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http://dx.doi.org/10.4191/KCERS.2002.39.9.890

Effect of Sintering Time on Microwave Dielectric Properties of Layered Mg0.93Ca0.07TiO3-(Ca0.3Li0.14Sm0.42)TiO3 Ceramics  

Cho, Joon-Yeob (Department of Ceramic Engineering, Yonsei University)
Yoon, Ki-Hyun (Department of Ceramic Engineering, Yonsei University)
Kim, Eung-Soo (Department of Materials Engineering, Kyonggi University)
Kim, Tae-Hong (Information Technology Research Group, Electronics and Telecommunications Research Institute)
Publication Information
Journal of the Korean Ceramic Society / v.39, no.9, 2002 , pp. 890-895 More about this Journal
Abstract
Effect of the sintering time on the microwave dielectric properties of the layered Functionally Graded Materials(FGMs) of the Mg0.93Ca0.07TiO3(MCT) with (Ca0.3Li0.14Sm0.42)TiO3(CLST) ceramics was investigated. The dielectric constant of layered FGMs specimens showed a nearly constant value and did not change significantly with sintering time. The quality factor, however, was affected by the relative density and thermal stress developed in each dielectric layer. With an increase of the relative density and the decrease of the induced thermal stresses, quality factor of the layered FGMs specimens increased and the quality factor was incluenced sensitively by the change of compressive stress developed in MCT layers which had a lower thermal expansion coefficient than that of CLST. For the layered FGMs specimen sintered at 1300$^{\circ}C$ for 9h, the compressive stress developed in MCT layer showed the maximum value, which, in turn, the quality factor of the specimen was the minimum value.
Keywords
Layered FGMs; $Mg_{0.93}Ca_{0.07}TiO_3$; $(Ca_{0.3}Li_{0.14}Sm_{0.42})TiO_3$; Quality factor; Thermal stress;
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