Electrical resistors – Resistance value responsive to a condition – Current and/or voltage
Patent
1994-05-24
1996-10-22
Hoang, Tu
Electrical resistors
Resistance value responsive to a condition
Current and/or voltage
338 22R, H01C 710
Patent
active
055681166
ABSTRACT:
A ceramic composition for a thermistor of the formula (M.sup.1.sub.1-x.N.sup.1.sub.x)(P.sup.2.sub.1-y-z.N.sup.2.sub.y.Al.sub.z)O .sub.3 where M.sup.1 is one or more elements selected from the group 3A elements of the Periodic Table excluding La, N.sup.1 is one or more selected from the group 2A elements of the Periodic Table, P.sup.2 is one or more selected from the elements of the groups 4A, 5A, 6A, 7A and 8 of the Periodic Table whose oxides exhibit p-type characteristics, and N.sup.2 is one or more selected from the elements of the groups 4A, 5A, 6A, 7A and 8 whose oxides exhibit n-type characteristics,
wherein x, y and z are larger than 0 and smaller than 1 and 0.001.ltoreq.x/(1-y-z)<0.20, 0.05.ltoreq.y/(1-y-z).ltoreq.0.80 and 0<z/(1-y-z).ltoreq.0.90. Thermistor elements are usable within a broad temperature range of 300.degree.-1100.degree. C., have a stable resistance in oxidizing and reducing atmospheres, can prevent deterioration of lead wires, and have superior stability at high temperatures.
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Hayashi Kyohei
Iwaya Masaki
Matsuzaki Hiroshi
Suematsu Yoshirou
Easthom Karl
Hoang Tu
NGK Spark Plug Co. Ltd.
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