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John P Witham

Clive A Randall

Joseph P Dougherty

Ulagaraj Selvaraj

Sea-Fue Wang

Umesh Kumar

Hydrothermal BaTiO,crystallites were coated with Bismuth solutions prepared from Bismuth metal-organics and anhydrous solvents. The Bismuth metal-organics were Bi 2-ethylhexanoate and Bi-neodecanoate. Bismuth oxide was also used as a comparison to the Bismuth solutions. BaTiO,ceramics with either 3.0 wt % equivalent Bismuth oxide or 5.0 wt % equivalent Bismuth oxide were made by sintering the compacts between 700&deg; C. and 1000&deg; C. BaTiO,ceramics that were coated by Bi-neodecanoate densified >90% theoretical as low as 800&deg; C. for 3.0 wt % equivalent Bi,O,. Average grain sizes of 0.2-0.4 &mgr;m were observed for Bi-coated BaTiO,ceramics, for sintering temperatures below 950&deg; C. Dielectric K versus temperature measurements of Bismuth-coated BaTiO,ceramics, sintered in the lower temperature ranges, showed consistently superior dielectric characteristics.

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Fountain Valley, CA, United States of America

John P Witham