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B2O3 added Ba(Mg1/3Nb2/3)O3 (BBMN) ceramics were not sintered below 900 oC. However, when CuO was added to the BBMN ceramic, it was sintered even at 850 oC. The amount of the Ba2B2O5 second phase decreased with the addition of CuO. Therefore, the CuO additive is considered to react with the B2O3 inhibiting the reaction between B2O3 and BaO. Moreover, it is suggested that the solid solution of CuO and B2O3 might be responsible for the decrease of the sintering temperature of the specimens. A dense microstructure without pores was developed with the addition of a small amount of CuO. However, a porous microstructure with large pores was formed when a large amount of CuO was added. The bulk density, the dielectric constant (εr) and the Q-value increased with the addition of CuO but they decreased when a large amount of CuO was added. The variations of those properties are closely related to the variation of the microstructure. The excellent microwave dielectric properties of Qxf = 21500 GHz, εr = 31 and temperature coefficient of resonance frequency(τf) = 21.3 ppm/oC were obtained for the Ba(Mg1/3Nb2/3)O3+2.0 mol%B2O3+10.0 mol%CuO ceramic sintered at 875 oC for 2 h.

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