Barium titanate powders

Details Barium titanate powders Barium titanate powders

1988-02-01

1989-05-09

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Titanate, zirconate, stannate, niobate, or tantalate or...

501136, 501137, 501138, 423598, 423619, C04B 3546, C04B 3549

Patent

active

048290335

ABSTRACT:
Barium titanate based dielectric compositions having the general formula Ba.sub.(1-x-x'-x") Pb.sub.x Ca.sub.x' Sr.sub.x" Ti .sub.(1-y-y'-y") Sn.sub.y Zr.sub.y' Hf.sub.y" O.sub.3, wherein x, x', x" and y, y', y" represent mole fractions of the divalent and tetravalent cations and x and x' have independent value greater than 0.01 and less than 0.3 and x", y, y' and y" have independent values greater than zero and less than 0.3, such that the sum (x+x'+x") is greater than 0.01 and less than 0.4 and the sum (y+y'+y") does not exceed 0.4. Regardless of the specific composition selected, the products of the invention have a mean primary particle size in the range of 0.05 to 0.4 microns with a very narrow particle size distribution. The products are dispersible so that the mean particle size determined by image anaylsis and by sedimentation are comparable.

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