고주파 유전체 세라믹 (Ca0.7Sr0.3)m(TiyZr1 − y)O3의 전기적 특성 및 미세구조
Electrical properties and microstructure of microwave dielectric ceramics (Ca0.7Sr0.3)m(TiyZr1 − y)O3
0
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
고주파 유전체 세라믹 (Ca0.7Sr0.3)m(TiyZr1 − y)O3 의 미세구조 및 전기적 특성에 대한 Ti 이온 및 몰비의 영향을 조사하였다. CaZrO3의 Zr 위치에 Ti 이온의 치환은 세라믹 소체의 소결밀도 및 미세구조에 큰 영향을 미친다. Zr 위치에 Ti 이온의 치환량 증가에 따라, 소결밀도는 급격히 증가하고, 몰비 m = 1.01에서 치밀한 미세조직이 얻어졌다. 한편, 몰비 m =0.99 조성에 대해서는 Ti 치환량이 증가하여도 소결밀도 및 미세구조는 거의 변화가 없이 일정하였다. Ti 치환량 증가에 따라 TCC (temperature coefficient of capacitance) 곡선은 시계방향으로 회전하여 몰비 m = 0.99, 1.01 조성에 대해 COG 특성을 만족하였다. CaZrO3의 TCC 및 소결특성 제어를 위해서는 Ti 치환량이 몰비보다는 효과적임을 보여준다.
Abstract
The effects of mole ratio(A/B) m and Ti-ion on the dielectric properties and microstructure of the microwave dielectric ceramics (Ca0.7Sr0.3)m(TiyZr1 − y)O3 were investigated. Ti ions substituted on Zr-sites in these modified CaZrO3composition strongly affect the sintering density and microstructure of the fired ceramic body. With increasing the amount of Ti substituted on Zr-sites, the sintered density rapidly increased and the dense microstructure was obtained for the compositions having mole ratio of 1.01, whereas the sintered density and microstructure are nearly constant with the content of Ti-ion for the compositions having mole ratio of 0.99. With increasing the content of Ti ion, the curve of TCC (Temperature Coefficient of Capacitance) as a function of temperature rotated clockwise and satisfied the COG characteristics for both of compositions with mole ratio of 0.99 and 1.01. The content of Ti ion seems to be more effective than mole with respect to the controlling of firing and TCC.
참고문헌 (14)
- H. Iwahara, "Proton conduction in sintered oxides and its application to steam electrolysis for hydrogen production", Solid State Ionics, 3, pp.359~ (1981)
- W. Wersing, "Microwave ceramics for resonators and filters", Current Opinion in Solid State and Materials Science, 1, pp.715~ (1996)
- V.M. Ferreira, "The effect of Cr and La on MgTiO3 and MgTiO3-CaTiO3 microwave dielectric ceramics", J. Mater. Res., 12, pp.3293~ (1997)
- G. Huang, "Low-temperature sintering and microwave dielectric properties of (Zr,Sn)TiO4 ceramics", Mater. Sci and Eng. B., 99, pp.416~ (2003)
- A. Ioachim, "BNT ceramics synthesis and characterization", Mater. Sci and Eng. B., 109, pp.183~ (2004)
- Y. Suzuki, "New uniformly porous CaZrO3", MgO composites with three-dimensional network structure from natural dolomite, 2000, pp.83, 2091~
- S.K. Lim, "The design of a temperature-stable stepped impedance resonator using composite ceramic materials", IEEE Microwave and Guided Wave Letters, 9, pp.143~ (1999)
- T. Yamagushi, "Newly developed ternary (Ca,Sr,Ba)zirconate ceramic system for microwave resonator", Ferroelectrics, 27, pp.273~ (1980)
- K. Albertsen, "Donoracceptor charge complex formation in barium titanate ceramics: Role of firing atmosphere", J. Electroceram., 2, pp.193~ (1998)
- S. Sato, "Effect of Y-Doping on resistance degradation of multilayer ceramic capacitors with Ni electrodes under the highly accelerated life test", Jpn. J. Appl. Phys., 36, pp.6016~ (1997)
- W.H. Lee, "Effects of A", B cation ratio on the microstructure and lifetime of (Ba1 − xCax)z(Ti0.99 − yZryMn0.01)O3 (BCTZM) sintered in reducing atmosphere, 2000, pp.11, 157~
- H. Kanai, "Effects of B2O3 and SiO2 on dielectric properties and reliability of a lead-based relaxor dielectric ceramic", J. Mater. Sci., 31, pp.1609~ (1996)
- H.J.A. Koopmans, "Powder neutron diffraction study of the perovskites CaTiO3 and CaZrO3", Acta Crystallogr. Sect., C39, pp.1323~ (1983)
- Y. Wang, "Ferroelectric characteristics of ytterbium-doped barium zirconium titanate ceramics", Ceramic International, 28, pp.657~ (2002)