Temperature stable monolithic ceramic capacitor with base metal electrodes

Claim 1

A temperature stable monolithic ceramic capacitor comprising a dense fine grained ceramic body at least one base metal electrode buried therein, and at least one other electrode in spaced relationship with said at least one base metal electrode said body having a granular crystal phase of barium titanate and a zirconate and an interstitial phase including a manganese titanate between the grains, said body containing no less than 90 mole percent of said titanate, from 1.5 to 7 mole percent of said zirconate, from 0.5 to 2.3 mole percent manganese and from 0 to 1.7 mole percent of other acceptor dopants selected from magnesium, chromium cobalt and iron, the ratio of the large to small cations in said body being from 0.975 to 1.0 and the ratio of the large to small cations in said granular phase being greater than 1.0, said capacitor having an insulation resistance capacity product of greater than 500 ohm-farads at 25° C and greater than 15 ohm-farads at 125° C and exhibiting a capacity versus temperature characteristic that remains within ± 15% of the value at room temperature over the range of -55° C to 125° C.