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http://dx.doi.org/10.6111/JKCGCT.2010.20.1.021

Electrical properties and microstructure of microwave dielectric ceramics (Ca0.7Sr0.3)m(TiyZr1-y)O3  

Chun, Myoung-Pyo (Korea Institute of Ceramic Engineering and Technology (KICET))
Park, Myoung-Sung (Korea Institute of Ceramic Engineering and Technology (KICET))
Kang, Kyung-Min (Korea Institute of Ceramic Engineering and Technology (KICET))
Nam, Joong-Hee (Korea Institute of Ceramic Engineering and Technology (KICET))
Cho, Jeong-Ho (Korea Institute of Ceramic Engineering and Technology (KICET))
Kim, Byung-Ik (Korea Institute of Ceramic Engineering and Technology (KICET))
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.20, no.1, 2010 , pp. 21-24 More about this Journal
Abstract
The effects of mole ratio(A/B) m and Ti-ion on the dielectric properties and microstructure of the microwave dielectric ceramics $(Ca_{0.7}Sr_{0.3})_m(Ti_yZr_{1-y})O_3$ were investigated. Ti ions substituted on Zr-sites in these modified $CaZrO_3$ composition 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.
Keywords
Dielectric; Ceramics; $CaZrO_3$; MLCC; COG; TCC; A/B ratio; Microstructure;
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