Temperature Dependence of Dielectric Properties of BaTiO<TEX>$_3$</TEX> doped with Nb<TEX>$_2$</TEX>O<TEX>$_5$</TEX> and CoO

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J. Korean Ceram. Soc. > Volume 35(8); 1998 > Article

Journal of the Korean Ceramic Society 1998;35(8): 864.

Nb$_2$O$_5$와 CoO의 복합첨가가 BaTiO$_3$ 유전특성의 온도안전성에 미치는 효과

최광휘, 황진현, 한영호

성균관대학교 재료공학과

Temperature Dependence of Dielectric Properties of BaTiO$_3$ doped with Nb$_2$O$_5$ and CoO

ABSTRACT

The effect of {{{{ {{Nb }_{2 }O }_{5 } }} and CoO addition on the temperature dependence of the {{{{ {BaTiO }_{3 } }}-based ceramic capa-citor has been studied. X7R with moderate temperature dependence has been developed by means of pre-cisely controlled {{{{ {{Nb }_{2 }O }_{5 } }}/CoO ratio. Dielectric constant(K) and dissipation factor(DF) were 3500 and 1.5% respectively. As the content of {{{{ {{Nb }_{2 }O }_{5 } }} was increased the curie temperature(Tc) was shifted to lower tem-perature and the dielectric constant at Tc was decreased. The proper addition of CoO with {{{{ {{Nb }_{2 }O }_{5 } }} improved the temperature dependence of dielectric properties of the {{{{ {BaTiO }_{3 } }}-based ceramic capacitor.

Key words: BaTiO$_3$, X7R, Capacitor