| KR100444224B1 (en) * | 2001-11-13 | 2004-08-16 | 삼성전기주식회사 | Dielectric Ceramic Compositions |
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| Publication number | Publication date |
|---|---|
| JPH03290359A (en) | 1991-12-20 |
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