JPS5951092B2 - dielectric porcelain composition - Google Patents
dielectric porcelain compositionInfo
- Publication number
- JPS5951092B2 JPS5951092B2 JP55141221A JP14122180A JPS5951092B2 JP S5951092 B2 JPS5951092 B2 JP S5951092B2 JP 55141221 A JP55141221 A JP 55141221A JP 14122180 A JP14122180 A JP 14122180A JP S5951092 B2 JPS5951092 B2 JP S5951092B2
- Authority
- JP
- Japan
- Prior art keywords
- mol
- dielectric constant
- temperature coefficient
- composition
- porcelain composition
- 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
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- Compositions Of Oxide Ceramics (AREA)
- Ceramic Capacitors (AREA)
- Inorganic Insulating Materials (AREA)
Description
【発明の詳細な説明】
本発明は誘電体磁器組成物にかかり、特に温度係数が小
さく、誘電率が高く、高周波での損失角の小さい誘電体
磁器組成物を提供しようとするものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dielectric ceramic composition, and in particular, it is an object of the present invention to provide a dielectric ceramic composition that has a small temperature coefficient, a high dielectric constant, and a small loss angle at high frequencies.
これまで誘電体磁器組成物としてはＭｇＴｉＯ３系、Ｃ
ａＴｉＯ３、ＳｒＴｉＯ３系、ＣａＴｉＯ３−Ｌａ２Ｏ
３・２Ｔｉ０２−ＭｇＴｉＯ３系、およびＢａＯ−Ｔｉ
Ｏ２−Ｎｄ２Ｏ３系等の組成物が使用されて来ている。Until now, dielectric ceramic compositions such as MgTiO3, C
aTiO3, SrTiO3 system, CaTiO3-La2O
3.2Ti02-MgTiO3 system, and BaO-Ti
Compositions such as the O2-Nd2O3 system have been used.
これらは、誘電率が１５〜２８０の範囲内で温度係数が
＋１００×１０−０〜−４５０×１０−６／℃の範囲内
にある。これら磁器組成物の最大の欠点は、温度係数が
小さくなるに従つて、高い誘電率が得られなくなり、さ
らに高周波での損失角も悪化するということである。コ
ンデンサを設計するにあたり、温度係数が特定の値に限
定された大容量のコンデンサを得るためには、電極の対
向面積を広げ、素体の厚みを薄くする以外に方法がない
。These have a dielectric constant in the range of 15 to 280 and a temperature coefficient in the range of +100 x 10-0 to -450 x 10-6/°C. The biggest drawback of these ceramic compositions is that as the temperature coefficient decreases, a high dielectric constant cannot be obtained, and the loss angle at high frequencies also deteriorates. When designing a capacitor, the only way to obtain a high-capacity capacitor with a temperature coefficient limited to a specific value is to widen the opposing area of the electrodes and reduce the thickness of the element body.
また、素体を薄くすると耐電圧特性の低下を来たすため
、あまり素体を薄くすることができない。したがつて、
この対策としては温度係数を小さくし、誘電率を高くし
、耐電圧を高くする以外に方法がない。近年、カラーテ
レビジョン受像機の中間周波増巾回路等において温度補
償用磁器コンデンサが広く使用されるようになつて来て
おり、特に温度係数が小さく（−３５０×１０−０〜＋
１００×１０−０／℃）、また、高周波での損失角が小
さく、誘電率の高い材料が要望されるようになつている
。Furthermore, if the element body is made thinner, the withstand voltage characteristics deteriorate, so it is not possible to make the element body very thin. Therefore,
The only way to counter this problem is to reduce the temperature coefficient, increase the dielectric constant, and increase the withstand voltage. In recent years, temperature-compensating ceramic capacitors have become widely used in the intermediate frequency amplification circuits of color television receivers, etc.
100 x 10-0/°C), and materials with a small loss angle at high frequencies and a high dielectric constant are now in demand.
さらに、誘電体共振器用として、マイクロ波周波数帯で
の損失が小さく、かつ共振周波数の温度依存性が直線的
であるものが要望されている。フ本発明は、上述のよう
な問題点を解決し、温度係数が小さく、誘電率が高く、
高周波での損失角が小さく、また耐電圧の高い誘電体磁
器組成物を実現したものである。Further, for dielectric resonators, there is a demand for a dielectric resonator with low loss in the microwave frequency band and with linear temperature dependence of the resonant frequency. The present invention solves the above-mentioned problems and has a small temperature coefficient, high dielectric constant,
The dielectric ceramic composition has a small loss angle at high frequencies and a high withstand voltage.
すなわち、この組成物は、ＴｉＯ２が６３〜７２モル％
、ＢａＯが７〜１２．５モル％、７Ｎｄ２Ｏ３が９〜１
６モル％、Ｂｉ２Ｏ３が２〜６．５モル％、Ｌａ２ｏ３
が０．５〜３モル％、およびｐｒ６ｏ、１が０．５〜２
．５モル％の範囲内の組成を有する。なお、本発明の磁
器組成物において、上記組成に限定したのは、次の理由
による。That is, this composition contains 63 to 72 mol% of TiO2.
, BaO is 7-12.5 mol%, 7Nd2O3 is 9-1
6 mol%, Bi2O3 2-6.5 mol%, La2o3
is 0.5 to 3 mol%, and pr6o, 1 is 0.5 to 2
．． It has a composition within the range of 5 mol%. The reason why the ceramic composition of the present invention is limited to the above composition is as follows.
すなわち、ＴｉＯ２成分が６３モル％よりも少なくなる
と、誘電率が低下し、また７２モル％より多くなると、
温度係数が負に大きくなるために、好ましくない。Ｂａ
Ｏ成分が７モル％よりも少なくなると、誘電率が低下し
、また、１２．５モル％より多くなると、破壊電圧が低
下して耐電圧性が悪化するだけでなく、温度係数が負に
大きくなるので、好ましくない。Ｎｄ２Ｏ３成分が９モ
ル％より少なくなると、高周波での損失角が悪化し、１
６モル％より多くなると、誘電率が極度に低下するので
、好ましくない。Ｂｉ２Ｏ３成分が２モル％より少ない
と、温度係数を小さくするという効果が乏しくなり、ま
た、それが６．５モル％よりも多くなると、破壊電圧が
６低下して耐電圧性が悪くなるので、好ましくない。Ｌ
ａ２Ｏ３成分は特に高周波での損失角を小さくするに有
用なものであるが、それが０．５モル％よりも少ないと
その効果が乏しくなり、また、３モル％より多いと誘電
率が低下するので、やはり好二ましくない。Ｐｒ６Ｏｌ
ｌ成分が０．５モル％よりも少ないと、高周波での損失
角が悪化し、また、２．５モル％より多いと、その誘電
率が低下するため、好ましくない。以上、各成分の組成
比の限定理由について述べ２て来たが、これら各成分が
それぞれ単独では本発明の目的を実現することはできな
い。That is, when the TiO2 component is less than 63 mol%, the dielectric constant decreases, and when it is more than 72 mol%,
This is not preferable because the temperature coefficient becomes negative. Ba
When the O component is less than 7 mol%, the dielectric constant decreases, and when it exceeds 12.5 mol%, not only the breakdown voltage decreases and the withstand voltage property deteriorates, but also the temperature coefficient becomes negative and large. Therefore, it is not desirable. When the Nd2O3 component is less than 9 mol%, the loss angle at high frequencies worsens, and 1
If it exceeds 6 mol %, the dielectric constant will be extremely lowered, which is not preferable. If the Bi2O3 component is less than 2 mol%, the effect of reducing the temperature coefficient will be poor, and if it is more than 6.5 mol%, the breakdown voltage will drop by 6 and the withstand voltage will deteriorate. Undesirable. L
The a2O3 component is particularly useful for reducing the loss angle at high frequencies, but if it is less than 0.5 mol%, the effect will be poor, and if it is more than 3 mol%, the dielectric constant will decrease. So, I still don't like it. Pr6Ol
If the l component is less than 0.5 mol %, the loss angle at high frequencies will worsen, and if it is more than 2.5 mol %, the dielectric constant will decrease, which is not preferable. Although the reason for limiting the composition ratio of each component has been described above, the object of the present invention cannot be achieved by each of these components alone.
上記６成分が上記組成範囲内にあつてはじめて良好な特
性を示す固溶体の磁器が得られるものである。次に、本
発明にかかる磁器組成物の実施例ならびに比較例をあげ
て、詳細に説明する。A solid solution porcelain exhibiting good properties can only be obtained when the above six components are within the above composition range. Next, examples and comparative examples of the ceramic composition according to the present invention will be given and explained in detail.
出発材料として、ＴｌＯ２、ＢａＣＯ３，Ｎｄ２Ｏ３，
Ｂｌ２Ｏ３，Ｌａ２Ｏ３、およびＰｒ６Ｏｌｌを使用し
た。As starting materials, TlO2, BaCO3, Nd2O3,
Bl2O3, La2O3, and Pr6Oll were used.
これら成分を下表の組成比率になるよう秤取し、それぞ
れに焼成時の還元性を防止するために酸化剤として０．
２重量％のＭｎＯ２と０．１重量％のＳｉＯ２とをそれ
ぞれ添加した。配合物それぞれをウレタン内張リポツト
ミルで湿式混合し、その後水分を蒸発させてから、１１
００℃で１．５時間仮焼成した。得られた仮焼成物それ
ぞれを微粉砕してから、圧力約１０００ｋｇ／Ｃｎｌ２
で直径２０ｍｍ、厚さ１ｍｍの円板状に成型した。これ
ら成型物を１３００℃で２時間保持して焼成した。得ら
れた磁器素体のそれぞれに公知の方法で銀電極を焼付け
て形成した。なお、耐湿負荷寿命試験には、銀電極にリ
ード線をそれぞれ接続してからフエノール樹脂で被覆し
、さらにワツクス含浸をした、試料を使用した。耐湿負
荷寿命試験は、温度６０℃、相対湿度９５％・の雰囲気
中において、電極間に直流電圧１０００Ｖを２０００時
間印加するという条件で実施した。各試料の特性を下表
にまとめて示す。These components were weighed out to have the composition ratio shown in the table below, and 0.0% of each was added as an oxidizing agent to prevent reducibility during firing.
2% by weight of MnO2 and 0.1% by weight of SiO2 were added respectively. Each formulation was wet-mixed in a urethane-lined lipomill, the water was then evaporated, and then 11
Temporary firing was performed at 00°C for 1.5 hours. After finely pulverizing each of the obtained calcined products, the pressure was about 1000 kg/Cnl2.
It was molded into a disk shape with a diameter of 20 mm and a thickness of 1 mm. These molded products were held at 1300° C. for 2 hours and fired. Silver electrodes were formed by baking on each of the obtained porcelain bodies using a known method. For the humidity resistance load life test, samples were used in which lead wires were connected to silver electrodes, which were then coated with phenol resin and further impregnated with wax. The humidity resistance load life test was carried out under the conditions of applying a DC voltage of 1000 V between the electrodes for 2000 hours in an atmosphere with a temperature of 60° C. and a relative humidity of 95%. The characteristics of each sample are summarized in the table below.
上表において、試料２〜７が本発明の実施例であり、他
の試料１，８〜１０は比較例である。In the above table, samples 2 to 7 are examples of the present invention, and other samples 1 and 8 to 10 are comparative examples.
上表の結果から明らかなように、本発明の範囲内の組成
物では良好な特性が得られる。特に、試料３は誘電率が
高く、高周波（１０ＭＨｚ）でのＱ値が大きく （すな
わち損失角が小さい）、耐湿負荷寿命特性の良好なもの
である。さらに、破壊電圧が高く、温度係数も士０ｐｐ
ｍ／℃と小さく、良好なものであつた。以上の説明から
明らかなように、本発明にかかる磁器組成物は、小さな
温度係数を有し、高い誘電率Ｑ値を有し、破壊電圧の高
いものである。As is clear from the results in the above table, good properties can be obtained with the compositions within the scope of the present invention. In particular, Sample 3 has a high dielectric constant, a large Q value at high frequency (10 MHz) (that is, a small loss angle), and good moisture resistance and load life characteristics. Furthermore, the breakdown voltage is high and the temperature coefficient is 0pp.
m/°C, which was small and good. As is clear from the above description, the ceramic composition according to the present invention has a small temperature coefficient, a high dielectric constant Q value, and a high breakdown voltage.
Claims (1)
．５モル％、Ｎｄ＿２Ｏ＿３が９〜１６モル％、Ｂｉ＿
２Ｏ＿３が２〜６．５モル％、Ｌａ＿２Ｏ＾３が０．５
〜３モル％、およびＰｒ＿６Ｏ＿１＿１が０．５〜２．
５モル％の範囲内の組成を有することを特徴とする誘電
体磁器組成物。1 TiO_2 63-72 mol%, BaO 7-12
．． 5 mol%, Nd_2O_3 9-16 mol%, Bi_
2O_3 is 2 to 6.5 mol%, La_2O^3 is 0.5
~3 mol%, and Pr_6O_1_1 between 0.5 and 2.
A dielectric ceramic composition having a composition within the range of 5 mol%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55141221A JPS5951092B2 (en) | 1980-10-09 | 1980-10-09 | dielectric porcelain composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55141221A JPS5951092B2 (en) | 1980-10-09 | 1980-10-09 | dielectric porcelain composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5765605A JPS5765605A (en) | 1982-04-21 |
| JPS5951092B2 true JPS5951092B2 (en) | 1984-12-12 |
Family
ID=15286936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55141221A Expired JPS5951092B2 (en) | 1980-10-09 | 1980-10-09 | dielectric porcelain composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5951092B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4500942A (en) * | 1982-11-12 | 1985-02-19 | Ferro Corporation | Temperature stable monolithic capacitors and ceramic compositions for producing same |
| JPS61215255A (en) * | 1985-03-18 | 1986-09-25 | 京セラ株式会社 | Dielectric ceramic composition |
-
1980
- 1980-10-09 JP JP55141221A patent/JPS5951092B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5765605A (en) | 1982-04-21 |
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