Title :
Effect of perovskite impurity addition on microwave dielectric properties of Ba(Mg1/3Ta2/3)O3-Ba(Ni 1/3Ta2/3)O3 ceramics
Author :
Kim, Shin-Young ; Lee, Hee Young ; Yang, Cheul-Kee ; Kim, Jeong-Joo ; Kim, Tae Hong ; Choy, Tae Goo
Author_Institution :
Dept. of Mater. Sci. & Eng., Yeungnam Univ., Kyongsan, South Korea
Abstract :
Microwave dielectric properties in the system Ba(Mg1-x/3Nix/3Ta2/3)O3 -yBaZrO3 or Ba(Mg1-x/3Nix/3Ta2/3)O3 -zBaSnO3 were investigated with an emphasis on the sintering behavior, phase relations and microstructure-property relationships. The increase of Q value of 13000 at 6 GHz while achieving zero τf occurred when y=0.05. The addition of excess MgO had a detrimental effect on Q value improvement, which is attributable to the segregation of excess MgO along grain boundaries. The appearance of Ba1/2TaO3 second phase would have negative effect on the improvement of and value. Therefore, the fabrication of ceramics without any second phase should be crucial in obtaining improved microwave performance
Keywords :
Q-factor; X-ray diffraction; barium compounds; ceramics; crystal structure; ferroelectric materials; grain boundary segregation; permittivity; sintering; transmission electron microscopy; 6 GHz; Ba(Mg13/Ta23/)O3-Ba(Ni13/Ta 23/)O3 ceramics; Ba(MgO3)(TaO3)-Ba(NiO3)(TaO3); BaMgO3NiO3TaO3-BaSnO3; BaMgO3NiO3TaO3-BaZrO3; Q value; ceramics fabrication; grain boundaries; improved microwave performance; microstructure; microwave dielectric properties; perovskite impurity addition; phase relations; segregation; Ceramics; Dielectric measurements; Electromagnetic heating; Electrons; Grain boundaries; Impurities; Powders; Resonance; Resonant frequency; X-ray scattering;
Conference_Titel :
Applications of Ferroelectrics, 1994.ISAF '94., Proceedings of the Ninth IEEE International Symposium on
Conference_Location :
University Park, PA
Print_ISBN :
0-7803-1847-1
DOI :
10.1109/ISAF.1994.522446
