KR19990057465A - Ceramic dielectric - Google Patents

Ceramic dielectric Download PDF

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Publication number
KR19990057465A
KR19990057465A KR1019970077517A KR19970077517A KR19990057465A KR 19990057465 A KR19990057465 A KR 19990057465A KR 1019970077517 A KR1019970077517 A KR 1019970077517A KR 19970077517 A KR19970077517 A KR 19970077517A KR 19990057465 A KR19990057465 A KR 19990057465A
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solid solution
dielectric constant
ceramic dielectric
barium titanate
titanate
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KR1019970077517A
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Korean (ko)
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KR100251146B1 (en
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이정형
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왕중일
대우전자부품 주식회사
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/002—Details
    • H01G4/018—Dielectrics
    • H01G4/06—Solid dielectrics
    • H01G4/08—Inorganic dielectrics
    • H01G4/12—Ceramic dielectrics
    • H01G4/1209—Ceramic dielectrics characterised by the ceramic dielectric material
    • H01G4/1218—Ceramic dielectrics characterised by the ceramic dielectric material based on titanium oxides or titanates
    • H01G4/1227—Ceramic dielectrics characterised by the ceramic dielectric material based on titanium oxides or titanates based on alkaline earth titanates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/46—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates
    • C04B35/462—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates
    • C04B35/465—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates based on alkaline earth metal titanates
    • C04B35/468—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates based on alkaline earth metal titanates based on barium titanates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/46—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates
    • C04B35/462—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates
    • C04B35/472—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates based on lead titanates

Abstract

본 발명은 세라믹 유전체에 관한 것이며, 티탄산바륨(BaTiO3)과 티탄산납(PbTiO3)을 주성분으로 하는 (BaxPb1-x)TiO3고용체로 이루어지며 상기 χ는 0보다 크고 1보다 작은 값을 가지는 것을 특징으로 하는 세라믹 유전체가 제공되고, 이로써 고용체의 티탄산바륨(BaTiO3)과 티탄산납(PbTiO3)의 함량을 적절히 조절하므로써 넓은 온도 범위에 걸쳐서 높은 유전율을 나타내는 세라믹 유전체를 제공할 수 있는 효과가 있다.The present invention relates to a ceramic dielectric, consisting of (Ba x Pb 1-x ) TiO 3 solid solution mainly composed of barium titanate (BaTiO 3 ) and lead titanate (PbTiO 3 ), wherein χ is greater than 0 and less than 1 There is provided a ceramic dielectric, characterized in that it can provide a ceramic dielectric exhibiting a high dielectric constant over a wide temperature range by appropriately adjusting the content of barium titanate (BaTiO 3 ) and lead titanate (PbTiO 3 ) of the solid solution It works.

Description

세라믹 유전체Ceramic dielectric

(기술분야)(Technology)

본 발명은 세라믹 유전체에 관한 것이며, 보다 상세하게는 티탄산바륨(BaTiO3)과 티탄산납(PbTiO3)을 주성분으로 하는 고용체로 이루어진 세라믹 유전체에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic dielectric, and more particularly to a ceramic dielectric composed of a solid solution composed mainly of barium titanate (BaTiO 3 ) and lead titanate (PbTiO 3 ).

(배경기술)(Background)

높은 온도로 처리된 무기질의 비금속 재료라고 정의할 수 있는 세라믹 재료는, 최초에 규소나 알루미늄 등의 산화물을 주성분으로 하는 단일 화합물 또는 복합 화합물인 여러 종류의 알루미늄규산염이 그 모체였으나, 최근에는 매우 광범위한 화합물로 그 대상이 확대되고 있다.Ceramic materials, which can be defined as inorganic nonmetallic materials treated at high temperatures, were initially composed of various kinds of aluminum silicates, which are single compounds or complex compounds mainly composed of oxides such as silicon and aluminum, but have recently been widely used. The compound is expanding its object.

세라믹의 특성에 따른 그 적용용도는 매우 다양하지만, 그 중에서 높은 유전성을 가지는 유전체 세라믹은 콘덴서 등에 널리 응용되고 있으며, 유전체 세라믹의 대표적인 예로서는 티탄산바륨(BaTiO3)을 들 수 있다.The application of the ceramics varies widely, but among them, dielectric ceramics having high dielectric properties are widely used in capacitors and the like, and barium titanate (BaTiO 3 ) is a typical example of the dielectric ceramics.

도1은 티탄산바륨(BaTiO3)에 대한 유전율의 온도 특성을 개략적으로 보여주는 그래프이다. 티탄산바륨은, 도1에 도시된 바와 같이, 상온에서는 1600, 120℃부근의 큐리온도(Tc)에서는 10,000 내외의 커다란 유전율을 나타내는 강유전체로서, 유전 손실과 온도 특성, 및 전압 의존성을 아주 적다. 기존의 재료에 비하여 20-200배 큰 티탄산바륨의 유전율로 인하여 소형 대용량의 콘덴서가 가능하게 되었다.1 is a graph schematically showing the temperature characteristic of dielectric constant for barium titanate (BaTiO 3 ). As shown in Fig. 1, barium titanate is a ferroelectric material having a large dielectric constant of around 10,000 at a Curie temperature (Tc) of around 1600 and 120 ° C at room temperature, and has very little dielectric loss, temperature characteristics, and voltage dependence. Due to the dielectric constant of barium titanate 20-200 times larger than conventional materials, it is possible to make a small-capacity capacitor.

상온에서의 티탄산바륨의 유전율을 높이기 위해, 큐리온도(Tc)를 상온 쪽으로 이동시키는 성분(shifter)을 첨가해서 고용체를 형성하는 기술이 개발되어 있다. 이런 쉬프터로서는 BaZrO3, CaZrO3, SrTiO3, PbTiO3등이 사용되고 있다.In order to increase the dielectric constant of barium titanate at room temperature, a technique for forming a solid solution by adding a shifter for shifting the Curie temperature (Tc) to room temperature has been developed. Examples of such a shifter has been used, etc. BaZrO 3, CaZrO 3, SrTiO 3 , PbTiO 3.

티탄산납(PbTiO3)은, 티탄산바륨과 마찬가지로 페로브스카이드(perovskite)형의 결정 구조를 가지며 티탄산바륨의 결정구조에서 Ba가 Pb로 치환된 것과 동일한 구조를 가진다.Lead titanate (PbTiO 3 ), like barium titanate, has a perovskite crystal structure and has the same structure as Ba is substituted with Pb in the crystal structure of barium titanate.

도2는 티탄산납(PbTiO3)에 대한 유전율의 온도 특성을 개략적으로 보여주는 그래프. 도2에 도시된 바와 같이, 티탄산납의 큐리온도(Tc)는 500℃의 부근이다.2 is a graph schematically showing the temperature characteristic of dielectric constant for lead titanate (PbTiO 3 ). As shown in Fig. 2, the Curie temperature (Tc) of lead titanate is around 500 deg.

도1과 도2로부터 알 수 있는 바와 같이, 티탄산바륨과 티탄산납은 각각 120℃와 500℃의 큐리온도(Tc)를 가지고 있는 바, 이들 각각을 재료로 하는 유전체는 상기 큐리온도(Tc) 부근을 제외하고 낮은 유전율을 보이고 있는 바, 넓은 온도 범위에 걸쳐서 평탄하게 높은 유전율을 나타내는 세라믹 유전체가 필요시 되고 있다.As can be seen from Figs. 1 and 2, barium titanate and lead titanate have Curie temperatures Tc of 120 DEG C and 500 DEG C, respectively. Except for the low dielectric constant, there is a need for a ceramic dielectric having a relatively high dielectric constant over a wide temperature range.

본 발명의 목적은 넓은 온도 범위에 걸쳐서 평탄하고 높은 유전율을 나타내는 세라믹 유전체를 제공하고자 하는 것이다.It is an object of the present invention to provide a ceramic dielectric that is flat and exhibits high permittivity over a wide temperature range.

도1은 티탄산바륨(BaTiO3)에 대한 유전율의 온도 특성을 개략적으로 보여주는 그래프.1 is a graph schematically showing the temperature characteristic of dielectric constant for barium titanate (BaTiO 3 ).

도2는 티탄산납(PbTiO3)에 대한 유전율의 온도 특성을 개략적으로 보여주는 그래프.2 is a graph schematically showing the temperature characteristic of dielectric constant for lead titanate (PbTiO 3 ).

도 3은 (BaxPb1-x)TiO3고용체에 대한 유전율의 온도 특성을 개략적으로 보여주는 그래프.3 is a graph schematically showing the temperature characteristic of dielectric constant for (Ba x Pb 1-x ) TiO 3 solid solution.

상기한 본 발명의 목적은, 티탄산바륨과 티탄산납을 적절한 비율로 포함하는 고용체 (BaxPb1-x)TiO3의 세라믹 유전체에 의해 달성된다. 여기에서 상기 χ는 0보다 크고 1 보다 작은 값을 가진다.The above object of the present invention is achieved by a ceramic dielectric of solid solution (Ba x Pb 1-x ) TiO 3 containing barium titanate and lead titanate in an appropriate ratio. Wherein χ has a value greater than zero and less than one.

이하, 본 발명에 따른 세라믹 유전체를 상세히 설명한다. 이하의 구체예는 본 발명에 따른 세라믹 유전체를 예시적으로 설명하는 것일 뿐 본 발명의 범위를 제한하는 것으로 의도되지 아니한다.Hereinafter, the ceramic dielectric material according to the present invention will be described in detail. The following embodiments are merely illustrative of the ceramic dielectric material according to the present invention and are not intended to limit the scope of the present invention.

일반적으로 유전체는 유전율이 높을수록, 그리고 유전율의 온도특성이 평판할수록 바람직한 것으로 여겨지고 있다. 티탄산바륨은 앞서 언급한 바와 같이 큐리온도인 120℃부근에서 유전율이 극대치에 달하지만 온도특성이 대단히 급격하다. 따라서 본 발명에서는 티탄산바륨의 온도 특성을 바람직하게 변화시키기 위해 티탄산납을 사용하여 티탄산바륨과 티탄산납의 고용체를 제공한다.In general, it is considered that the dielectric has a higher permittivity and a better temperature characteristic of the permittivity. As mentioned above, barium titanate has a very high dielectric constant near the Curie temperature of 120 ° C., but the temperature characteristic is extremely rapid. Accordingly, the present invention provides a solid solution of barium titanate and lead titanate using lead titanate in order to desirably change the temperature characteristics of barium titanate.

즉, 티탄산바륨과 티탄산납의 고용체인 (BaxPb1-x)TiO3를 제공하므로써 온도 특성이 평탄한 고유전율의 세라믹 유전체가 제공된다. 여기에서 상기 χ는 0보다 크고 1보다 작은 값을 가진다.That is, by providing (Ba x Pb 1-x ) TiO 3 , which is a solid solution of barium titanate and lead titanate, a high dielectric constant ceramic dielectric having flat temperature characteristics is provided. Wherein χ has a value greater than zero and less than one.

도3은 (BaxPb1-x)TiO3고용체에 대한 유전율의 온도 특성을 개략적으로 보여주는 그래프이다. 도3에 도시된 바와 같이, χ의 값이 변함에 따라 고용체 (BaxPb1-x)TiO3의 유전율은 120℃와 500℃의 사이에서 높고 평탄한 유전율을 가진다.3 is a graph schematically showing the temperature characteristic of dielectric constant for (Ba x Pb 1-x ) TiO 3 solid solution. As shown in FIG. 3, as the value of χ changes, the dielectric constant of the solid solution (Ba x Pb 1-x ) TiO 3 has a high and flat dielectric constant between 120 ° C and 500 ° C.

본 발명에 따른 (BaxPb1-x)TiO3이 120℃와 500℃의 사이에서 높고 평탄한 유전율을 가진다는 것의 의미는, 상기 χ의 값이 다른 여러 가지의 고용체를 형성하므로써, 필요에 따라 120℃와 500℃ 사이의 온도에서 높은 유전율을 얻을 수 있음을 의미한다.The meaning that (Ba x Pb 1-x ) TiO 3 according to the present invention has a high and flat dielectric constant between 120 ° C and 500 ° C means that various solid solutions having different values of χ are formed as necessary. It means that a high dielectric constant can be obtained at temperatures between 120 ° C and 500 ° C.

본 발명에 따른 (BaxPb1-x)TiO3의 고용체는, 먼저 BaCO2, TiO2, PbO 등의 원료를 적당한 비율로 조합하여 혼합하는 공정, 바인더를 사용하여 혼합물을 조립하는 공정, 건식가압법(dry pressing method)과 같은 방법으로 성형하는 공정, 및 소성용 가마에서 소성시키는 공정으로 이루어지는 일반적인 세라믹 제조 방법에 의해 제조될 수 있다.The solid solution of (Ba x Pb 1-x ) TiO 3 according to the present invention may be prepared by mixing raw materials such as BaCO 2 , TiO 2 , PbO, and the like in an appropriate ratio, assembling the mixture using a binder, and drying. It can be produced by a general ceramic production method comprising a step of molding by a method such as a dry pressing method and a step of firing in a kiln for baking.

이상과 같이 제조되는 (BaxPb1-x)TiO3의 고용체는 각각의 큐리온도(Tc)인 120℃와 500℃ 사이의 온도에서, 고유전율의 결정입자의 주변을 저유전율 결정입자가 둘러싸고 있는 구조를 가지게 된다. 고용체에서 티탄산납의 함량이 증가함에 따라 고용체의 큐리온도는 높아지게 되며, 예를 들면 상기 χ의 값이 0.8인 경우 큐리온도는 220℃부근이 되고 χ의 값이 0.4인 경우 큐리온도는 380℃부근이 된다.The solid solution of (Ba x Pb 1-x ) TiO 3 prepared as described above is surrounded by low dielectric constant crystal grains around the high dielectric constant crystal grains at a temperature between 120 ° C and 500 ° C, each Curie temperature (Tc). It has a structure. As the content of lead titanate in the solid solution increases, the Curie temperature of the solid solution increases. For example, when the value of χ is 0.8, the Curie temperature is around 220 ° C and the Curie temperature is around 380 ° C when the value of χ is 0.4. do.

이상에서 설명한 바와 같이, 본 발명에 따른 (BaxPb1-x)TiO3의 고용체의 세라믹 유전체에 의하면, 고용체의 티탄산바륨(BaTiO3)과 티탄산납(PbTiO3)의 함량을 적절히 조절하므로써 넓은 온도 범위에 걸쳐서 높은 유전율을 나타내는 세라믹 유전체를 제공할 수 있는 효과가 있다.As described above, according to the ceramic dielectric of the solid solution of (Ba x Pb 1-x ) TiO 3 according to the present invention, the content of barium titanate (BaTiO 3 ) and lead titanate (PbTiO 3 ) in the solid solution can be broadly adjusted. There is an effect that can provide a ceramic dielectric exhibiting a high dielectric constant over the temperature range.

Claims (1)

티탄산바륨(BaTiO3)과 티탄산납(PbTiO3)을 주성분으로 하는 (BaxPb1-x)TiO3고용체로 이루어지며, 상기 χ는 0보다 크고 1보다 작은 값을 가지는 것을 특징으로 하는 세라믹 유전체.Ceramic dielectric characterized in that (Ba x Pb 1-x ) TiO 3 solid solution mainly composed of barium titanate (BaTiO 3 ) and lead titanate (PbTiO 3 ), the χ is greater than 0 and less than 1 .
KR1019970077517A 1997-12-30 1997-12-30 A ceramic dielectric KR100251146B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170077393A (en) * 2015-12-28 2017-07-06 삼성전기주식회사 Dielectric ceramic composition and multilayer ceramic capacitor comprising the same
KR20170078123A (en) * 2015-12-29 2017-07-07 삼성전기주식회사 Dielectric composition and multilayer electronic component comprising the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170077393A (en) * 2015-12-28 2017-07-06 삼성전기주식회사 Dielectric ceramic composition and multilayer ceramic capacitor comprising the same
KR20170078123A (en) * 2015-12-29 2017-07-07 삼성전기주식회사 Dielectric composition and multilayer electronic component comprising the same

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