JP2006169011A - Dielectric ceramic composition - Google Patents
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本発明は、例えば、積層セラミックコンデンサ用の誘電体材料等として用いられる誘電体磁器組成物に関するものである。 The present invention relates to a dielectric ceramic composition used as a dielectric material for a multilayer ceramic capacitor, for example.
従来、誘電体磁器組成物としては、例えば、チタン酸バリウム系組成物や鉛系複合ペロブスカイト系材料等の、強誘電体材料が用いられてきた。例えば、特許文献１には、チタン酸バリウム系の誘電体磁器組成物が、積層セラミックコンデンサ用の誘電体材料として広く用いられることが記載されていると共に、その改良として、特定の組成を有するＢａＴｉＯ3と、Ｌａ、Ｎｄ、Ｓｍ、Ｄｙ、Ｅｒのうち少なくとも１種の希土類酸化物とを所定の割合で含む主成分に、副成分として、ＭｎＯと、ＢａＯ−ＳｒＯ−Ｌｉ2Ｏ−ＳｉＯ2系の酸化物ガラスとを含有させた非還元性誘電体磁器組成物が提案されている。
Conventionally, ferroelectric materials such as barium titanate-based compositions and lead-based composite perovskite-based materials have been used as dielectric ceramic compositions. For example,
また、特許文献２には、チタン酸バリウム系以外の誘電体材料として、鉛系複合ペロブスカイト系材料が、積層セラミックコンデンサ用の誘電体材料として広く用いられることが記載されていると共に、その改良として、Ｐｂ（Ｍｇ1/2Ｗ1/2）Ｏ3と、ＰｂＴｉＯ3と、Ｐｂ（Ｎｉ1/3Ｎｂ2/3）Ｏ3とを所定の割合で含む誘電体材料が提案されている。
しかし、近年、地球規模での環境保護運動が高まりを見せている中で、環境への負荷が大きいＢａやＰｂを含まない、新たな誘電体磁器組成物の開発が望まれている。また、Ｂａ、Ｐｂ等を含む誘電体磁器組成物は、その製造に際して、環境保護への配慮から、製造工程で発生する廃液を処理する処理設備等の、特殊な設備を必要とするため、製造コストの面でも、これらの物質を含まない誘電体磁器組成物の開発が求められている。 However, in recent years, the global environmental protection movement is increasing, and development of a new dielectric ceramic composition that does not contain Ba or Pb, which has a large environmental load, is desired. In addition, the dielectric ceramic composition containing Ba, Pb, etc. is manufactured because special equipment such as processing equipment for treating the waste liquid generated in the manufacturing process is required in consideration of environmental protection. In terms of cost, development of dielectric ceramic compositions that do not contain these substances is required.
本発明の目的は、環境への負荷が大きい物質を含まず、しかも、誘電体材料として良好な誘電率特性を有する新規な誘電体磁器組成物を提供することにある。 An object of the present invention is to provide a novel dielectric ceramic composition which does not contain a substance having a large environmental load and has a good dielectric constant characteristic as a dielectric material.
上記課題を解決するため、発明者は、式(1)：
Ｃａ4-3yＣｕ3yＴｉ4Ｏ12 (1)
〔式中、ｙはｙ≦１である。〕
で表されるＣａとＣｕとＴｉの複酸化物について、各元素の組成比および結晶構造と、誘電率特性との関係について、解析を行った。
In order to solve the above problem, the inventor has the following formula (1):
Ca 4-3y Cu 3y Ti 4 O 12 (1)
[Wherein y is y ≦ 1. ]
For the double oxide of Ca, Cu, and Ti represented by the following formula, the relationship between the composition ratio and crystal structure of each element and the dielectric constant characteristics was analyzed.
その結果、上記複酸化物からなる結晶が、ＣａとＣｕとＴｉの複酸化物であるＣａＣｕ3Ｔｉ4Ｏ12からなる結晶相と、ＣａとＴｉの複酸化物であるＣａＴｉＯ3からなる結晶相とが混在した結晶構造を呈するとき、その複雑な結晶構造に起因してか、式(1)の複酸化物が、基本的に、積層セラミックコンデンサ等の通常の使用環境下において常誘電体であるにも拘らず、形成される誘電体磁器組成物は、チタン酸バリウム系組成物や鉛系複合ペロブスカイト系材料などの強誘電体と同等の、そして、ＣａＣｕ3Ｔｉ4Ｏ12とＣａＴｉＯ3とが互いに固溶した固溶体結晶の状態を呈するものでは得られない、良好な誘電率特性、すなわち、高い比誘電率ε′と低い誘電損失ｔａｎδとを実現し得ることを見出した。 As a result, the crystal composed of the double oxide is composed of a crystal phase composed of CaCu 3 Ti 4 O 12 which is a complex oxide of Ca, Cu and Ti, and a crystal phase composed of CaTiO 3 which is a complex oxide of Ca and Ti. The mixed oxide of formula (1) is basically a paraelectric material in a normal use environment such as a multilayer ceramic capacitor, because of the complicated crystal structure. Nevertheless, the dielectric ceramic composition formed is equivalent to ferroelectrics such as barium titanate-based compositions and lead-based composite perovskite-based materials, and CaCu 3 Ti 4 O 12 and CaTiO 3 It has been found that good dielectric constant characteristics, that is, a high relative dielectric constant ε ′ and a low dielectric loss tan δ, which cannot be obtained by presenting solid solution crystal states in a solid solution, can be realized.
なお、上記２種の結晶相が混在した結晶構造とは、結晶粒（グレイン）中で、ＣａＣｕ3Ｔｉ4Ｏ12とＣａＴｉＯ3とが固溶体結晶を形成せずに、ＣａＣｕ3Ｔｉ4Ｏ12の結晶構造が連続した領域（ＣａＣｕ3Ｔｉ4Ｏ12からなる結晶相）と、ＣａＴｉＯ3の結晶構造が連続した領域（ＣａＴｉＯ3からなる結晶相）とを混在させた状態を呈する結晶構造を示す。 In addition, the crystal structure in which the two kinds of crystal phases are mixed is that CaCu 3 Ti 4 O 12 and CaTiO 3 do not form a solid solution crystal in a crystal grain (grain), and CaCu 3 Ti 4 O 12 and the crystal structure is continuous area (CaCu 3 Ti 4 O of 12 crystal phase), showing the crystal structure exhibiting a state where the crystal structure of CaTiO 3 is a mix of a continuous area (crystalline phase consisting of CaTiO 3).
また、上記の誘電体磁器組成物は、Ｂａ、Ｐｂ等の、環境への負荷が大きい物質を含まないため、環境保護の流れに十分に対応できると共に、廃液の処理設備等を必要としないため、製造コストの低減の要求に十分に対応できることも明らかとなった。
したがって、請求項１記載の発明は、ＣａとＣｕとＴｉの複酸化物からなる誘電体磁器組成物であって、ＣａＣｕ3Ｔｉ4Ｏ12からなる結晶相と、ＣａＴｉＯ3からなる結晶相とが混在した結晶構造を有することを特徴とする誘電体磁器組成物である。
In addition, since the above dielectric ceramic composition does not contain a material having a large environmental load such as Ba and Pb, it can sufficiently cope with the flow of environmental protection and does not require a waste liquid treatment facility. It has also become clear that it can fully meet the demands for reducing manufacturing costs.
Therefore, the invention described in
また、発明者がさらに検討したところ、式(1)中のｙを０．３３≦ｙ≦０．９２とすれば、誘電体磁器組成物の誘電率特性を、さらに向上できることが判明した。したがって、請求項２記載の発明は、ＣａとＣｕとＴｉの複酸化物を、式(1)：
Ｃａ4-3yＣｕ3yＴｉ4Ｏ12 (1)
で表したとき、式中のｙが０．３３≦ｙ≦０．９２である請求項１記載の誘電体磁器組成物である。
Further, the inventors further studied and found that the dielectric constant characteristics of the dielectric ceramic composition can be further improved if y in the formula (1) is 0.33 ≦ y ≦ 0.92. Therefore, according to the second aspect of the present invention, a double oxide of Ca, Cu and Ti is represented by the formula (1):
Ca 4-3y Cu 3y Ti 4 O 12 (1)
The dielectric ceramic composition according to
本発明の誘電体磁器組成物は、前記のように、ＣａとＣｕとＴｉの複酸化物からなる誘電体磁器組成物であって、ＣａＣｕ3Ｔｉ4Ｏ12からなる結晶相と、ＣａＴｉＯ3からなる結晶相とが混在した結晶構造を有することを特徴とするものである。
式(1)：
Ｃａ4-3yＣｕ3yＴｉ4Ｏ12 (1)
で表されるＣａとＣｕとＴｉの複酸化物において、その結晶構造を、上述した２種の結晶相が混在した構造とするためには、式(1)中のｙをｙ≦０．９６の範囲内に調整すればよい。ｙが０．９６＜ｙ＜１である場合には、その結晶構造が、ＣａＣｕ3Ｔｉ4Ｏ12とＣａＴｉＯ3とが互いに固溶した固溶体結晶の状態を呈し、さらに、ｙ＝１である場合には、ＣａＣｕ3Ｔｉ4Ｏ12単体の結晶構造となるため、このいずれの場合にも、良好な誘電率特性が得られない。
As described above, the dielectric ceramic composition of the present invention is a dielectric ceramic composition composed of a double oxide of Ca, Cu, and Ti, comprising a crystal phase composed of CaCu 3 Ti 4 O 12 , and CaTiO 3. The crystal phase is characterized by having a mixed crystal phase.
Formula (1):
Ca 4-3y Cu 3y Ti 4 O 12 (1)
In the double oxide of Ca, Cu, and Ti represented by the following formula, in order to make the crystal structure a structure in which the two kinds of crystal phases are mixed, y in formula (1) is set to y ≦ 0.96. It may be adjusted within the range. When y is 0.96 <y <1, the crystal structure is in the form of a solid solution crystal in which CaCu 3 Ti 4 O 12 and CaTiO 3 are in solid solution with each other, and y = 1 In this case, since the crystal structure of CaCu 3 Ti 4 O 12 is simple, good dielectric constant characteristics cannot be obtained in either case.
式(1)中のｙをｙ≦０．９６の範囲内に調整するためには、例えばＣａＣＯ3等の、Ｃａを含む化合物の粉末と、ＣｕＯ等の、Ｃｕを含む化合物の粉末と、ＴｉＯ2等の、Ｔｉを含む化合物の粉末とを出発原料として、仮焼、成形、焼成等の各工程を経て誘電体磁器組成物を製造する際に、上記各粉末の配合割合を調整すればよい。
これにより、製造される本発明の誘電体磁器組成物は、チタン酸バリウム系組成物や鉛系複合ペロブスカイト系材料などの強誘電体と同等の、良好な誘電率特性、すなわち、高い比誘電率ε′と低い誘電損失ｔａｎδとを有するものとなる。また、本発明の誘電体磁器組成物は、積層セラミックコンデンサ等の通常の使用環境下で常誘電体であるため、圧電現象によるノイズの発生を防止することができると共に、誘電率が時間と共に減少する割合が小さいため、良好なエージング特性を有するという利点もある。
In order to adjust y in the formula (1) within the range of y ≦ 0.96, for example, a powder of a compound containing Ca, such as CaCO 3 , a powder of a compound containing Cu, such as CuO, and TiO When a dielectric ceramic composition is manufactured through steps such as calcination, molding, firing, etc., using a powder of a compound containing Ti as 2 as a starting material, the blending ratio of each of the above powders may be adjusted. .
As a result, the dielectric ceramic composition of the present invention produced has good dielectric constant characteristics equivalent to ferroelectrics such as a barium titanate composition and a lead-based composite perovskite material, that is, a high relative dielectric constant. It has ε ′ and a low dielectric loss tan δ. In addition, since the dielectric ceramic composition of the present invention is a paraelectric material under a normal use environment such as a multilayer ceramic capacitor, it can prevent the generation of noise due to the piezoelectric phenomenon and the dielectric constant decreases with time. Since the ratio to do is small, there also exists an advantage that it has a favorable aging characteristic.
なお、本発明の誘電体磁器組成物の誘電率特性をさらに向上するためには、式(1)中のｙが０．３３≦ｙ≦０．９２の範囲内、特に０．５≦ｙ≦０．８の範囲内となるように、原料としての各化合物の粉末の配合割合を調整するのが好ましい。ｙが上記の範囲未満では、比誘電率ε′が低くなりすぎ、逆に、上記の範囲を超える場合には、誘電損失ｔａｎδが高くなりすぎるため、このいずれの場合にも、誘電率特性が低下するおそれがある。これに対し、式(1)中のｙを上記の範囲内とすれば、比誘電率ε′をできるだけ高くすると共に、誘電損失ｔａｎδをできるだけ低くして、より一層、良好な誘電率特性を得ることが可能となる。 In order to further improve the dielectric constant characteristics of the dielectric ceramic composition of the present invention, y in the formula (1) is within the range of 0.33 ≦ y ≦ 0.92, particularly 0.5 ≦ y ≦. It is preferable to adjust the blending ratio of the powder of each compound as a raw material so as to be within the range of 0.8. If y is less than the above range, the relative dielectric constant ε ′ becomes too low. Conversely, if y exceeds the above range, the dielectric loss tan δ becomes too high. May decrease. On the other hand, if y in the formula (1) is within the above range, the relative dielectric constant ε ′ is made as high as possible and the dielectric loss tan δ is made as low as possible to obtain even better dielectric constant characteristics. It becomes possible.
本発明の誘電体磁器組成物は、前記のように、Ｃａ、ＣｕおよびＴｉを含む化合物の粉末を所定の配合割合で混合し、次いで、得られた混合粉末を、例えば、大気中で、９００〜１１００℃程度の温度で仮焼し、得られた仮焼物を、ポリビニルブチラール、ポリビニルアルコール等のバインダ樹脂と混合して、所定の形状に成形した後、得られた成形物を、例えば、大気中で、９００〜１１００℃の温度で焼成することによって製造される。 As described above, in the dielectric ceramic composition of the present invention, the powder of the compound containing Ca, Cu and Ti is mixed at a predetermined blending ratio, and then the obtained mixed powder is mixed with, for example, 900 in the atmosphere. After calcining at a temperature of about ˜1100 ° C., the obtained calcined product is mixed with a binder resin such as polyvinyl butyral and polyvinyl alcohol, and molded into a predetermined shape. It is manufactured by baking at a temperature of 900 to 1100 ° C.
本発明の誘電体磁器組成物を積層セラミックコンデンサに適用する場合には、上記仮焼物を、バインダ樹脂と共に有機溶媒に混合して誘電体層用のペーストを調製し、このペーストを、内部電極層のもとになるペーストと交互に印刷して積層するか、または、仮焼物を、バインダ樹脂と混合してシート（セラミックグリーンシート）を形成し、このシートと、内部電極層のもとになるペーストとを交互に積層した後、積層物を同時に焼成すればよい。焼成後、端子電極を接続することで、誘電体層と内部電極層とが交互に積層された積層セラミックコンデンサが製造される。 When the dielectric ceramic composition of the present invention is applied to a multilayer ceramic capacitor, the calcined product is mixed with an organic solvent together with a binder resin to prepare a dielectric layer paste, which is used as an internal electrode layer. It is printed and laminated alternately with the base paste, or the calcined material is mixed with a binder resin to form a sheet (ceramic green sheet), which becomes the basis of this sheet and the internal electrode layer After alternately laminating the paste, the laminate may be fired simultaneously. After firing, a terminal electrode is connected to manufacture a multilayer ceramic capacitor in which dielectric layers and internal electrode layers are alternately stacked.
なお、本発明の誘電体磁器組成物は、上記積層セラミックコンデンサ以外にも、例えば、ＬＣフィルタ、カプラ、モジュール部品用基板等にも適用することができる。
本発明の誘電体磁器組成物には、前記２種の結晶相が混在した構造が形成されるのを阻害したり、それによって誘電率特性を低下させたりしない範囲で、各種金属の酸化物、複酸化物等の副成分を含有させることもできる。そのような副成分としては、例えば、ＳｒＴｉＯ3、ＴｉＯ2、ＭｇＴｉＯ3、Ｌａ2Ｏ3、Ｂｉ2Ｏ3等が挙げられる。
In addition, the dielectric ceramic composition of the present invention can be applied to, for example, LC filters, couplers, module component substrates, etc. in addition to the multilayer ceramic capacitor.
In the dielectric ceramic composition of the present invention, various metal oxides may be used as long as the structure in which the two kinds of crystal phases are mixed is not obstructed or the dielectric constant characteristics are not lowered thereby. Subcomponents such as double oxides can also be included. Examples of such subcomponents include SrTiO 3 , TiO 2 , MgTiO 3 , La 2 O 3 , Bi 2 O 3 and the like.
以下に、本発明を、実施例に基づいて説明するが、本発明の構成は、これらの実施例に限定されるものではない。
実施例１（結晶構造の解析）：
ＣａＣＯ3、ＣｕＯおよびＴｉＯ2の粉末（いずれも純度９９．９％以上）を、焼成後の誘電体磁器組成物における、式(1)中のｙがｙ＝１またはｙ＝０．６７となるように配合割合を調整した状態で配合し、乳鉢を用いて混合して２種の混合粉末を作製した。
Hereinafter, the present invention will be described based on examples, but the configuration of the present invention is not limited to these examples.
Example 1 (Analysis of crystal structure):
In a dielectric ceramic composition after firing a powder of CaCO 3 , CuO and TiO 2 (all having a purity of 99.9% or more), y in formula (1) becomes y = 1 or y = 0.67. Thus, the mixture was blended with the blending ratio adjusted, and mixed using a mortar to prepare two kinds of mixed powders.
次に、この２種の混合粉末を、それぞれ別個に、大気中で、１０５０℃×１２時間、仮焼して仮焼物を得、この仮焼物を乳鉢ですりつぶすと共に、ポリビニルブチラールを加えて混合して造粒粉末を作製した後、この造粒粉末を、直径１０ｍｍφの円板状の成形体を得るための金型内に充てんし、円板の厚み方向に５０ＭＰａの圧をかけて圧縮成形して、直径１０ｍｍφの円板状の成形体を作製した。そして、得られた成形体を、大気中で、１０９０℃×２４時間、焼成して円板状の誘電体磁器組成物を製造した。 Next, the two kinds of mixed powders are separately calcined in the atmosphere at 1050 ° C. for 12 hours to obtain a calcined product, and this calcined product is ground in a mortar and polyvinyl butyral is added and mixed. After the granulated powder is prepared, the granulated powder is filled in a mold for obtaining a disk-shaped molded body having a diameter of 10 mmφ, and compression-molded by applying a pressure of 50 MPa in the thickness direction of the disk. Thus, a disk-shaped molded body having a diameter of 10 mmφ was produced. And the obtained molded object was baked in air | atmosphere for 1090 degreeC * 24 hours, and manufactured the disk-shaped dielectric ceramic composition.
製造した誘電体磁器組成物について、ＣｕＫαをＸ線源として、回折計を用いて、測定範囲２θ＝２０〜１００°の条件で、Ｘ線回折測定を行った。測定結果としての回折スペクトルを図１に示す。
図１のうち、上段は、式(1)中のｙがｙ＝１である、式(1-1)：
ＣａＣｕ3Ｔｉ4Ｏ12 (1-1)
で表される誘電体磁器組成物の回折スペクトルを示す。図の回折スペクトル中に現れている各ピーク（符号Ａを付している、Ａの後のカッコ内は、そのピークが示す結晶面方位を表している）は、いずれもＣａＣｕ3Ｔｉ4Ｏ12に由来するものである。したがって、このものは、先に説明したように、ＣａＣｕ3Ｔｉ4Ｏ12単体の結晶構造を呈することがわかる。
The produced dielectric ceramic composition was subjected to X-ray diffraction measurement using CuKα as an X-ray source and using a diffractometer in a measurement range of 2θ = 20 to 100 °. A diffraction spectrum as a measurement result is shown in FIG.
In FIG. 1, the upper row shows the formula (1-1) in which y in the formula (1) is y = 1:
CaCu 3 Ti 4 O 12 (1-1)
The diffraction spectrum of the dielectric ceramic composition represented by Each peak appearing in the diffraction spectrum of the figure (labeled A, the parenthesis after A represents the crystal plane orientation indicated by the peak) is all CaCu 3 Ti 4 O 12. It is derived from. Therefore, as described above, it can be seen that this exhibits a crystal structure of CaCu 3 Ti 4 O 12 alone.
一方、図１の下段は、ｙがｙ＝０．６７である、式(1-2)：
Ｃａ2Ｃｕ2Ｔｉ4Ｏ12 (1-2)
で表される誘電体磁器組成物の回折スペクトルを示す。このものは、上段の回折スペクトル中に現れているＡのピークが全て現れていると共に、ＣａＴｉＯ3に由来する、図中に符号Ｂを付したピーク（Ｂの後のカッコ内は、前記と同様に、そのピークが示す結晶面方位を表している）が現れている。しかし、ＣａＣｕ3Ｔｉ4Ｏ12とＣａＴｉＯ3とが固溶した固溶体結晶に由来するピークは現れていない。これらのことから、式(1)中のｙがｙ≦０．９６であれば、その結晶構造を、ＣａＣｕ3Ｔｉ4Ｏ12からなる結晶相と、ＣａＴｉＯ3からなる結晶相とが混在した結晶構造にできることが判った。
On the other hand, in the lower part of FIG. 1, y is y = 0.67, formula (1-2):
Ca 2 Cu 2 Ti 4 O 12 (1-2)
The diffraction spectrum of the dielectric ceramic composition represented by In this sample, all peaks of A appearing in the upper diffraction spectrum appear, and peaks derived from CaTiO 3 and denoted by B in the figure (the parentheses after B are the same as above) Represents the crystal plane orientation indicated by the peak). However, a peak derived from a solid solution crystal in which CaCu 3 Ti 4 O 12 and CaTiO 3 are dissolved does not appear. Therefore, if y in the formula (1) is y ≦ 0.96, the crystal structure is a crystal in which a crystal phase composed of CaCu 3 Ti 4 O 12 and a crystal phase composed of CaTiO 3 are mixed. It turns out that it can be structured.
実施例２（組成比と誘電率特性との関係の検討）：
ＣａＣＯ3、ＣｕＯおよびＴｉＯ2の粉末（いずれも純度９９．９％以上）を、焼成後の誘電体磁器組成物における、式(1)中のｙが、図２中にプロットされた各点に対応する値となるように配合割合を調整した状態で配合し、乳鉢を用いて混合して１１種の混合粉末を作製し、この１１種の混合粉末を用いて、それぞれ実施例１と同様にして、円板状の誘電体磁器組成物を製造した。
Example 2 (Examination of relationship between composition ratio and dielectric constant characteristics):
CaCO 3 , CuO, and TiO 2 powders (all having a purity of 99.9% or more), and y in the expression (1) in the dielectric ceramic composition after firing are plotted at each point plotted in FIG. It mixes in the state which adjusted the mixture ratio so that it may become a corresponding value, mixes using a mortar, produces 11 types of mixed powders, and uses each of these 11 types of mixed powders similarly to Example 1. Thus, a disk-shaped dielectric ceramic composition was manufactured.
そして、製造した円板状の誘電体磁器組成物の両面に、それぞれＡｇペースト〔デュポン(株)製の４９２２Ｎ〕を塗布し、乾燥させて電極を形成した後、液体ヘリウムクライオスタット中にセットして、その温度を３００Ｋに維持しながら、ＬＣＲメータ〔アジレント・テクノロジーズ・インク社製の４２８４ＡプレシジョンＬＣＲメータ〕を用いて、ＡＣ４端子法によって測定した結果から、平行板コンデンサとしてみなした際の、比誘電率ε′と誘電損失ｔａｎδとを算出して、誘電率特性を評価した。測定周波数は１００ｋＨｚとした。結果を、図２に示す。 Then, an Ag paste (4922N manufactured by DuPont Co., Ltd.) was applied to both sides of the manufactured disc-shaped dielectric ceramic composition, dried to form electrodes, and then set in a liquid helium cryostat. , While maintaining the temperature at 300 K, using a LCR meter (4284A Precision LCR meter manufactured by Agilent Technologies, Inc.), measured by the AC4 terminal method, the relative dielectric when considered as a parallel plate capacitor The dielectric constant characteristics were evaluated by calculating the rate ε ′ and the dielectric loss tan δ. The measurement frequency was 100 kHz. The results are shown in FIG.
図より、ｙの値を大きくするほど、比誘電率ε′を高くできるものの、誘電損失ｔａｎδも高くなり、逆に、ｙの値を小さくするほど、誘電損失ｔａｎδを低くできるものの、比誘電率ε′も低くなる傾向にあることがわかった。また、ｙを０．３３≦ｙ≦０．９２の範囲内にすれば、比誘電率ε′を５００以上、誘電損失ｔａｎδを０．１（１０％）以下の範囲内に維持して、さらに良好な誘電率特性が得られること、ｙを０．５≦ｙ≦０．８の範囲内にすれば、比誘電率ε′を１０００以上、誘電損失ｔａｎδを０．０８（８％）以下に維持して、より一層、良好な誘電率特性が得られることが確認された。 As can be seen from the figure, the larger the value of y, the higher the relative dielectric constant ε ′, but the higher the dielectric loss tan δ. Conversely, the smaller the value of y, the lower the dielectric loss tan δ, but the relative dielectric constant. It was found that ε ′ also tends to be low. Further, if y is in the range of 0.33 ≦ y ≦ 0.92, the relative dielectric constant ε ′ is maintained in the range of 500 or more and the dielectric loss tan δ in the range of 0.1 (10%) or less If good dielectric constant characteristics can be obtained, and y is in the range of 0.5 ≦ y ≦ 0.8, the relative dielectric constant ε ′ is 1000 or more and the dielectric loss tan δ is 0.08 (8%) or less. It was confirmed that better dielectric constant characteristics can be obtained while maintaining the above.
実施例３（誘電率特性の温度、および周波数依存性の検討）：
ＣａＣＯ3、ＣｕＯおよびＴｉＯ2の粉末（いずれも純度９９．９９％）を、焼成後の誘電体磁器組成物における、式(1)中のｙが、ｙ＝０．６７となるように配合割合を調整した状態で配合し、乳鉢を用いて混合して混合粉末を作製し、この混合粉末を用いて、実施例１と同様にして、円板状の誘電体磁器組成物を製造した。
Example 3 (Examination of temperature and frequency dependence of dielectric constant characteristics):
Mixing ratio of CaCO 3 , CuO and TiO 2 powders (all with a purity of 99.99%) so that y in the formula (1) in the dielectric ceramic composition after firing becomes y = 0.67 Were mixed using a mortar and mixed to prepare a mixed powder. Using this mixed powder, a disk-shaped dielectric ceramic composition was produced in the same manner as in Example 1.
そして、製造した円板状の誘電体磁器組成物の両面に、それぞれＡｇペースト〔デュポン(株)製の４９２２Ｎ〕を塗布し、乾燥させて電極を形成した後、液体ヘリウムクライオスタット中にセットして、その温度を４．２〜３００Ｋの間で変化させながら、ＬＣＲメータ〔アジレント・テクノロジーズ・インク社製の４２８４ＡプレシジョンＬＣＲメータ〕を用いて、ＡＣ４端子法によって測定した結果から、平行板コンデンサとしてみなした際の、比誘電率ε′と誘電損失ｔａｎδとを算出して、誘電率特性を評価した。測定周波数は１００Ｈｚ、１ｋＨｚ、１０ｋＨｚ、１００ｋＨｚ、および１ＭＨｚとした。結果を、図３に示す。 Then, an Ag paste (4922N manufactured by DuPont Co., Ltd.) was applied to both sides of the manufactured disc-shaped dielectric ceramic composition, dried to form electrodes, and then set in a liquid helium cryostat. From the result measured by the AC4 terminal method using an LCR meter (4284A Precision LCR meter manufactured by Agilent Technologies, Inc.) while changing the temperature between 4.2 and 300 K, it is regarded as a parallel plate capacitor. The relative dielectric constant ε ′ and the dielectric loss tan δ were calculated, and the dielectric constant characteristics were evaluated. The measurement frequency was 100 Hz, 1 kHz, 10 kHz, 100 kHz, and 1 MHz. The results are shown in FIG.
図より、式(1)中のｙをｙ＝０．６７とした誘電体磁器組成物は、特に、２００〜３００Ｋ（−７３〜２７℃）という、積層セラミックコンデンサ等の通常の使用環境下で、また、１００Ｈｚ〜１００ｋＨｚという広い周波数範囲で、１８００以上という高い比誘電率ε′と、０．１以下という低い誘電損失ｔａｎδとを示すと共に、これらの値が温度によって殆ど変化しない、安定した誘電率特性を示すことがわかった。また、温度２１８〜３００Ｋ（−５５〜２７℃）、周波数１ｋＨｚでの、温度変化による比誘電率の変化量は＋１.０％であり、アメリカ電子機械工業会（ＥＩＡ）規格におけるＸ５Ｒ特性、およびＸ７Ｒ特性のうち、室温における特性を満足することも確認された。 From the figure, the dielectric ceramic composition in which y in the formula (1) is y = 0.67 is particularly in a normal use environment such as a multilayer ceramic capacitor of 200 to 300 K (−73 to 27 ° C.). In addition, in a wide frequency range of 100 Hz to 100 kHz, a high dielectric constant ε ′ of 1800 or more and a low dielectric loss tan δ of 0.1 or less and stable dielectrics whose values hardly change with temperature. It was found to show rate characteristics. In addition, the change in relative dielectric constant due to temperature change at a temperature of 218 to 300 K (−55 to 27 ° C.) and a frequency of 1 kHz is + 1.0%, and the X5R characteristics in the American Electronic Machinery Association (EIA) standard, and Of the X7R characteristics, it was also confirmed that the characteristics at room temperature were satisfied.
Claims (2)
Ｃａ4-3yＣｕ3yＴｉ4Ｏ12 (1)
で表したとき、式中のｙが０．３３≦ｙ≦０．９２である請求項１記載の誘電体磁器組成物。
A double oxide of Ca, Cu and Ti is expressed by the formula (1):
Ca 4-3y Cu 3y Ti 4 O 12 (1)
The dielectric ceramic composition according to claim 1, wherein y in the formula is 0.33 ≦ y ≦ 0.92.
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| JP2008143758A (en) * | 2006-12-13 | 2008-06-26 | Sumitomo Chemical Co Ltd | Dielectric material |
| WO2008136461A1 (en) * | 2007-04-27 | 2008-11-13 | Nec Corporation | Wide band capacity element |
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| CN102432062A (en) * | 2011-09-26 | 2012-05-02 | 常州大学 | Preparation method of perovskite-like varistor ceramic material CaCu3Ti4O12 with high dielectric constant |
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| JP2008143758A (en) * | 2006-12-13 | 2008-06-26 | Sumitomo Chemical Co Ltd | Dielectric material |
| JP2010514210A (en) * | 2006-12-21 | 2010-04-30 | カーディアック ペースメイカーズ， インコーポレイテッド | Solid State Pulse Therapy Capacitor |
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| CN102432062A (en) * | 2011-09-26 | 2012-05-02 | 常州大学 | Preparation method of perovskite-like varistor ceramic material CaCu3Ti4O12 with high dielectric constant |
| CN103933990A (en) * | 2014-04-12 | 2014-07-23 | 中国科学院新疆理化技术研究所 | Preparation method of CaCu3Ti4O12 in icoshexahedron structure |
| CN106699166A (en) * | 2016-12-07 | 2017-05-24 | 西安理工大学 | Lithium-sodium codoped giant dielectric ceramic and preparation method thereof |
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