Abstract
Effects of B2O3 and/or Bi2O3 on the sinterability and microwave dielectric properties of nonstoichiometric Ca(Li1/3Nb2/3)O3-δ(CLN) ceramics were investigated. With the addition of B2O3 from 0.5 wt% to 4.0 wt%, the dielectric constant (K) and Q·f value of CLN sintered at 990°C were as good as those of pure CLN sintered at 1150°C. These results are due to the enhancement of the apparent density of CLN at low temperature by liquid phase sintering with compositional modification of Ca(Li1/3Nb2/3)O3-δ. However, the dielectric properties of the specimens with 6.0 wt% B2O3 decreased significantly due to the formation of a secondary phase, Li2B4O7. The sintering temperature of CLN was further reduced by Bi2O3 at the expense of the Q·f value. Typically, K of 30.6, Q·f of 31000 GHz, and TCF of -17.5 ppm/°C were obtained for the specimens with 4.0 wt% B2O3 sintered at 1000°C.
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