Influence of superlattice and antiphase domain boundaries on dielectric loss in Ba[Mg{sub 1/3}(Nb{sub x/4}Ta{sub (4-x)/4}){sub 2/3}]O{sub 3} ceramics

• Published in: Applied physics letters 2005-09, Vol.87 (10)
• Main Authors: Lin, C.-F., Lu, H.-H., Chang, T.-I, Huang, J.-L., Department of Mechanical Engineering, National Chin-Yi Institute of Technology, Taichung, Taiwan, Department of Materials Science and Engineering, National Cheng-Kung University, Tainan, Taiwan
• Format: Article
• Language: English
• Subjects: BARIUM COMPOUNDS; CERAMICS; DIELECTRIC MATERIALS; MAGNESIUM COMPOUNDS; MATERIALS SCIENCE; NIOBIUM COMPOUNDS; Q-VALUE; QUALITY FACTOR; SINTERING; STABILIZATION; SUPERLATTICES; TANTALUM COMPOUNDS; TRANSMISSION ELECTRON MICROSCOPY
• ISSN: 0003-6951; 1077-3118
• DOI: 10.1063/1.2041831

The Ba[Mg{sub 1/3}(Nb{sub x/4}Ta{sub (4-x)/4}){sub 2/3}]O{sub 3} ceramics (x=0, 1, 2, 3, and 4) synthesized by a solid reaction method were sintered at 1650 deg. C for 9 h. The quality factor (Q,{approx}1/tan {delta},tan {delta}: dielectric loss) and superlattice structure were investigated by the cavity method and high-resolution electron microscopy. The excellent Q value of 17 600 obtained at appropriate Nb content (x=1). The disorder structure (superlattice modulation{approx}0.41 nm), 1:2 ordering structure (superlattice modulation{approx}0.71 nm) and antiphase domain boundary (APB) were revealed in Ba[Mg{sub 1/3}(Nb{sub x/4}Ta{sub (4-x)/4}){sub 2/3}]O{sub 3} ceramics. The formation of extra ordering structure (superlattice modulation{approx}1.24 nm) on the APBs contributed to the improved Q value with the stabilization of ordering-induced domain boundaries.