H - Electricity – 01 – L
Patent
H - Electricity
01
L
6/194
H01L 41/24 (2006.01) C01G 25/00 (2006.01) C30B 7/00 (2006.01) H01L 41/187 (2006.01) H04R 17/00 (2006.01) H04R 17/08 (2006.01)
Patent
CA 2005036
PROCESS FOR PRODUCING HIGHLY CRYSTALLINE AND HOMOGENOUS SUB-MICRON DOPED AND UNDOPED PIEZOELECTRIC CERAMIC POWDERS WITH CONTROLLED STOICHOMETRY AND PARTICLE SIZE ABSTRACT OF THE INVENTION This invention provides a single crystal, solid solution, chemically homogenous powder of a lead zirconate titanate perovskite compound having useful electrical properties and the general formula Pb(Zr1-xTix)O3, wherein x has a value between 0.44 and 0.56. The powder may also contain other secondary ingredients, such as dopants and solid solution substitutions, up to 13 mole % that alter electrical properties. The powder may have a sintering temperature of less than about 1100°C and a controlled average particle size ranging from about 0.4 to about 1.2 microns. A process for making this powder is also provided which comprises: (a) preparing a first acidic solution containing zirconium and titanium ions, and optionally other ions; (b) preparing a second basic solution containing a sufficient concentration of hydroxide to provide a pre-determined pH when mixed with the first solution; (c) adding the first acidic solution to the second basic solution to precipitate a substantially pure mixture of hydroxides; (d) washing the precipitate and adding a lead compound; (e) preparing an aqueous slurry of the washed precipitate and adding lead ions, and optionally other ions; (f) hydrothermally treating the slurry at an elevated temperature and pressure for a time sufficient to form the powder; and (g) drying the powder.
Dawson William J.
Swartz Scott L.
Dawson William J.
Seaby & Associates
Swartz Scott L.
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