Bismuth lamellar compound

Details Bismuth lamellar compound Bismuth lamellar compound

1993-07-28

1994-11-29

Group, Karl

Compositions: ceramic

Ceramic compositions

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

501136, 501137, 501139, 501134, 423593, 423598, 252 629, C04B 3546

Patent

active

053690680

ABSTRACT:
Disclosed is a bismuth layer compound expressed by a chemical formula, (M1.sub.1-2x M2.sub.x Bi.sub.4+x)Ti.sub.4 O.sub.15, wherein "M1" is alkaline earth metal including Sr at least, "M2" is alkali metal, and "x" falls in a range, 0.06.ltoreq.x.ltoreq.0.44. "M1" can be replaced by Pb or combinations of Pb and alkaline earth metal. The bismuth layer compound exhibits a less fluctuating sensitivity with respect to temperature variations. The bismuth layer compound can further include Mn in a form of MnO in an amount of from 0.02 to 0.25% by weight, and thereby it exhibits not only an upgraded sensitivity but also it does not exhibits a hysteresis in a force-electric charge output diagram.

REFERENCES:
patent: 4761242 (1988-08-01), Suzuki et al.
Takenaka et al, Pyroelectric Properties of Bismuth layer-structured ferroelectric ceramics, Ferroelectrics, 118(1-4), 123-33, 1991 no month.
Takenaka et al, Piezoelectric Properties of Grain-oriented Bismuth layer-structured Ferroelectric Ceramics, Proc. IEEE Int. Symp. 6th, pp. 414-417, 1986 no month.

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