The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 02, 2001
Filed:
Apr. 28, 1997
John P. Witham, Fountain Valley, CA (US);
Clive A. Randall, State College, PA (US);
Umesh Kumar, Surfside Beach, SC (US);
Ulagaraj Selvaraj, Apex, NC (US);
Sea-Fue Wang, Brookfield, CT (US);
Joseph P. Dougherty, State College, PA (US);
Other;
Abstract
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° C. and 1000° C. BaTiO,ceramics that were coated by Bi-neodecanoate densified >90% theoretical as low as 800° 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° C. Dielectric K versus temperature measurements of Bismuth-coated BaTiO,ceramics, sintered in the lower temperature ranges, showed consistently superior dielectric characteristics.