KR970001057B1 - High -frequency dielectric composition - Google Patents

High -frequency dielectric composition

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Publication number
KR970001057B1
KR970001057B1 KR1019960050578A KR19960050578A KR970001057B1 KR 970001057 B1 KR970001057 B1 KR 970001057B1 KR 1019960050578 A KR1019960050578 A KR 1019960050578A KR 19960050578 A KR19960050578 A KR 19960050578A KR 970001057 B1 KR970001057 B1 KR 970001057B1
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dielectric
temperature coefficient
frequency
ceramic composition
resonance frequency
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KR1019960050578A
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Korean (ko)
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정형진
김현재
김경용
윤석진
윤상옥
데쯔로우 나까무라
미쯔루 이또오
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한국과학기술연구원
김은영
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • H01B3/12—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances ceramics
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/10—Dielectric resonators

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Inorganic Insulating Materials (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

Dielectric ceramic composition for high-frequency wave is described which has high quality coefficient(Q value) and dielectric constant, and good temperature coefficient of resonance frequency. The dielectric ceramic composition may be represented as following formula: (1-z)(Sr1-yCay)TiO3-yLa(Zn1-x/2Mgx/2Ti1/2)O3, where, x is from0 to 1.0, y is from 0.01 to 0.99 and z is from 0.4 to 0.7. The dielectric composition according to the invention has dielectricconstant of 33.1 to 60.2, Qxfo(GHz) of 25,060 to 66,140, and the temperature coefficient of resonance frequency(TCF) ranging from -53.82to +52.32 ppm/deg. C, which TCF being able to be controlled at a rangeof +-10ppm/deg. C depending on amount of addition of impurities, so thatthe ceramic composition may effectively be used in telecommunication system.

Description

고주파용 유전체 조성물High Frequency Dielectric Composition

제1도는 유전체의 조성 변화에 따른 공진 주파수의 온도 계수 변화를 나타낸 그래프.1 is a graph showing the change in temperature coefficient of the resonant frequency according to the composition change of the dielectric.

본 발명은 높은 품질 계수(Q값)와 유전율을 가지며 또한 공진 주파수의 온도계수가 양호한 고주파용 유전체 자기 조성물에 관한 것이다.The present invention relates to a high frequency dielectric ceramic composition having a high quality factor (Q value) and a dielectric constant and having a good temperature coefficient of resonance frequency.

최근, 무선 전화기, 자동차 전화기 등의 이동 통신, 위성 방송, 위성 통신등에 주파수 대역이 300MHz 내지 300GHz인 마이크로파를 이용한 통신 시스템이 현저하게 발전하고 있으며, 이러한 뉴미디어의 실용화를 위해 공진기, 대역 통과(또는 저지) 필터 마이크로파 집적 회로(MIC)등에 고주파용 유전체 세라믹스의 응용이 크게 증대되고 있다. 이러한 고주파용 유전체가 통신 시스템에 사용되기 위해서는, (1) 유전체 내에서 마이크로파의 파장은 유전율의 1/2 승에 반비례하므로 부품의 소형화를 위해서는 유전율이 커야 하고, (2) 유전 손실은 주파수에 비례하여 증가되므로 고성능화를 위해서는 Q값(즉, 유전 손실의 역수)이 높아야 하며, (3) 유전체 공진기의 공진 주파수의 온도 계수가 작아야 한다[워싱(W.Wersing)의 Electronic Ceramics(B.C.H.Steele 편저), 67페이지, 미합중국 뉴욕주 소재 Elsevier Sci. Pub. Co.(1991) 참조]. 또한, 통신 시스템에 사용되는 고주파용 유전체는 경시 변화가 작고, 열전도율이 커야 하며, 기계적 강도가 양호해야 한다.Recently, a communication system using microwaves with a frequency band of 300 MHz to 300 GHz for mobile communication, satellite broadcasting, and satellite communication of wireless telephones, automobile telephones, and the like, has been remarkably developed. The application of high frequency dielectric ceramics to filter microwave integrated circuits (MIC) has been greatly increased. In order to use such a high frequency dielectric in a communication system, (1) the wavelength of the microwave in the dielectric is inversely proportional to the half power of the dielectric constant, so the dielectric constant must be large for the miniaturization of components, and (2) the dielectric loss is proportional to the frequency. In order to achieve high performance, the Q value (that is, the inverse of the dielectric loss) must be high, and (3) the temperature coefficient of the resonance frequency of the dielectric resonator must be small (W.Wersing's Electronic Ceramics (BCHSteele), Elsevier Sci., New York, United States, page 67. Pub. Co. (1991). In addition, the high frequency dielectric used in the communication system should have a small change over time, a large thermal conductivity, and a good mechanical strength.

지금까지 개발된 유전체로는, Ba(M+2 1/3M+5 2/3))O3(M+2=Mg, Zn, M+5=Ta, Nb)계, Ba2Ti9O20계 및 (Zr,Sn)TiO4계를 들 수 있는데, 이러한 유형의 유전체는 유전율이 40 이하이지만 유전 손실이 낮다. 또다른 예로는, BaO-Sm2O3-TiO2계, (Ba,Pb) O-Nd2O3-TiO2계 및 (Pb,Ca)ZrO3계를 들 수 있는데, 이 유전체의 유전 손실은 비교적 크지만(Qxfo(GHz)10,000) 유전율이 80 이상인 것으로 알려져 있다[상기 워싱 문헌; 및 J. Kato, JEE, Sep., 114-118(1981)참조].As dielectrics developed so far, Ba (M +2 1/3 M +5 2/3 )) O 3 (M +2 = Mg, Zn, M +5 = Ta, Nb) type, Ba 2 Ti 9 O 20 series and (Zr, Sn) TiO 4 series, which have a dielectric constant of 40 or less but low dielectric loss. Another example is BaO-Sm 2 O 3 -TiO 2 -based, (Ba, Pb) O-Nd 2 O 3 -TiO 2 -based and (Pb, Ca) ZrO 3 -based dielectric loss of the dielectric Is relatively large (Qxfo (GHz) 10,000) but is known to have a dielectric constant of 80 or more [Washing literature; And J. Kato, JEE, Sep., 114-118 (1981).

일반적으로, 유전율이 큰 재료는 유전체 내부의 쌍극자와 결함 등으로 인하여 유전 손실과 공진 주파수의 온도 계수가 증가하게 되는데, 고주파용 유전체는 우선적으로 공진 주파수의 온도 계수가 안정하여야 응용이 가능하다.In general, materials with high dielectric constants increase dielectric loss and temperature coefficients of resonance frequencies due to dipoles and defects in dielectrics. However, high-frequency dielectrics can be applied only when the temperature coefficients of resonance frequencies are stable.

(SrCa)TiO3의 경우, 2 GHz에서 유전율은 177 내지 255정도로 매우 높지만, 공진 주파수의 온도 계수가 +800 내지 +1,670ppm/℃로 매우 큰 문제점이 있다. 한편, La(Zn1-x/2Mgx/2Ti1/2)O3의 경우에는, 유전율은 28 내지 31 정도로 낮지만 Qxfo( GHz)가 80000 내지 91000 정도로 매우 높고, 공진 주파수의 온도 계수가 -55 내지 -70ppm/℃ 정도이다.In the case of (SrCa) TiO 3 , the dielectric constant is very high at about 177 to 255 at 2 GHz, but there is a problem that the temperature coefficient of the resonance frequency is +800 to +1,670 ppm / 占 폚. On the other hand, in the case of La (Zn 1-x / 2 Mg x / 2 Ti 1/2 ) O 3 , the dielectric constant is as low as 28 to 31 but the Qxfo (GHz) is very high as 80000 to 91000, and the temperature coefficient of the resonance frequency is high. Is about -55 to -70 ppm / 占 폚.

따라서, 본 발명의 목적은 유전율이 40 이상으로 크면서 유전 손실이 적은 고주파용 유전체 조성물을 제공하는 것이다.Accordingly, an object of the present invention is to provide a dielectric composition for high frequency with a high dielectric constant of 40 or more and low dielectric loss.

본 발명의 다른 목적은 공진 주파수의 온도 계수를 조절할 수 있는 고주파용 유전체 조성물을 제공하는 것이다.Another object of the present invention to provide a dielectric composition for high frequency that can adjust the temperature coefficient of the resonance frequency.

위와 같은 본 발명의 목적은 다음과 같은 조성식을 갖는 유전체 자기 조성물을 제공함으로써 달성된다.The object of the present invention as described above is achieved by providing a dielectric ceramic composition having the following compositional formula.

식중, 0≤x≤1,0, 0.01≤y≤0.999M 0.4≤z1d0.7.Wherein 0 ≦ x ≦ 1,0, 0.01 ≦ y ≦ 0.999M 0.4 ≦ z1d0.7.

본 발명에 따른 유전체 조성물은 유전율이 33.1 내지 60.2이고 Qxfo(GHz)가 25,060 내지 66,140이며 공진 주파수의 온도 계수(TCF)가 -53.82 내지 +52.32 ppm/℃로 불순물 첨가량에 따라 TCF를 ±10ppm/℃로 조절이 가능하여 고주파용 유전체 세라믹스가 요구되는 통신 시스템에 적합하게 이용될 수 있다.The dielectric composition according to the present invention has a dielectric constant of 33.1 to 60.2, a Qxfo (GHz) of 25,060 to 66,140, a temperature coefficient of resonant frequency (TCF) of -53.82 to +52.32 ppm / ° C, and a TCF of ± 10 ppm / ° C depending on the amount of impurity added. It is possible to adjust the furnace to be suitable for the communication system requiring high frequency dielectric ceramics.

본 발명의 유전체 자기 조성물은 SrTiO3및 CaTiO3와 La(Zn1/2Ti1/2)O3및 La(Mg1/2Ti1/2)O3를 주성분으로 하는 페로브스카이트형 고용체로서 각 성분의 조성 범위는 표 1과 같다. 이러한 범위의 조성을 갖는 유전체 조성물은 공진 주파수의 온도 계수가 최대 +83.60ppm/℃, 최소 -39.35ppm/℃ 범위에 있으므로, 이 자체로서 또는 첨가제의 양을 변화시킴으로써 유전 손실이 적고 온도 특성이 양호한 마이크로파 유전체 자기를 얻을 수 있다.The dielectric ceramic composition of the present invention is a perovskite solid solution composed mainly of SrTiO 3 and CaTiO 3 and La (Zn 1/2 Ti 1/2 ) O 3 and La (Mg 1/2 Ti 1/2 ) O 3 . The composition range of each component is shown in Table 1. Dielectric compositions having a composition in this range have a low dielectric loss and good temperature characteristics, either by themselves or by varying the amount of additives, because the temperature coefficient of the resonance frequency is in the range of up to +83.60 ppm / ° C and at least -39.35 ppm / ° C. Dielectric porcelain can be obtained.

본 발명의 유전체 자기 조성물의 특성은 SrTiO3및 CaTiO3의 양에 따라서 크게 변화된다. SrTiO3및 CaTiO3의 함량이 증가함에 따라 유전율은 30 내지 60의 범위에서 서서히 증가하지만, Qxfo(GHz)는 크게 감소하고, 공진 주파수의 온도 계수는 제1도에서 보는 바와 같이 -에서 +로 점진적으로 변화된다. 특히, SrTiO3의 함량이 0.5mol 부근에서는 유전율이 37.8 내지 42.2이고, Qxfo가 36,000 이상이며 공진 주파수의 온도 계수가 10ppm/℃ 이하인 우수한 마이크로파용 유전체 자기를 제조할 수 있다.Dielectric properties of the ceramic composition of the present invention is greatly changed according to the amount of SrTiO 3 and CaTiO 3. As the contents of SrTiO 3 and CaTiO 3 increase, the dielectric constant gradually increases in the range of 30 to 60, but Qxfo (GHz) decreases significantly, and the temperature coefficient of the resonant frequency gradually increases from-to + as shown in FIG. Is changed. Particularly, when the SrTiO 3 content is around 0.5 mol, excellent microwave dielectric porcelains having a dielectric constant of 37.8 to 42.2, a Qxfo of 36,000 or more, and a temperature coefficient of resonance frequency of 10 ppm / ° C or less can be produced.

본 발명에 의한 유전체 자기 조성물은 출발 물질로서 예를 들어 SrCO3, CaCO3, La2O3, TiZnO 및 MgO를 사용하여 일반적으로 알려진 세라믹스 제조 공정으로 처리함으로써 제조할 수 있다. 구체적으로 설명하면, SrCO3, CaCO3, La2O3, TiO2, ZnO 및 MgO를 일정 조정비로 혼합한 분말을 대기 중에서 예를 들면 1,050℃의 온도에서 10시간 정도 하소한 후 분쇄하고, 다시 1,200 내지 1,300℃에서 충분한 시간, 예를 들면 6시간 동안 재하소하여 페로브스카이트 구조를 갖는 고용체를 합성한다. 합성 분말은 잘 분쇄한 후, 예를 들어 직경 10mm, 두께 1 내지 2mm의 원판형 시편으로 가압 성형하여 대기 중에서 예를 들어 1,500 내지 1,650℃의 온도에서 2 내지 6시간 동안 소결시킴으로써 제조할 수 있다. 이때, 소결 온도는 MgO의 함량이 증가할수록 높아지고, 소결후 시편의 수축율은 12 내지 20% 정도이다.The dielectric ceramic composition according to the present invention can be prepared by treatment with a generally known ceramic manufacturing process using, for example, SrCO 3 , CaCO 3 , La 2 O 3 , TiZnO and MgO as starting materials. Specifically, the powder mixed with SrCO 3 , CaCO 3 , La 2 O 3 , TiO 2 , ZnO and MgO at a constant adjustment ratio is calcined in the air, for example, at a temperature of 1,050 ° C. for about 10 hours, and then ground again. It is calcined at 1,200 to 1,300 ° C. for a sufficient time, for example 6 hours, to synthesize a solid solution having a perovskite structure. The synthetic powder may be prepared by pulverizing well, for example, by press molding into a disc-shaped specimen having a diameter of 10 mm and a thickness of 1 to 2 mm and sintering for 2 to 6 hours at a temperature of, for example, 1,500 to 1,650 ° C in the air. At this time, the sintering temperature is increased as the content of MgO increases, the shrinkage of the specimen after sintering is about 12 to 20%.

소결 시편의 유전율, Q값 및 공진 주파수의 온도 계수 등의 유전 특성은 공지된 유전체 공진기법으로 측정할 수 있다.Dielectric properties such as dielectric constant, Q value and temperature coefficient of resonance frequency of the sintered specimen can be measured by a known dielectric resonant technique.

이하, 본 발명을 실시예로써 더욱 상세히 설명한다. 그러나 본 발명이 실시예에 의하여 한정되는 것은 아니다.Hereinafter, the present invention will be described in more detail with examples. However, the present invention is not limited by the embodiment.

실시예Example

순도 99.9%의 SrCO3, CaCO3, La2O3, TiO2, ZnO 및 MgO를 하기 표 1에 나타낸 조성비로 혼합하고, 혼합 분말을 대기 중에서, 1,050℃의 온도에서 10시간 정도 하소한후 분쇄하고, 다시 1,200∼1,300℃에서 6시간 동안 재하소하여 페로브스카이트 구조를 갖는 고용체를 합성하였다.SrCO 3 , CaCO 3 , La 2 O 3 , TiO 2 , ZnO and MgO with a purity of 99.9% are mixed at the composition ratio shown in Table 1 below, and the mixed powder is calcined in the air at a temperature of 1,050 ° C. for about 10 hours and then pulverized. Then, again calcining at 1,200 ~ 1,300 ℃ for 6 hours to synthesize a solid solution having a perovskite structure.

합성 분말을 잘 분쇄한 후 직경 10mm, 두께 1 내지 2mm의 원판형 시편으로 가압 성형하여 대기 중에서 1,500 내지 1,600℃의 온도에서 2 내지 6시간 동안 소결시켰다. 소결후 시편은 12 내지 20% 정도 수축되었다.The synthetic powder was pulverized well and pressure-molded into a disc-shaped specimen having a diameter of 10 mm and a thickness of 1 to 2 mm, followed by sintering for 2 to 6 hours at an air temperature of 1,500 to 1,600 ° C. After sintering, the specimens shrink about 12-20%.

소결 시편의 양면을 연마지(#3000까지)로 잘 연마한 후, 도파관 속에 넣고 유전체 공진기법으로 유전율, Q값 및 공진 주파수의 온도 계수를 측정하였다.Both surfaces of the sintered specimen were polished well with abrasive paper (up to # 3000), and then placed in a waveguide, and the dielectric constant, Q value, and temperature coefficient of the resonance frequency were measured by the dielectric resonant technique.

이때, 측정 주파수는 8 내지 12HGz이고, 측정 온도 범위는 -15 내지 85℃였다.At this time, the measurement frequency was 8-12HGz, and the measurement temperature range was -15-85 degreeC.

각 시편의 마이크로파 유전 특성을 표 1에 나타내었다.The microwave dielectric properties of each specimen are shown in Table 1.

Claims (1)

하기 조성식으로 나타내어지는 고주파용 유전체 조성물.A dielectric composition for high frequency represented by the following formula. 식중, 0.01≤y≤0.99, 0.4≤z≤0.7.Wherein 0.01 ≦ y ≦ 0.99, 0.4 ≦ z ≦ 0.7.
KR1019960050578A 1994-06-21 1996-10-31 High -frequency dielectric composition KR970001057B1 (en)

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