Compositions: ceramic – Ceramic compositions – Titanate – zirconate – stannate – niobate – or tantalate or...
Patent
1999-05-11
2000-12-19
Brunsman, David
Compositions: ceramic
Ceramic compositions
Titanate, zirconate, stannate, niobate, or tantalate or...
501138, 423 84, 423598, 252 623BT, C04B 35468
Patent
active
061627526
ABSTRACT:
The present invention provides barium titanate powder having a withstanding voltage of 800 V/mm or more and a specific resistance at room temperature of 100 .OMEGA..multidot.cm or less, the specific resistance at room temperature undergoing substantially no time-course change. Barium titanate of the powder of the present invention assumes a cubic crystal system. The powder has a particle size of about 0.1 .mu.m or less; the ratio represented by BaCO.sub.3 /BaO as obtained through XPS is about 0.42 or less; the lattice constant is about 0.4020 nm or more; and the ratio represented by Ba/Ti is about 0.988-0.995.
REFERENCES:
patent: 4832939 (1989-05-01), Menashi et al.
patent: 4863883 (1989-09-01), Menashi et al.
"Dependence of the Grain Boundary Potential Barrier Height of BaTiO.sub.3 Ceramics on Donor Dopant Concentration"; J. Illingsworth, et al.; Journal of Physics D: Applied Physics'; 23 (Jul. 14, 1990) No. 7, Bristol, GB; pp. 971-975.
"Studies on the Preparation of Positive, Temperature Coefficient of Resistivity Powder by Two Chemical Steps"; J. Xue, et al.; Journal of Materials Science; vol. 32, No. 22, pp. 6095-6099. (1997) No Month Provided.
Kawamoto Mitsutoshi
Niimi Hideaki
Brunsman David
Murata Manufacturing Co. Ltd.
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