| 摘要 |
The present invention provides a semiconductor magnetic composition and a PTC thermistor, which can be semiconducted easily under either air or nitrogen atmosphere and has a superior resistivity/resistor temperature coefficient α. The semiconductor ceramic composition which includes a compound represented by the following formula (1) as a main component. The formula (1) is {Ba_(1-x-y-w)Bi_xA_yRE_w)_m{Ti_(1-z)TM_z}O_3, wherein A is at least one element selected from Na or K, RE is at least one element selected from the group consisting of Y, La, Ce, Pr, Nd, Sm, Gd, Dy and Er, TM is at least one element selected from the group consisting of V, Nb and Ta, w, x, y, z and m satisfy the following relationships of (2)-(5): 0.007<=x<=0.125 (2), x<y<=2.0x (3), 0<=(w+z)<=0.01 (4), and 0.94<=m<=0.999 (5). Ca is contained at a ratio of 0.01-0.055 mol with respect to 1 mol of Ti site. |
