Effect of Li2CO3-H3BO3 on the microwave dielectric properties of 0.8Ca0.85Nd0.1TiO3-0.2SmAlO3 ceramics
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0.8Ca0.85Nd0.1TiO3-0.2SmAlO3 (CNT-SA) ceramics with Li2CO3-H3BO3 were prepared by a conventional solid-state reaction method to develop new microwave dielectric materials with a low sintering temperature. With the addition of 8 wt.% Li2CO3- H3BO3, the sintering temperature of CNT-SA ceramics was effectively reduced to 950oC without degradation of the microwave dielectric properties. These results are due to the enhancement of the density by liquid phase sintering. The dielectric constant (K) and Qf value of the specimens depended on the density and grain size. The temperature coefficient of the resonant frequency (TCF) of the specimens was largely affected by the relative ratio of H3BO3 to Li2CO3. Good microwave dielectric properties with values of K=50.6, Qf=8,100 GHz, and TCF=19.7 ppm/oC were obtained in CNT-SA ceramics with 8 wt.% Li2CO3-H3BO3 sintered at 950oC for 4 h.
Abstract
0.8Ca0.85Nd0.1TiO3-0.2SmAlO3 (CNT-SA) ceramics with Li2CO3-H3BO3 were prepared by a conventional solid-state reaction method to develop new microwave dielectric materials with a low sintering temperature. With the addition of 8 wt.% Li2CO3- H3BO3, the sintering temperature of CNT-SA ceramics was effectively reduced to 950oC without degradation of the microwave dielectric properties. These results are due to the enhancement of the density by liquid phase sintering. The dielectric constant (K) and Qf value of the specimens depended on the density and grain size. The temperature coefficient of the resonant frequency (TCF) of the specimens was largely affected by the relative ratio of H3BO3 to Li2CO3. Good microwave dielectric properties with values of K=50.6, Qf=8,100 GHz, and TCF=19.7 ppm/oC were obtained in CNT-SA ceramics with 8 wt.% Li2CO3-H3BO3 sintered at 950oC for 4 h.