Microwave Dielectric Properties of CaO Added <TEX>$(Ba, Pb)O-Nd_2O_3-TiO_2$</TEX> Ceramics

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J. Korean Ceram. Soc. > Volume 30(2); 1993 > Article

Journal of the Korean Ceramic Society 1993;30(2): 101.

CaO첨가$(Ba, Pb)O-Nd_2O_3-TiO_2$ 세라믹스의 고주파 유전특성

윤상옥, 최환¹, 김경용¹

강릉대학교 재료공학과
¹한국과학기술연구원 세라믹공정실

Microwave Dielectric Properties of CaO Added $(Ba, Pb)O-Nd_2O_3-TiO_2$ Ceramics

ABSTRACT

Effects of CaO on microwave dielectric properties of (Ba, Pb)O-Nd2O3-TiO2 ceramic ystem were investigated. As the content of CaO increases, the sintered bulk density decreases due to the decrease of sinterability. However, with increasing the sintering tmperature, the relative dielectric constants increases. This has been attributed on the formation of the 2nd phase inclusion, TiO2(rutile). The Q values increase due to the compensation effect of Ca ions up to 1 wt%, and then decrease due to the interfacial relaxation effects. The temperature coefficient of resonance frequency increases to a positive direction with increasing the amounts of CaO.