Method of reducing the evaporation of Pb during the manufacture

Details Method of reducing the evaporation of Pb during the manufacture Method of reducing the evaporation of Pb during the manufacture

1974-07-30

1976-12-14

Padgett, Benjamin R.

Compositions

Electrically conductive or emissive compositions

Metal compound containing

252521, 106 7331, H01B 108

Patent

active

039974790

ABSTRACT:
A method of manufacturing barium titanate semiconducting ceramics having a positive temperature coefficient characteristic of resistivity in which a composite, expressed by a general formula (Ba.sub.1.sub.-x.sub.-y Pb.sub.x R.sub.y) TiO.sub.3 (where 0<x.ltoreq.0.8, y is the remainder and R represents a rare earth element) is mixed with either tantalum or niobium or both in the amount of 0.05 to 0.5 atomic % and fired in the air or in an atmosphere containing oxygen, the total amount of the rare earth in the composite combined with the total amount of tantalum or niobium or both added thereto being in the range of 0.1 to 0.55 atomic %. The addition of tantalum and/or niobium in this manufacturing method prevents the evaporation of lead from the composite and eliminates the need to employ a lead oxide gas atmosphere while providing semiconducting ceramics having stable and excellent ceramic and electrical characteristics.

REFERENCES:
patent: 3474043 (1969-10-01), Andersen et al.
patent: 3490927 (1970-01-01), Kahn et al.
patent: 3533966 (1970-10-01), Moratis
patent: 3586642 (1971-06-01), Matsuo et al.
patent: 3637532 (1972-01-01), Ramisch et al.

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