JPH06101244B2 - Dielectric porcelain composition - Google Patents
Dielectric porcelain compositionInfo
- Publication number
- JPH06101244B2 JPH06101244B2 JP990884A JP990884A JPH06101244B2 JP H06101244 B2 JPH06101244 B2 JP H06101244B2 JP 990884 A JP990884 A JP 990884A JP 990884 A JP990884 A JP 990884A JP H06101244 B2 JPH06101244 B2 JP H06101244B2
- Authority
- JP
- Japan
- Prior art keywords
- mol
- dielectric constant
- dielectric
- 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 - Lifetime
Links
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- Inorganic Insulating Materials (AREA)
- Ceramic Capacitors (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は結晶粒径が微細で、しかも温度特性が良好な誘
電体磁器組成物に関する。TECHNICAL FIELD The present invention relates to a dielectric ceramic composition having a fine crystal grain size and good temperature characteristics.
従来コンデンサ等に使用する高誘電率の誘電体組成物と
して、チタン酸バリウムにシフターとしてLa2O3やClO2
等の希土類を添加し、そのキユーリー点Tcを室温付近に
シフトして、誘電率が高く、かつ微細な結晶を持つもの
が使用されている。As a high dielectric constant dielectric composition used for conventional capacitors, barium titanate is used as a shifter for La 2 O 3 and ClO 2
A rare earth element such as is added, and its Curie point Tc is shifted to around room temperature to have a high dielectric constant and a fine crystal.
しかしながらこのような誘電体では、誘電率の温度特性
が大きく、実用上製品の品種が限定される等の欠点があ
つた。However, such a dielectric has a drawback that the temperature characteristic of the permittivity is large and the product types are practically limited.
本発明は前記の如き結晶粒径が微細な高誘電率の誘電体
組成物において、誘電率の温度特性が大きいという問題
点を改善した、温度特性の良好な新規の誘電体磁器組成
物を提供することである。The present invention provides a novel dielectric porcelain composition having good temperature characteristics, which has improved the problem of large temperature characteristics of the dielectric constant in the high dielectric constant dielectric composition having a fine crystal grain size as described above. It is to be.
前記の問題点を改善するため、本発明の誘電体磁器組成
物では、バリウム、チタン、ジルコニウムの酸化物がそ
れぞれBaO47.9〜48.4mol％、TiO250.6〜51.6mol％、ZrO
20.5〜1.0mol％からなる組成物100重量部に対して、セ
リウム、マンガンの酸化物をそれぞれCeO22.8wt％、MnO
0.1〜0.5wt％添加したことを特徴とする。In order to improve the above-mentioned problems, in the dielectric ceramic composition of the present invention, oxides of barium, titanium and zirconium are BaO 47.9 to 48.4 mol%, TiO 2 50.6 to 51.6 mol% and ZrO, respectively.
2 cerium and manganese oxides were added to CeO 2 2.8 wt% and MnO, respectively, per 100 parts by weight of the composition consisting of 0.5 to 1.0 mol%.
The feature is that 0.1 to 0.5 wt% is added.
そしてこのような組成の誘電体磁器組成物により、本発
明の目的とする誘電率が大きく粒径が小さく、しかも温
度特性の良好なものを得られることが判明した。It has been found that the dielectric ceramic composition having such a composition can provide the object of the present invention, which has a large dielectric constant and a small particle size, and has good temperature characteristics.
本発明を実施例に基づき詳細に説明する。 The present invention will be described in detail based on examples.
原料としてBaCO3,TiO2,CeO2,ZrO2,MnCO3を焼成後にそれ
ぞれBaO47.4〜49.0モル％,TiO245.1〜51.6モル％,ZrO
20.5〜5.0モル％,CeO21.0〜3.7wt％,MnO0.1〜0.5wt％と
なるように秤量、配合し、これをボールミルにて湿式混
合し、脱水、乾燥後、仮焼成を行つた。そしてこの仮焼
成したものを粉砕し、成形圧力3ton/cm2で直径16mm、厚
さ0.6mmに加圧成形し、この成形物を1340℃の温度で２
時間焼成した。After firing BaCO 3 , TiO 2 , CeO 2 , ZrO 2 and MnCO 3 as raw materials, BaO 47.4 to 49.0 mol%, TiO 2 45.1 to 51.6 mol% and ZrO, respectively
2 0.5 to 5.0 mol%, CeO 2 1.0 to 3.7 wt%, MnO 0.1 to 0.5 wt% Weighed and blended, wet mixed with a ball mill, dehydrated, dried, and calcined . Then, this calcined product is crushed and pressure-molded at a molding pressure of 3 ton / cm 2 to a diameter of 16 mm and a thickness of 0.6 mm, and this molded product is subjected to 2340 at a temperature of 1340 ° C.
Burned for hours.
このようにして得られた誘電体磁器の両面に銀電極をメ
ツキしてコンデンサを形成した後、その誘電率、tanδ
を1KHzの周波数でYHP（横河・ヒユーレツト・パツカー
ド株式会社）製のLCRメータを使用して測定した。又、
結晶粒径は走査形電子顕微鏡にて2000倍で観察した。温
度特性は恒温槽を使用し、前記YHPのLCRメータを使用し
てこれまた1KHzの周波数にて測定した。After forming a capacitor by plating silver electrodes on both sides of the dielectric ceramic thus obtained, its dielectric constant, tanδ
Was measured at a frequency of 1 KHz using an LCR meter manufactured by YHP (Yokogawa / Hyuret / Patsucard Co., Ltd.). or,
The crystal grain size was observed with a scanning electron microscope at a magnification of 2000. The temperature characteristics were measured by using a constant temperature bath and the YHP LCR meter at a frequency of 1 KHz.
温度特性Tc−60はキユーリー点での誘電率εｃとキユー
リー点より60℃高温側での誘電率ε60から次式によつて
算出した。The temperature characteristic Tc-60 was calculated from the dielectric constant εc at the Curie point and the dielectric constant ε 60 at a temperature of 60 ° C. higher than the Curie point by the following formula.
このようにして得られた各試料の試験条件及び測定結果
を第１表に示す。 Table 1 shows the test conditions and measurement results of each sample thus obtained.
第１表で試料番号1,2,5,6,7,9,10,11,12,13,14,15,18は
本発明の範囲外である。 In Table 1, sample numbers 1,2,5,6,7,9,10,11,12,13,14,15,18 are outside the scope of the present invention.
この第１表からBaOが47.9モル％未満の場合や48.4モル
％を越えるの場合では、誘電率εｓが低く、実用性に乏
しいことがわかる。From Table 1, it can be seen that when BaO is less than 47.9 mol% or more than 48.4 mol%, the dielectric constant εs is low and the practicality is poor.
又、ZrO2を0.5モル％以上添加すると温度特性が改善さ
れるが、1.0モル％を越えると誘電率εｓが低下し過ぎ
てしまう。TiO2が51.6モル％を越えるとキユーリー点が
一側にいき過ぎ温度特性の変化が大となり実用的でない
か、又は誘電率が小さくなる。50.6モル％未満では誘電
体損失が悪化する。When ZrO 2 is added in an amount of 0.5 mol% or more, the temperature characteristics are improved, but when it exceeds 1.0 mol%, the dielectric constant εs is excessively lowered. If the content of TiO 2 exceeds 51.6 mol%, the Curie point will move to one side and the temperature characteristics will change greatly, which is not practical or the dielectric constant will decrease. If it is less than 50.6 mol%, the dielectric loss is deteriorated.
ZrO2はCeO2と同様にシフターとしての働きもあるが、必
要なTc−60と誘電率が得られるZrO2の量だけではキユー
リー点が高温に行き過ぎている。従つてキユーリー点を
室温付近へ移動させるためにCeO2で補正することが必要
であり、CeO22.8wt％が適当である。これにもとづき、
温度特性Tc−60が−73〜−79％でありY5V特性を満たす
ものとなり、誘電率εが7,300〜10,000と比較的高いも
のとすることが可能となり、誘電体損失tanδが0.2〜0.
6％と比較的良い。Like CeO 2 , ZrO 2 also functions as a shifter, but the Curie point has reached an excessively high temperature only with the amount of ZrO 2 that can provide the required Tc-60 and dielectric constant. Therefore, it is necessary to correct with CeO 2 in order to move the Curie point to near room temperature, and CeO 2 2.8 wt% is appropriate. Based on this,
The temperature characteristic Tc-60 is -73 to -79%, which satisfies the Y5V characteristic, and the permittivity ε can be relatively high as 7,300 to 10,000, and the dielectric loss tan δ is 0.2 to 0.
6% is relatively good.
MnOは磁器の焼結性向上のために添加するものである
が、0.5wt％以上の添加量では誘電率が低下し、絶縁抵
抗も低下し実用的でない。MnO is added to improve the sinterability of porcelain, but if it is added in an amount of 0.5 wt% or more, the dielectric constant decreases and the insulation resistance also decreases, which is not practical.
以上の説明のように、本発明による誘電体磁器は誘電率
が高く、温度特性が良好で、しかも結晶粒径が1.5〜2.0
μｍの細かい特徴があるので、例えば積層コンデンサ等
の材料として好適である。As described above, the dielectric ceramic according to the present invention has a high dielectric constant, good temperature characteristics, and a crystal grain size of 1.5 to 2.0.
Since it has a fine feature of μm, it is suitable as a material for, for example, a multilayer capacitor.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭58−223669（ＪＰ，Ａ) 特開 昭58−106702（ＪＰ，Ａ) 特開 昭54−26500（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-58-223669 (JP, A) JP-A-58-106702 (JP, A) JP-A-54-26500 (JP, A)
Claims (1)
がそれぞれBaO47.9〜48.4mol％、TiO250.6〜51.6mol
％、ZrO20.5〜1.0mol％からなる組成物100重量部に対し
て、セリウム、マンガンの酸化物をそれぞれCeO22.8wt
％、MnO0.1〜0.5wt％添加したことを特徴とする誘電体
磁器組成物。1. Oxides of barium, titanium and zirconium are BaO 47.9 to 48.4 mol% and TiO 2 50.6 to 51.6 mol, respectively.
%, ZrO 2 0.5-1.0 mol% to 100 parts by weight of a composition, cerium and manganese oxides CeO 2 2.8 wt.
%, MnO 0.1-0.5 wt% was added.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP990884A JPH06101244B2 (en) | 1984-01-23 | 1984-01-23 | Dielectric porcelain composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP990884A JPH06101244B2 (en) | 1984-01-23 | 1984-01-23 | Dielectric porcelain composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60154404A JPS60154404A (en) | 1985-08-14 |
| JPH06101244B2 true JPH06101244B2 (en) | 1994-12-12 |
Family
ID=11733205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP990884A Expired - Lifetime JPH06101244B2 (en) | 1984-01-23 | 1984-01-23 | Dielectric porcelain composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06101244B2 (en) |
-
1984
- 1984-01-23 JP JP990884A patent/JPH06101244B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60154404A (en) | 1985-08-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |