JPH02183905A - Dielectric ceramic composite - Google Patents
Dielectric ceramic compositeInfo
- Publication number
- JPH02183905A JPH02183905A JP169189A JP169189A JPH02183905A JP H02183905 A JPH02183905 A JP H02183905A JP 169189 A JP169189 A JP 169189A JP 169189 A JP169189 A JP 169189A JP H02183905 A JPH02183905 A JP H02183905A
- Authority
- JP
- Japan
- Prior art keywords
- oxide
- dielectric constant
- mol
- barium titanate
- percent
- 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.)
- Pending
Links
- 239000000919 ceramic Substances 0.000 title claims abstract description 22
- 239000002131 composite material Substances 0.000 title claims abstract description 11
- PLDDOISOJJCEMH-UHFFFAOYSA-N neodymium(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Nd+3].[Nd+3] PLDDOISOJJCEMH-UHFFFAOYSA-N 0.000 claims abstract description 24
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910002113 barium titanate Inorganic materials 0.000 claims abstract description 19
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910000420 cerium oxide Inorganic materials 0.000 claims abstract description 13
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910000272 alkali metal oxide Inorganic materials 0.000 claims abstract description 9
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910001928 zirconium oxide Inorganic materials 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 229910001954 samarium oxide Inorganic materials 0.000 claims abstract description 8
- 229940075630 samarium oxide Drugs 0.000 claims abstract description 8
- FKTOIHSPIPYAPE-UHFFFAOYSA-N samarium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[Sm+3].[Sm+3] FKTOIHSPIPYAPE-UHFFFAOYSA-N 0.000 claims abstract description 8
- MMKQUGHLEMYQSG-UHFFFAOYSA-N oxygen(2-);praseodymium(3+) Chemical compound [O-2].[O-2].[O-2].[Pr+3].[Pr+3] MMKQUGHLEMYQSG-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910003447 praseodymium oxide Inorganic materials 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims description 25
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 239000003985 ceramic capacitor Substances 0.000 description 4
- 229910052573 porcelain Inorganic materials 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 229910021523 barium zirconate Inorganic materials 0.000 description 2
- DQBAOWPVHRWLJC-UHFFFAOYSA-N barium(2+);dioxido(oxo)zirconium Chemical compound [Ba+2].[O-][Zr]([O-])=O DQBAOWPVHRWLJC-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- DJOYTAUERRJRAT-UHFFFAOYSA-N 2-(n-methyl-4-nitroanilino)acetonitrile Chemical compound N#CCN(C)C1=CC=C([N+]([O-])=O)C=C1 DJOYTAUERRJRAT-UHFFFAOYSA-N 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000001089 mineralizing effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Inorganic Insulating Materials (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は誘電体磁器組成物に関し、特にチタン酸バリ
ウムを主体とし、たとえば積層セラミックコンデンサな
どのセラミックコンデンサに利用される誘電体磁器組成
物に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a dielectric ceramic composition, and particularly relates to a dielectric ceramic composition mainly containing barium titanate and used in ceramic capacitors such as multilayer ceramic capacitors. .
（従来技術）
従来より磁器コンデンサの誘電体磁器組成物として、チ
タン酸バリウムを主体とするものが数多く知られている
。チタン酸バリウムは、１２０℃付近にキュリー点を持
ち１００００近い誘電率を示すが、それだけでは常温で
高誘電率とはなり得ない。そこで、シフター材と呼ばれ
るものを加え、キュリー点を常温に移動させ常温で高誘
電率を持たせている。このシフター材としては、錫酸化
物ジルコニア酸化物、希土類が知られている。(Prior Art) Many dielectric ceramic compositions for ceramic capacitors have been known that are mainly composed of barium titanate. Barium titanate has a Curie point near 120° C. and exhibits a dielectric constant of nearly 10,000, but this alone cannot provide a high dielectric constant at room temperature. Therefore, something called a shifter material is added to move the Curie point to room temperature, giving it a high dielectric constant at room temperature. As this shifter material, tin oxide, zirconia oxide, and rare earth metals are known.
一方、最近の磁器コンデンサは小型化の傾向があり、特
に積層コンデンサにおいては、磁器誘電体層の厚みが１
０μｍ〜２０μｍというように薄層化する傾向にあり、
磁器のグレインサイズ（結晶粒子の大きさ）も信顛性の
面から小さいことが望まれている。On the other hand, there is a trend toward miniaturization of recent ceramic capacitors, and especially in multilayer capacitors, the thickness of the ceramic dielectric layer is 1
There is a tendency for the layer to become thinner, from 0 μm to 20 μm,
The grain size (size of crystal grains) of porcelain is also desired to be small from the viewpoint of reliability.
グレインサイズが小さいチタン酸バリウムを主体とした
誘電体磁器組成物が、たとえば特願昭５６−１８０５９
号、特願昭５７−１６８０９号。A dielectric ceramic composition mainly composed of barium titanate having a small grain size is disclosed in Japanese Patent Application No. 56-18059, for example.
No. 57-16809.
特願昭５７−１０５９１９号、特願昭５７−１９６４６
９号などで開示されている。これらは、チタン酸バリウ
ムに、酸化セリウムを加え、あるいは酸化セリウムとジ
ルコン酸バリウムとを加え、あるいは酸化ネオジウムを
加えることによって、チタン酸バリウムのグレインサイ
ズを小さ（したものである。Patent Application No. 1982-105919, Patent Application No. 57-19646
It is disclosed in issue 9 etc. These are obtained by reducing the grain size of barium titanate by adding cerium oxide, cerium oxide and barium zirconate, or adding neodymium oxide to barium titanate.
（発明が解決しようとする課題）
しかしながら、グレインサイズの小さいこれらの系の誘
電体磁器組成物では、誘電率が常温で最大１００００前
後であり、グレインサイズの大きいものに比べると、誘
電率が低く積層コンデンサを小型にした場合大きな静電
容量を取り出し難かった。(Problem to be solved by the invention) However, these types of dielectric ceramic compositions with small grain sizes have a maximum dielectric constant of around 10,000 at room temperature, which is lower than those with large grain sizes. When making multilayer capacitors smaller, it was difficult to extract large capacitance.
それゆえに、この発明の主たる目的は、グレインサイズ
が小さくしかも高い誘電率を有しかつ温度変化に対する
誘電率の変化が少ない、誘電体磁器組成物を提供するこ
とである。Therefore, the main object of the present invention is to provide a dielectric ceramic composition having a small grain size, a high dielectric constant, and a small change in dielectric constant due to temperature changes.
本発明者は、誘電体磁器のグレインサイズが１〜３μｍ
と小さい時に誘電率が１００００に満たない原因を種々
検討した結果、主原料であるチタン酸バリウムの不純物
の種類とその含有量とが多い場合誘電率が高くならない
ことを見出した。The inventor has discovered that the grain size of dielectric porcelain is 1 to 3 μm.
As a result of investigating various reasons why the dielectric constant is less than 10,000 when the barium titanate is small, it was found that the dielectric constant does not become high if the types and content of impurities in barium titanate, which is the main raw material, are large.
さらに、アルカリ金属酸化物の含有量が少ないチタン酸
バリウムにおいて、これに酸化ランタン、酸化セリウム
、酸化ネオジウム、酸化プラセオジウム、酸化サマリウ
ムから選ばれた少なくとも１種以上を加えることによっ
て、グレンサイズが小さくしかも高い誘電率を示すこと
見出した。Furthermore, by adding at least one selected from lanthanum oxide, cerium oxide, neodymium oxide, praseodymium oxide, and samarium oxide to barium titanate, which has a low content of alkali metal oxides, the grain size can be reduced. It was found that it exhibits a high dielectric constant.
また、酸化ジルコニウムおよびその複合酸化物を含有す
ることによって、誘電率の温度特性のよい誘電体磁器組
成物が得られることも見出した。It has also been found that by containing zirconium oxide and its composite oxide, a dielectric ceramic composition with good dielectric constant temperature characteristics can be obtained.
（課題を解決するための手段）
この発明は、不純物としてのアルカリ金属酸化物の含有
量が０．０３重量％以下のチタン酸バリウム１００モル
％に対して、酸化ランタン、酸化セリウム、酸化ネオジ
ウム、酸化プラセオジウム、酸化サマリウムから選ばれ
た少なくとも１種以上を２．５モル％〜５．０モル％、
および酸化ジルコニウムおよびその複合酸化物を０．５
モル％〜５．０モル％含有した、誘電体磁器組成物であ
る。(Means for Solving the Problems) This invention provides that lanthanum oxide, cerium oxide, neodymium oxide, lanthanum oxide, cerium oxide, neodymium oxide, etc. 2.5 mol% to 5.0 mol% of at least one selected from praseodymium oxide and samarium oxide;
and 0.5 zirconium oxide and its composite oxide
It is a dielectric ceramic composition containing from mol% to 5.0 mol%.
次に、この発明にかかる誘電体磁器組成物の組成範囲を
限定した理由について説明する。Next, the reason for limiting the composition range of the dielectric ceramic composition according to the present invention will be explained.
従来、工業的に大量に用いられるチタン酸バリウムは９
８．５〜９９．５％程度の純度であり、不純物としてＳ
ｒＯ，Ｃａｂ、ＭｇＯなどのアルカリ土類金属、Ｎａｇ
Ｏ，に、Ｏなどのアルカリ金属酸化物およびＡ Ｉ！
ｚ Ｏ３＊ ５１０ ｚなどの粉砕混合操作に伴う
混入物を含有するのが一般的である。Conventionally, barium titanate, which is used in large quantities industrially, is 9
It has a purity of about 8.5 to 99.5%, and contains S as an impurity.
Alkaline earth metals such as rO, Cab, MgO, Nag
Alkali metal oxides such as O, O, and A I!
It generally contains contaminants associated with the grinding and mixing operation, such as z O3 * 510 z.
この発明は、これらチタン酸バリウム中の不純物中のう
ち、特にＮａｇ Ｏｔ Ｋｇ Ｏなどのアルカリ金属
酸化物の含有量が一定限度を超えると、特性が劣化する
ことを見出したことによって考え出されたものである。This invention was conceived based on the discovery that among these impurities in barium titanate, when the content of alkali metal oxides such as NagOtKgO exceeds a certain limit, the properties deteriorate. It is something.
すなわち、この発明では、チタン酸バリウム中の不純物
のうちアルカリ金属酸化物の含有量を００３重量％以下
にする。なぜなら、その含有量が０．０３重量％を超え
ると、誘電率が１００００以下と低くなるためである。That is, in this invention, the content of alkali metal oxide among impurities in barium titanate is set to 0.03% by weight or less. This is because when the content exceeds 0.03% by weight, the dielectric constant becomes as low as 10,000 or less.
また、この発明では、アルカリ金属酸化物の不純物とし
ての含有量を上記に示すように０．０３重量％以下に抑
えたチタン酸バリウム１００モル％に対して、酸化ラン
タン、酸化セリウム、酸化ネオジウム、酸化プラセオジ
ウム、酸化サマリウムから選ばれた少なくとも１種以上
を２．５モル％〜５．０モル％含有させる。これが２．
５モル％未満では、キュリー点の移動が十分でなく常温
での誘電率が低い。一方、これが５．０モル％を超えた
場合では、キュリー点が常温より低温に移動し常温の誘
電率が低く好ましくない。In addition, in this invention, lanthanum oxide, cerium oxide, neodymium oxide, At least one selected from praseodymium oxide and samarium oxide is contained in an amount of 2.5 mol % to 5.0 mol %. This is 2.
If it is less than 5 mol %, the Curie point does not move sufficiently and the dielectric constant at room temperature is low. On the other hand, if it exceeds 5.0 mol%, the Curie point moves to a lower temperature than room temperature, and the dielectric constant at room temperature becomes low, which is not preferable.
以上のように不純物としてのアルカリ金属酸化物の含有
量が０．０３重量％以下のチタン酸バリウム１００モル
％に対して、酸化ランタン、酸化セリウム、酸化ネオジ
ウム、酸化プラセオジウム、酸化サマリウムから選ばれ
た少なくとも１種以上を２．５モル％〜５．０モル％含
有すれば、グレインサイズが小さくしかも誘電率が１１
０００以上と高い誘電体磁器組成物が得られる。As described above, for 100 mol% of barium titanate containing 0.03% by weight or less of alkali metal oxide as an impurity, lanthanum oxide, cerium oxide, neodymium oxide, praseodymium oxide, and samarium oxide were selected from lanthanum oxide, cerium oxide, neodymium oxide, praseodymium oxide, and samarium oxide. If 2.5 mol% to 5.0 mol% of at least one kind is contained, the grain size is small and the dielectric constant is 11.
000 or more, a high dielectric ceramic composition can be obtained.
しかしながら、上記の組成物では、温度変化に対する誘
電率の変化が大きくなり、ＪＩＳ規格のＦ特性などを満
足しないようになる。However, in the above composition, the change in dielectric constant with respect to temperature change becomes large, and the F characteristic of the JIS standard is no longer satisfied.
したがって、この発明では、酸化ジルコニウムおよびそ
の複合酸化物を０．５〜５．０モル％加える。酸化ジル
コニウムおよびその複合酸化物の含有量が０．５モル％
未満では、誘電率の温度特性は向上しない。一方、酸化
ジルコニウムおよびその複合酸化物の含有量が５．０モ
ル％を超えた場合には、誘電率の温度特性は向上するが
、誘電率が低下し好ましくない。このうちその複合酸化
物としては、ジルコン酸バリウム、ジルコン酸カルシウ
ムなどを用いることができ、それぞれに効果上の差異は
みられない。Therefore, in the present invention, 0.5 to 5.0 mol % of zirconium oxide and its composite oxide are added. Content of zirconium oxide and its composite oxide is 0.5 mol%
If it is less than that, the temperature characteristics of the dielectric constant will not improve. On the other hand, when the content of zirconium oxide and its composite oxide exceeds 5.0 mol %, the temperature characteristics of the dielectric constant are improved, but the dielectric constant decreases, which is not preferable. Among these, barium zirconate, calcium zirconate, etc. can be used as the composite oxide, and there is no difference in effectiveness between them.
（発明の効果）
この発明によれば、グレインサイズが小さい焼結体でし
かも誘電率が高くかつ温度変化に対する誘電率の変化が
少ない、誘電体磁器組成物が得られる。(Effects of the Invention) According to the present invention, a dielectric ceramic composition can be obtained which is a sintered body having a small grain size, a high dielectric constant, and a small change in dielectric constant with respect to temperature changes.
また、この発明にかかる誘電体磁器組成物を得るに際し
、鉱化剤としてｉｔのＭｎＣ０，，５ｉ０７．Ａｌｘ
０３ 、Ｔ ｉ Ｏ２などを添加することによっても何
ら磁器の特性を損なうことがない。Further, when obtaining the dielectric ceramic composition according to the present invention, it MnC0,,5i07. Alx
Even by adding 03, T i O2, etc., the characteristics of the porcelain are not impaired in any way.
この発明の上述の目的、その他の目的、特徴および利点
は、以下の実施例の詳細な説明から一層明らかとなろう
。The above objects, other objects, features and advantages of the present invention will become more apparent from the detailed description of the following embodiments.
（実施例）
原料として種々の純度のｆ３ ａ Ｃｏ、とＴｉｅｔと
を用い、これらをｌ３ａＣＯ３とＴ ｉ Ｏ，とのモル
比率が１．０００となるように秤量し、ジルコニア玉石
を用いたボールミルによって１６時時間式混合を行って
、混合物を得た。(Example) Using f3a Co and Tiet of various purity as raw materials, they were weighed so that the molar ratio of l3aCO3 and TiO was 1.000, and were milled using a ball mill using zirconia cobbles. Mixing was carried out for 16 hours to obtain a mixture.
得られた混合物中の水分を蒸発した後、１１５０℃で２
時間保持して仮焼し、再びボールミルで平均粒径が２μ
ｍ以下になるまで粉砕した。このようにして、第１表の
Ａ、Ｂ、ＣおよびＤで示す純度の異なる４種類のチタン
酸バリウムを得た。After evaporating the water in the resulting mixture, it was heated at 1150°C for 2
Temporarily calcined for a period of time, then ball milled again to achieve an average particle size of 2μ.
It was pulverized until it was less than m. In this way, four types of barium titanate having different purity shown as A, B, C and D in Table 1 were obtained.
そして、このチタン酸バリウム１００モル％に対して、
第２表に示すように、酸化セリウム、酸化ネオジウムな
どを秤量し、酢酸ビニルバインダを加えて１６時時間式
混合して混合物を得た。この混合物を乾燥後造粒した後
２０００ｋｇ／ｃｎ！の圧力で直径１０ｍｍ、厚さ１龍
の円板に成形した。それから円板を、第３表に示す温度
で２時間焼成して、円板状の磁器を得た。And, for this barium titanate 100 mol%,
As shown in Table 2, cerium oxide, neodymium oxide, etc. were weighed, a vinyl acetate binder was added, and the mixture was mixed for 16 hours to obtain a mixture. After drying and granulating this mixture, the weight was 2000 kg/cn! It was molded into a disc with a diameter of 10 mm and a thickness of 1 dragon at a pressure of . The disks were then fired for 2 hours at the temperatures shown in Table 3 to obtain disk-shaped porcelain.
得られた磁器の両生面に銀電極を焼き付けて測定試料（
コンデンサ）とし、その室温での誘電率、誘電損失およ
び温度変化に対する静電容量の変化率を測定し、その結
果を第３表に併せて示した。A measurement sample (
The dielectric constant at room temperature, dielectric loss, and rate of change in capacitance with respect to temperature change were measured, and the results are also shown in Table 3.
なお、誘電率（ε）および誘電損失（ｔａｎδ）は温度
２５℃２周波数１ｋＨｚで測定し、温度変化に対する静
電容量の変化率については、２０°Ｃでの静電容量を基
準とした８５℃での変化率（八〇／Ｃ，。）を示した。The dielectric constant (ε) and dielectric loss (tan δ) were measured at a temperature of 25°C and a frequency of 1kHz, and the rate of change in capacitance with respect to temperature change was measured at 85°C based on the capacitance at 20°C. The rate of change (80/C,.) is shown.
第１表、第２表および第３表に示す結果に基づいて、こ
の発明の誘電体磁器組成物の組成範囲を限定した理由に
ついて説明する。Based on the results shown in Tables 1, 2, and 3, the reason for limiting the composition range of the dielectric ceramic composition of the present invention will be explained.
酸化ランタン、酸化セリウム、酸化ネオジウムの含有量
が少ない場合（試料番号１および２参照）では、常温で
の誘電率が低くなってしまう。When the content of lanthanum oxide, cerium oxide, and neodymium oxide is small (see sample numbers 1 and 2), the dielectric constant at room temperature becomes low.
一方、酸化セリウム、酸化ネオジウム、酸化サマリウム
の含有量が多い場合（試料番号１２および１３参照）で
は、誘電率が低くなってしまう。On the other hand, when the content of cerium oxide, neodymium oxide, and samarium oxide is large (see sample numbers 12 and 13), the dielectric constant becomes low.
酸化ジルコニウムの含有量が少ない場合（試料番号１４
参照）では、誘電率の変化率が一８０％を超えてしまい
好ましくない。When the content of zirconium oxide is low (sample number 14
), the rate of change in dielectric constant exceeds 180%, which is undesirable.
酸化ジルコニウムの含有量が多い場合（試料番号１５参
照）では、誘電率の変化率は少ないが誘電率が大幅に減
少してしまう。When the content of zirconium oxide is large (see sample number 15), the rate of change in dielectric constant is small, but the dielectric constant decreases significantly.
また、アルカリ金属酸化物の含有量が多いチタン酸バリ
ウム原料ＣおよびＤを用いた場合（試料番号Ｌ６および
１７参照）では、いずれも誘電率が低い。Furthermore, when barium titanate raw materials C and D containing a large amount of alkali metal oxide are used (see sample numbers L6 and 17), both have low dielectric constants.
それに対して、この発明の範囲内である誘電体磁器組成
物（試料番号３〜１１．１８〜２０参照）では、いずれ
も、磁器の焼結体のグレインサイズが１〜３μｍと小さ
く、誘電率が１１０００以上と高く、しかも、２０℃を
基準にした８５℃での誘電率の変化率が一８０％以内で
ありＪＩＳ規格のＦ特性を満足する。On the other hand, in the dielectric ceramic compositions (see sample numbers 3 to 11 and 18 to 20) within the scope of the present invention, the grain size of the sintered ceramic body is as small as 1 to 3 μm, and the dielectric constant is as high as 11,000 or more, and the rate of change in dielectric constant at 85°C based on 20°C is within 180%, satisfying the F characteristics of the JIS standard.
また、鉱化剤を加えた場合（試料番号１８〜２０参照）
では、１３２０℃と他の試料に比べて焼成温度を低くす
ることができる。Also, when mineralizing agent is added (see sample numbers 18 to 20)
In this case, the firing temperature can be lowered to 1320° C. compared to other samples.
以上のように、この発明の範囲内にある誘電体磁器組成
物は、グレインサイズが小さくしかも高い誘電率を有し
かつ温度変化に対する誘電率の変化が少ないことが明ら
かである。As described above, it is clear that the dielectric ceramic composition within the scope of the present invention has a small grain size, a high dielectric constant, and little change in the dielectric constant with respect to temperature changes.
そして、この発明にかかる誘電体磁器組成物を用いるこ
とによって、小型、大容量で温度特性のよい積層コンデ
ンサを得ることができる。By using the dielectric ceramic composition according to the present invention, a multilayer capacitor that is small in size, has a large capacity, and has good temperature characteristics can be obtained.
特許出願人 株式会社 村田製作所 代理人 弁理士 岡 １） 全 啓 第 表Patent applicant Murata Manufacturing Co., Ltd. Agent: Patent Attorney Oka 1) Zenhiro No. table
Claims (1)
重量％以下のチタン酸バリウム１００モル％に対して、 酸化ランタン，酸化セリウム，酸化ネオジウム，酸化プ
ラセオジウム，酸化サマリウムから選ばれた少なくとも
１種以上を２．５モル％〜５．０モル％、および 酸化ジルコニウムおよびその複合酸化物を０．５モル％
〜５．０モル％含有した、誘電体磁器組成物。[Claims] The content of alkali metal oxide as an impurity is 0.03.
2.5 mol% to 5.0 mol% of at least one selected from lanthanum oxide, cerium oxide, neodymium oxide, praseodymium oxide, and samarium oxide based on 100 mol% of barium titanate of 2.5 mol% to 5.0 mol% by weight or less; 0.5 mol% of zirconium oxide and its composite oxide
A dielectric ceramic composition containing ~5.0 mol%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP169189A JPH02183905A (en) | 1989-01-06 | 1989-01-06 | Dielectric ceramic composite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP169189A JPH02183905A (en) | 1989-01-06 | 1989-01-06 | Dielectric ceramic composite |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02183905A true JPH02183905A (en) | 1990-07-18 |
Family
ID=11508549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP169189A Pending JPH02183905A (en) | 1989-01-06 | 1989-01-06 | Dielectric ceramic composite |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02183905A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04334807A (en) * | 1991-05-13 | 1992-11-20 | Murata Mfg Co Ltd | Dielectric porcelain composite |
| JPH04334809A (en) * | 1991-05-13 | 1992-11-20 | Murata Mfg Co Ltd | Dielectric porcelain composite |
| JPH04334808A (en) * | 1991-05-13 | 1992-11-20 | Murata Mfg Co Ltd | Dielectric porcelain composite |
-
1989
- 1989-01-06 JP JP169189A patent/JPH02183905A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04334807A (en) * | 1991-05-13 | 1992-11-20 | Murata Mfg Co Ltd | Dielectric porcelain composite |
| JPH04334809A (en) * | 1991-05-13 | 1992-11-20 | Murata Mfg Co Ltd | Dielectric porcelain composite |
| JPH04334808A (en) * | 1991-05-13 | 1992-11-20 | Murata Mfg Co Ltd | Dielectric porcelain composite |
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