JP2010215430A - Dielectric ceramic composition and electronic component - Google Patents

Dielectric ceramic composition and electronic component Download PDF

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JP2010215430A
JP2010215430A JP2009061534A JP2009061534A JP2010215430A JP 2010215430 A JP2010215430 A JP 2010215430A JP 2009061534 A JP2009061534 A JP 2009061534A JP 2009061534 A JP2009061534 A JP 2009061534A JP 2010215430 A JP2010215430 A JP 2010215430A
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dielectric
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dielectric ceramic
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JP5035278B2 (en
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Takao Nakamura
Daisuke Sato
Matsumi Watanabe
孝男 中村
大輔 佐藤
松巳 渡辺
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Tdk Corp
Ｔｄｋ株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a dielectric ceramic composition that shows a relatively high specific dielectric constant (e.g. ≥600) and a small dielectric loss (e.g. ≤0.3% at 100 KHz) and is excellent in capacitance temperature characteristics (e.g. satisfies SL characteristics of JIS standard). <P>SOLUTION: The dielectric ceramic composition comprises: 50.47-55.48 wt.% SrTiO<SB>3</SB>; 14.30-21.36 wt.% CaTiO<SB>3</SB>; 16.70-19.40 wt.% Bi<SB>2</SB>O<SB>3</SB>; 8.29-10.01 wt.% TiO<SB>2</SB>; 0.24-0.50 wt.% CeO<SB>2</SB>; 0.027-0.347 wt.% CuO; and 0.16-0.46 wt.% Mn compound calculated in terms of MnO. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、誘電体磁器組成物に関し、さらに詳しくは、比較的高い比誘電率（たとえば、６００以上）を示すとともに、誘電損失が小さく（たとえば１００ＫＨｚにおいて０．３％以下）、容量温度特性に優れた（たとえば、ＪＩＳ規格のＳＬ特性を満足）誘電体磁器組成物に関する。また、本発明は、上記誘電体磁器組成物を用いた電子部品、特にセラミックコンデンサに関する。   The present invention relates to a dielectric ceramic composition. More specifically, the present invention shows a relatively high relative dielectric constant (for example, 600 or more), a small dielectric loss (for example, 0.3% or less at 100 KHz), and a capacitance-temperature characteristic. The present invention relates to an excellent dielectric ceramic composition (for example, satisfying JIS standard SL characteristics). The present invention also relates to an electronic component, particularly a ceramic capacitor, using the dielectric ceramic composition.

近年、急速に進む電気機器の高性能化に伴い、電気回路の小型化、複雑化もまた急速に進んでいる。そのため、電子部品もより一層の小型化、高性能化が求められている。すなわち、良好な温度特性を維持しつつ、小型化においても静電容量を維持するために、誘電率が高い誘電体磁器組成物及び電子部品が求められている。   In recent years, along with rapid progress in performance of electrical equipment, miniaturization and complexity of electrical circuits are also progressing rapidly. For this reason, electronic components are required to be further reduced in size and performance. That is, there is a demand for a dielectric ceramic composition and an electronic component having a high dielectric constant in order to maintain capacitance even in downsizing while maintaining good temperature characteristics.

セラミックコンデンサなどに用いられる誘電体磁器組成物としては、チタン酸バリウム（ＢａＴｉＯ３ ）などの高誘電率系が知られている。この種の組成物では、比誘電率εｒを高くできるが、容量温度変化率が大きい。 High dielectric constant systems such as barium titanate (BaTiO 3 ) are known as dielectric ceramic compositions used for ceramic capacitors and the like. In this type of composition, the relative dielectric constant εr can be increased, but the capacitance temperature change rate is large.

また、誘電体磁器組成物としては、ジルコン酸カルシウム（ＣａＺｒＯ３ ）、ジルコン酸ストロンチウム（ＳｒＺｒＯ３ ）、チタン酸カルシウム（ＣａＴｉＯ３ ）、チタン酸ストロンチウム（ＳｒＴｉＯ３ ）、ジルコン酸ストロンチウムカルシウム（ＣａＳｒＺｒＯ３ ）などの温度補償用も知られている。この主の組成物は、容量温度変化率が非常に小さく、カップリング回路、音響回路または画像処理回路などに用いることができる。しかしながら、常誘電体であるが故に、比誘電率εｒが３０〜２００と低く、高容量のコンデンサを得ることが困難である。 The dielectric ceramic composition includes calcium zirconate (CaZrO 3 ), strontium zirconate (SrZrO 3 ), calcium titanate (CaTiO 3 ), strontium titanate (SrTiO 3 ), and strontium calcium zirconate (CaSrZrO 3 ). It is also known for temperature compensation. This main composition has a very small capacity-temperature change rate, and can be used for a coupling circuit, an acoustic circuit, an image processing circuit, or the like. However, since it is a paraelectric material, the relative dielectric constant εr is as low as 30 to 200, and it is difficult to obtain a high-capacitance capacitor.

たとえば、特許文献１には、特定組成の（ＳｒＣａ）（ＴｉＺｒ）Ｏ３と、Ｌｉ２ＳｉＯ３およびアルカリ土類フッ化物からなる温度補償用磁器組成物が開示されている。 For example, Patent Document 1 discloses a temperature compensating porcelain composition comprising (SrCa) (TiZr) O 3 having a specific composition, Li 2 SiO 3 and an alkaline earth fluoride.

特開平５−１７２２２号公報JP-A-5-17222

しかし、上記特許文献１に記載の誘電体磁器組成物では、比誘電率εｒが最大でも３１０程度であり、小型化の上ではなお不十分であった。   However, the dielectric ceramic composition described in Patent Document 1 has a relative dielectric constant εr of about 310 at the maximum, which is still insufficient for downsizing.

本発明は、上記のような従来技術に鑑みてなされたものであって、比較的高い比誘電率（たとえば、６００以上）を示すとともに、誘電損失が小さく（たとえば１００ＫＨｚにおいて０．３％以下）、容量温度特性に優れた（たとえば、ＪＩＳ規格のＳＬ特性を満足）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 prior art as described above, and exhibits a relatively high relative dielectric constant (for example, 600 or more) and a small dielectric loss (for example, 0.3% or less at 100 KHz). An object of the present invention is to provide a dielectric ceramic composition having excellent capacity-temperature characteristics (for example, satisfying JIS standard SL characteristics).

上記課題を解決する本発明は、下記事項を要旨として含む。
（１）ＳｒＴｉＯ３：５０．４７〜５５．４８重量％、
ＣａＴｉＯ３：１４．３０〜２１．３６重量％、
Ｂｉ２Ｏ３：１６．７０〜１９．４０重量％、
ＴｉＯ２：８．２９〜１０．０１重量％、
ＣｅＯ２：０．２４〜０．５０重量％、
ＣｕＯ：０．０２７〜０．３４７重量％、および
Ｍｎ化合物をＭｎＯ換算で０．１６〜０．４６重量％の割合で含有する誘電体磁器組成物。 The present invention for solving the above-mentioned problems includes the following matters as a gist.
(1) SrTiO 3 : 50.47 to 55.48% by weight,
CaTiO 3 : 14.30 to 21.36% by weight,
Bi 2 O 3 : 16.70 to 19.40% by weight,
TiO 2 : 8.29 to 10.01% by weight,
CeO 2 : 0.24 to 0.50% by weight,
CuO: 0.027 to 0.347% by weight, and a dielectric ceramic composition containing a Mn compound at a ratio of 0.16 to 0.46% by weight in terms of MnO.

（２）さらに、Ｎｂ２Ｏ３を０．７５０重量％以下の割合で含有する（１）に記載の誘電体磁器組成物。 (2) The dielectric ceramic composition according to (1), further containing Nb 2 O 3 in a proportion of 0.750% by weight or less.

（３）上記（１）または（２）に記載の誘電体磁器組成物を用いた電子部品。 (3) An electronic component using the dielectric ceramic composition as described in (1) or (2) above.

（４）上記（１）または（２）に記載の誘電体磁器組成物を用いたリード付きコンデンサ。 (4) A leaded capacitor using the dielectric ceramic composition as described in (1) or (2) above.

本発明によれば、比較的高い比誘電率（たとえば、６００以上）を示すとともに、誘電損失が小さく（たとえば１００ＫＨｚにおいて０．３％以下）、容量温度特性に優れた（たとえば、ＪＩＳ規格のＳＬ特性を満足）誘電体磁器組成物が提供される。   According to the present invention, the dielectric constant is relatively high (for example, 600 or more), the dielectric loss is small (for example, 0.3% or less at 100 KHz), and the capacitance-temperature characteristics are excellent (for example, JIS standard SL) Satisfying properties) A dielectric porcelain composition is provided.

図１（Ａ）は本発明の一実施形態に係るセラミックコンデンサの正面図、図１（Ｂ）は本発明の一実施形態に係るセラミックコンデンサの側面断面図である。FIG. 1A is a front view of a ceramic capacitor according to an embodiment of the present invention, and FIG. 1B is a side sectional view of the ceramic capacitor according to an embodiment of the present invention.

以下、本発明を、図面に示す実施形態に基づき説明する。
図１（Ａ）は本発明の一実施形態に係るセラミックコンデンサの正面図、図１（Ｂ）は本発明の一実施形態に係るセラミックコンデンサの側面断面図である。 Hereinafter, the present invention will be described based on embodiments shown in the drawings.
FIG. 1A is a front view of a ceramic capacitor according to an embodiment of the present invention, and FIG. 1B is a side sectional view of the ceramic capacitor according to an embodiment of the present invention.

セラミックコンデンサ２
図１（Ａ）、図１（Ｂ）に示すように、本実施形態に係るセラミックコンデンサ２は、誘電体層１０と、その対向表面に形成された一対の端子電極１２，１４と、この端子電極１２，１４に、それぞれ接続されたリード端子６，８とを有する構成となっており、これらは保護樹脂４に覆われている。セラミックコンデンサ２の形状は、目的や用途に応じて適宜決定すればよいが、誘電体層１０が円盤形状となっている円盤型のコンデンサであることが好ましい。また、そのサイズは、目的や用途に応じて適宜決定すればよいが、通常、直径が５〜２０ｍｍ程度、好ましくは５〜１５ｍｍ程度である。 Ceramic capacitor 2
As shown in FIGS. 1A and 1B, a ceramic capacitor 2 according to this embodiment includes a dielectric layer 10, a pair of terminal electrodes 12 and 14 formed on the opposing surface thereof, and the terminals. The lead terminals 6 and 8 are respectively connected to the electrodes 12 and 14, and these are covered with the protective resin 4. The shape of the ceramic capacitor 2 may be appropriately determined according to the purpose and application, but is preferably a disk-type capacitor in which the dielectric layer 10 has a disk shape. The size may be appropriately determined according to the purpose and application, but the diameter is usually about 5 to 20 mm, preferably about 5 to 15 mm.

誘電体層１０
誘電体層１０は、本発明の誘電体磁器組成物を含有する。本発明の誘電体磁器組成物は、Ｓｒ、Ｃａ、ＴｉおよびＢｉを含む主成分と、Ｃｅ、ＣｕおよびＭｎを含む副成分とを含有し、また副成分にはＮｂが含まれていてもよい。 Dielectric layer 10
The dielectric layer 10 contains the dielectric ceramic composition of the present invention. The dielectric ceramic composition of the present invention contains a main component containing Sr, Ca, Ti and Bi and a subcomponent containing Ce, Cu and Mn, and the subcomponent may contain Nb. .

主成分を構成する各元素の配合量を、下記酸化物または複合酸化物換算量で示す。すなわち、本発明の誘電体磁器組成物において、ＳｒＴｉＯ３は、５０．４７〜５５．４８重量％、好ましくは５１．４４〜５５．０１重量％で含有され、
ＣａＴｉＯ３は、１４．３０〜２１．３６重量％、好ましくは１４．３９〜２１．２２重量％で含有され、
Ｂｉ２Ｏ３は、１６．７０〜１９．４０重量％、好ましくは１６．７８〜１９．３６重量％で含有され、
ＴｉＯ２は、８．２９〜１０．０１重量％、好ましくは８．３０〜１０．００重量％で含有されてなる。 The compounding amount of each element constituting the main component is shown by the following oxide or composite oxide equivalent amount. That is, in the dielectric ceramic composition of the present invention, SrTiO 3 is contained at 50.47 to 55.48% by weight, preferably 51.44 to 55.01% by weight,
CaTiO 3 is contained at 14.30 to 21.36 wt%, preferably 14.39 to 21.22 wt%,
Bi 2 O 3 is contained in an amount of 16.70 to 19.40% by weight, preferably 16.78 to 19.36% by weight,
TiO 2 is contained in an amount of 8.29 to 10.01% by weight, preferably 8.30 to 10.00% by weight.

副成分を構成する各元素の配合量を、下記酸化物換算量で示す。すなわち、ＣｅＯ２は、０．２４〜０．５０重量％で含有され、
ＣｕＯは、０．０２７〜０．３４７重量％で含有され、
さらに、Ｍｎ化合物は、ＭｎＯ換算で０．１６〜０．４６重量％で含有される。 The compounding quantity of each element which comprises a subcomponent is shown by the following oxide conversion amount. That is, CeO 2 is contained at 0.24 to 0.50% by weight,
CuO is contained at 0.027 to 0.347% by weight,
Further, the Mn compound is contained at 0.16 to 0.46% by weight in terms of MnO.

上記のような組成で主成分および副成分を含有する誘電体磁器組成物は、比較的高い比誘電率（たとえば、６００以上）を示すとともに、誘電損失が小さく（たとえば１００ＫＨｚにおいて０．３％以下）、容量温度特性に優れる（たとえば、ＪＩＳ規格のＳＬ特性を満足）。   A dielectric ceramic composition containing the main component and the subcomponent in the above composition exhibits a relatively high relative dielectric constant (for example, 600 or more) and a small dielectric loss (for example, 0.3% or less at 100 KHz). ) Excellent in capacity-temperature characteristics (for example, satisfying JIS standard SL characteristics).

また、本発明の誘電体磁器組成物は、必要に応じＮｂ２Ｏ３を０．７５０重量％以下の割合で含有していてもよい。Ｎｂ２Ｏ３を配合することで、ほぼ同じ組成の主成分および副成分を含有する場合であっても、さらに誘電損失を低減することができる。 Moreover, the dielectric ceramic composition of the present invention may contain Nb 2 O 3 in a proportion of 0.750% by weight or less as necessary. By blending Nb 2 O 3 , the dielectric loss can be further reduced even when the main component and the subcomponent having substantially the same composition are contained.

誘電体層１０の厚みは、特に限定されず、用途等に応じて適宜決定すれば良いが、好ましくは０．３〜２ｍｍである。誘電体層１０の厚みを、このような範囲とすることにより、中高圧用途に好適に用いることができる。また、本発明の誘電体磁器組成物によれば、誘電率が高いため、素子の小型化が可能になる。   The thickness of the dielectric layer 10 is not particularly limited, and may be appropriately determined according to the use or the like, but is preferably 0.3 to 2 mm. By setting the thickness of the dielectric layer 10 in such a range, it can be suitably used for medium to high pressure applications. In addition, according to the dielectric ceramic composition of the present invention, since the dielectric constant is high, the device can be miniaturized.

端子電極１２，１４
端子電極１２，１４は、導電材で構成される。端子電極１２，１４に用いられる導電材としては、たとえば、Ｃｕ、Ｃｕ合金、Ａｇ、Ａｇ合金、Ｉｎ−Ｇａ合金等が挙げられる。 Terminal electrodes 12, 14
The terminal electrodes 12 and 14 are made of a conductive material. Examples of the conductive material used for the terminal electrodes 12 and 14 include Cu, Cu alloy, Ag, Ag alloy, and In—Ga alloy.

セラミックコンデンサの製造方法
次に、本実施形態に係るセラミックコンデンサの製造方法について説明する。
まず、焼成後に図１に示す誘電体層１０を形成することとなる誘電体磁器組成物粉末を製造する。 Next, a method for manufacturing a ceramic capacitor according to this embodiment will be described.
First, a dielectric ceramic composition powder that will form the dielectric layer 10 shown in FIG. 1 after firing is manufactured.

まず、主成分の原料および各副成分の原料を所定量準備する。主成分の原料は、ＳｒＴｉＯ３、ＣａＴｉＯ３、Ｂｉ２Ｏ３およびＴｉＯ２であり、副成分の原料はＣｅＯ２、ＣｕＯおよびＭｎ化合物である。Ｍｎ化合物は、ＭｎＯが好ましいが、その他の酸化物、水酸化物、炭酸塩等であってもよい。また、副成分としてＮｂ２Ｏ３を添加してもよい。 First, a predetermined amount of raw materials for the main component and raw materials for each subcomponent are prepared. The main component materials are SrTiO 3 , CaTiO 3 , Bi 2 O 3 and TiO 2 , and the subcomponent materials are CeO 2 , CuO and Mn compounds. The Mn compound is preferably MnO, but may be other oxides, hydroxides, carbonates or the like. It may also be added Nb 2 O 3 as an auxiliary component.

また、主成分の原料は、固相法により製造してもよいし、水熱合成法や蓚酸塩法などの液相法により製造してもよいが、製造コストの面から、固相法により製造することが好ましい。   The main component raw material may be manufactured by a solid phase method or a liquid phase method such as a hydrothermal synthesis method or an oxalate method. It is preferable to manufacture.

次いで、主成分および副成分の原料を、上記した所定の組成となるように配合し、水を分散媒として７５重量％程度の濃度において、ボールミルなどを用いて、湿式混合する。   Next, the raw materials of the main component and the subcomponent are blended so as to have the above-mentioned predetermined composition, and wet mixed using a ball mill or the like at a concentration of about 75% by weight using water as a dispersion medium.

次いで、バインダ樹脂を添加して、さらに湿式混合を行い、スプレードライなどの汎用の方法により造粒し、得られた造粒物を、所定の大きさを有する円盤状に成形することにより、グリーン成形体とする。そして、得られたグリーン成形体を、焼成することにより、誘電体磁器組成物の焼結体を得る。なお、焼成の条件としては、特に限定されないが、保持温度が、好ましくは１１６０〜１２２０℃であり、焼成雰囲気を空気中とすることが好ましい。   Next, a binder resin is added, further wet-mixed, granulated by a general-purpose method such as spray drying, and the resulting granulated product is formed into a disk shape having a predetermined size, thereby forming a green A molded body. The obtained green molded body is fired to obtain a sintered body of the dielectric ceramic composition. In addition, although it does not specifically limit as conditions for baking, Preferably holding temperature is 1160-1220 degreeC and it is preferable to make a baking atmosphere into the air.

そして、得られた誘電体磁器組成物の焼結体の主表面に、端子電極を印刷し、必要に応じて焼き付けすることにより、端子電極１２，１４を形成する。その後、端子電極１２，１４に、ハンダ付等により、リード端子６，８を接合し、最後に、素子本体を保護樹脂４で覆うことにより、図１（Ａ）、図１（Ｂ）に示すような単板型セラミックコンデンサを得る。   And terminal electrodes 12 and 14 are formed by printing a terminal electrode on the main surface of the sintered body of the obtained dielectric ceramic composition, and baking it as necessary. Thereafter, the lead terminals 6 and 8 are joined to the terminal electrodes 12 and 14 by soldering or the like, and finally, the element main body is covered with the protective resin 4 so as to be shown in FIGS. 1 (A) and 1 (B). Such a single plate type ceramic capacitor is obtained.

このようにして製造された本発明のセラミックコンデンサは、リード端子６，８を介してプリント基板上などに実装され、各種電子機器等に使用される。   The ceramic capacitor of the present invention thus manufactured is mounted on a printed circuit board or the like via lead terminals 6 and 8, and is used for various electronic devices.

以上、本発明の実施形態について説明してきたが、本発明はこうした実施形態に何等限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々異なる態様で実施し得ることは勿論である。   As mentioned above, although embodiment of this invention was described, this invention is not limited to such embodiment at all, Of course, it can implement with a various aspect in the range which does not deviate from the summary of this invention. .

たとえば、上述した実施形態では、本発明に係る電子部品として誘電体層が単層である単板型セラミックコンデンサを例示したが、本発明に係る電子部品としては、単板型セラミックコンデンサに限定されず、上記した誘電体磁器組成物を含む誘電体ペーストおよび電極ペーストを用いた通常の印刷法やシート法により作製される積層型セラミックコンデンサであっても良い。   For example, in the embodiment described above, a single plate type ceramic capacitor having a single dielectric layer is exemplified as the electronic component according to the present invention. However, the electronic component according to the present invention is limited to the single plate type ceramic capacitor. Alternatively, it may be a multilayer ceramic capacitor produced by a normal printing method or sheet method using a dielectric paste and an electrode paste containing the above dielectric ceramic composition.

以下、本発明を、さらに詳細な実施例に基づき説明するが、本発明は、これら実施例に限定されない。   Hereinafter, although this invention is demonstrated based on a more detailed Example, this invention is not limited to these Examples.

実施例
まず、主成分原料としてＳｒＴｉＯ３、ＣａＴｉＯ３、Ｂｉ２Ｏ３およびＴｉＯ２を、副成分原料としてＣｅＯ２、ＣｕＯ、ＭｎＯおよびＮｂ２Ｏ３をそれぞれ準備した。準備した原料を、表１に示す重量組成となるように、それぞれ秤量し、分散媒として水を用い固形分７５重量％の濃度にて、ボールミルにより湿式混合した。 Example First, SrTiO 3 , CaTiO 3 , Bi 2 O 3 and TiO 2 were prepared as main component materials, and CeO 2 , CuO, MnO and Nb 2 O 3 were prepared as subcomponent materials. The prepared raw materials were each weighed so as to have the weight composition shown in Table 1, and wet-mixed by a ball mill at a concentration of 75 wt% solid content using water as a dispersion medium.

次いで、バインダーとしてポリビニルアルコール水溶液を、固形分濃度が１．９３重量％となるように添加、混合し、スプレードライにより造粒して、メッシュパスを通した後、得られた造粒粉を３ｔ／ｃｍ２の圧力で成形することにより、直径１２ｍｍ、厚さ約１.２ｍｍの円盤状のグリーン成形体を得た。 Next, an aqueous polyvinyl alcohol solution as a binder is added and mixed so that the solid content concentration becomes 1.93 wt%, granulated by spray drying, passed through a mesh pass, and the obtained granulated powder is 3 t. By molding at a pressure of / cm 2 , a disk-shaped green molded body having a diameter of 12 mm and a thickness of about 1.2 mm was obtained.

次いで、得られたグリーン成形体を、空気中、１１６０〜１２２０℃、２時間の条件で焼成することにより、円盤状の焼結体を得た。そして、得られた焼結体の主表面にＡｇ電極を塗布し、さらに空気中、６５０℃で２０分間焼付け処理を行うことによって、図１に示すような円盤状のセラミックコンデンサの試料を得た。得られたコンデンサ試料の誘電体層１０の厚みは約１ｍｍであった。そして、得られた各コンデンサ試料について、以下の方法により、比誘電率、誘電損失および容量温度特性をそれぞれ評価した。評価結果を表１に示す。   Next, the obtained green molded body was fired in air at 1160 to 1220 ° C. for 2 hours to obtain a disk-shaped sintered body. And the Ag electrode was apply | coated to the main surface of the obtained sintered compact, and also the sample of the disk-shaped ceramic capacitor as shown in FIG. 1 was obtained by performing the baking process in air at 650 degreeC for 20 minutes. . The thickness of the dielectric layer 10 of the obtained capacitor sample was about 1 mm. Each of the obtained capacitor samples was evaluated for dielectric constant, dielectric loss, and capacitance-temperature characteristics by the following methods. The evaluation results are shown in Table 1.

比誘電率εおよび誘電損失（ｔａｎδ）
円盤状試料について、２５℃において、ＬＣＲメータにより１ｋＨｚ、１Ｖｒｍｓの条件下における静電容量、誘電損失（ｔａｎδ）を測定した。得られた静電容量と、電極寸法および試料の厚みから比誘電率（εｒ）を算出した。 Dielectric constant ε and dielectric loss (tan δ)
The disc-shaped sample was measured for its capacitance and dielectric loss (tan δ) under the conditions of 1 kHz and 1 Vrms with an LCR meter at 25 ° C. The relative dielectric constant (εr) was calculated from the obtained capacitance, electrode dimensions, and sample thickness.

容量温度特性
円盤状試料をＬＣＲメータを用いて、１Ｖの電圧での静電容量を測定し、ＪＩＳ規格のＳＬ特性（基準温度を２０℃としたとき、８５℃での容量変化率）を測定した。 Capacitance-temperature characteristics Use a LCR meter to measure the capacitance at a voltage of 1 V, and measure the JIS standard SL characteristics (capacity change rate at 85 ° C when the reference temperature is 20 ° C). did.

以上の結果より、本発明において規定する組成で主成分および副成分を含有する誘電体磁器組成物は、比較的高い比誘電率（たとえば、６００以上）を示すとともに、誘電損失が小さく（たとえば１００ＫＨｚにおいて０．３％以下）、容量温度特性に優れる（たとえば、ＪＩＳ規格のＳＬ特性を満足）。一方、本発明で規定する範囲を外れる組成では、比誘電率、誘電損失あるいは容量温度特性が損なわれることがわかる。また、Ｎｂ２Ｏ３を配合することで、ほぼ同じ組成の主成分および副成分を含有する場合であっても、さらに誘電損失を低減することができるが、配合量が過剰であると、容量温度特性が損なわれることがわかる。 From the above results, the dielectric ceramic composition containing the main component and the subcomponent in the composition defined in the present invention exhibits a relatively high relative dielectric constant (for example, 600 or more) and a small dielectric loss (for example, 100 KHz). 0.3% or less) and excellent capacity-temperature characteristics (for example, satisfying SL characteristics of JIS standard). On the other hand, it can be seen that the composition outside the range defined by the present invention impairs the relative permittivity, dielectric loss, or capacitance-temperature characteristics. In addition, by blending Nb 2 O 3 , the dielectric loss can be further reduced even when the main component and the subcomponent having substantially the same composition are contained, but if the blending amount is excessive, the capacity It can be seen that the temperature characteristics are impaired.

２… セラミックコンデンサ
４… 保護樹脂
６，８… リード端子
１０… 誘電体層
１２，１４… 端子電極 2 ... Ceramic capacitor 4 ... Protective resin 6, 8 ... Lead terminal 10 ... Dielectric layer 12, 14 ... Terminal electrode

Claims (4)

  1. ＳｒＴｉＯ３：５０．４７〜５５．４８重量％、
    ＣａＴｉＯ３：１４．３０〜２１．３６重量％、
    Ｂｉ２Ｏ３：１６．７０〜１９．４０重量％、
    ＴｉＯ２：８．２９〜１０．０１重量％、
    ＣｅＯ２：０．２４〜０．５０重量％、
    ＣｕＯ：０．０２７〜０．３４７重量％、および
    Ｍｎ化合物をＭｎＯ換算で０．１６〜０．４６重量％の割合で含有する誘電体磁器組成物。     SrTiO 3 : 50.47 to 55.48% by weight,
    CaTiO 3 : 14.30 to 21.36% by weight,
    Bi 2 O 3 : 16.70 to 19.40% by weight,
    TiO 2 : 8.29 to 10.01% by weight,
    CeO 2 : 0.24 to 0.50% by weight,
    CuO: 0.027 to 0.347% by weight, and a dielectric ceramic composition containing a Mn compound at a ratio of 0.16 to 0.46% by weight in terms of MnO.
  2. さらに、Ｎｂ２Ｏ３を０．７５０重量％以下の割合で含有する請求項１に記載の誘電体磁器組成物。 Further, the dielectric ceramic composition of claim 1 containing Nb 2 O 3 in a proportion of 0.750 wt% or less.
  3. 請求項１または２に記載の誘電体磁器組成物を用いた電子部品。   An electronic component using the dielectric ceramic composition according to claim 1.
  4. 請求項１または２に記載の誘電体磁器組成物を用いたリード付きコンデンサ。   A leaded capacitor using the dielectric ceramic composition according to claim 1.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2016136772A1 (en) * 2015-02-27 2017-11-24 株式会社村田製作所 Variable capacitance element

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JPS5329599A (en) * 1976-08-30 1978-03-18 Taiyo Yuden Kk Dielectric ceramic composition
JPS62295304A (en) * 1986-06-14 1987-12-22 Murata Manufacturing Co Dielectric ceramic composition
JPH07201225A (en) * 1993-12-28 1995-08-04 Matsushita Electric Ind Co Ltd Dielectric porcelain composite
JP2004196650A (en) * 2002-12-03 2004-07-15 Murata Mfg Co Ltd Dielectric ceramic composition and ceramic electronic component

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Publication number Priority date Publication date Assignee Title
JPS5329599A (en) * 1976-08-30 1978-03-18 Taiyo Yuden Kk Dielectric ceramic composition
JPS62295304A (en) * 1986-06-14 1987-12-22 Murata Manufacturing Co Dielectric ceramic composition
JPH07201225A (en) * 1993-12-28 1995-08-04 Matsushita Electric Ind Co Ltd Dielectric porcelain composite
JP2004196650A (en) * 2002-12-03 2004-07-15 Murata Mfg Co Ltd Dielectric ceramic composition and ceramic electronic component

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2016136772A1 (en) * 2015-02-27 2017-11-24 株式会社村田製作所 Variable capacitance element
US10204742B2 (en) 2015-02-27 2019-02-12 Murata Manufacturing Co., Ltd. Variable capacitance element

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