Microstructure of Ba(Mg1/3Ta2/3)O-3-BaSnO3 microwave dielectrics

Ceramics of Ba(Mg1/3Ta2/3)O-3-BaSnO3 (BSMT) are synthesized by a two-stage calcination method. Microstructures are analyzed, using X-ray diffractometr y, transmission elect:ron microscopy, Raman spectroscopy, and scanning elec tron microscopy. The addition of BaSnO3 reduces the cation ordering of Ba(M g1/3Ta2/3)O-3 and its sinterability. Variations in ordered structure with B aSnO3 content are revealed by the reduction in intensity of the superlattic e reflections, the domain size, the c/a ratio, and the shifting and broaden ing in Raman lines. The relations between microstructure and quality factor s of BSMT are discussed. (C) 1999 Elsevier Science Ltd and Techna S.r.l. Al l rights reserved.