Influence of B₂O₃Additions and Sintering Temperature on Microwave Dielectric Properties of La_2.9/3Ba_0.05(Mg_0.5Sn_0.5)O₃Ceramics

Abstract

The microwave dielectric properties of La 2.9/3 Ba 0.05 (Mg 0.5 Sn 0.5 )O 3 ceramics were prepared with a view to their potential for mobile communication. The La 2.9/3 Ba 0.05 (Mg 0.5 Sn 0.5 )O 3 ceramics were prepared by the conventional solid-state method. B 2 O 3 was selected as a liquid sintering aid to reduce the sintering temperature of La 2.9/3 Ba 0.05 (Mg 0.5 Sn 0.5 )O 3 ceramics. The X-ray diffraction patterns of the La 2.9/3 Ba 0.05 (Mg 0.5 Sn 0.5 )O 3 ceramics with 0.25 wt% B 2 O 3 additive exhibited no significant variation of phase with sintering temperature. A maximum dielectric constant and quality factor (Q × f) were obtained for La 2.9/3 Ba 0.05 (Mg 0.5 Sn 0.5 )O 3 with 0.25 wt% B 2 O 3 additive that were sintered at 1400 • C for 4 h. A temperature coefficient of resonant frequency τ f (−77 ppm/ • C) was measured when La 2.9/3 Ba 0.05 (Mg 0.5 Sn 0.5 )O 3 ceramics with 0.25 wt% B 2 O 3 that were sintered at 1400 • C for 4 h.