Ceramic composition with improved electrical and mechanical prop

Details Ceramic composition with improved electrical and mechanical prop Ceramic composition with improved electrical and mechanical prop

1987-08-26

1988-12-13

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

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

501135, C04B 3546

Patent

active

047910780

ABSTRACT:
A ceramic composition comprising a solid solution of the ternary system consisting essentially of lead magnesium-niobate (Pb(Mg.sub.1/3 Nb hd 2/3)O.sub.3), lead nickel-niobate (Pb(Ni.sub.1/3 Nb.sub.2/3)O.sub.3) and lead titanate (PbTiO.sub.3) as a major constituent, and an additional constituent consisting essentially of lead manganese-niobate (Pb(Mn.sub.1/3 Nb.sub.2/3)O.sub.3). The ternary system is expressed by the general formula [Pb(Mg.sub.1/3 Nb.sub.2/3)O.sub.3 ].sub.x -[Pb(Ni.sub.1/3 Nb.sub.2/3)O.sub.3 ].sub.y -[PbTiO.sub.3 ].sub.z wherein the subscripts x, y and z satisfy the equation x+y+z=1 and fall within the region defined by the line segments joining the seven points A, B, C, D, E, F and G within the triangular ternary-system diagram shown in the accompanying drawing. Preferably, the lead manganese-niobate (Pb(Mn.sub.1/3 Nb.sub.2/3)O.sub.3) is contained in a proportion of 0.01 mol % to 10 mol % to the major constituent.

REFERENCES:
patent: 4265668 (1981-05-01), Fujiwara et al.
patent: 4399544 (1982-07-01), Sakabe et al.
patent: 4574255 (1986-03-01), Fujii et al.
patent: 4712156 (1987-12-01), Bardham

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