| abstract |
The invention relates to a PTCR resistor with the following properties: DOLLAR A - it consists of a ceramic material of the composition DOLLAR A [(Ba¶1-ex¶Sr¶x¶R¶e¶) ¶1-a¶M¶a¶ ] [Ti¶1-bd¶N¶b¶Q¶d¶)] ¶c¶O¶3¶, with DOLLAR AM: trivalent or tetravalent element or a mixture of two or more of these elements, DOLLAR AN: five- or hexavalent element or a mixture of two or more of these elements, DOLLAR AQ: quadrivalent element or a mixture of two or more of these elements, DOLLAR AR: divalent element or a mixture of two or more of these elements, and DOLLAR A 0.5 x 1 , DOLLAR A a = 0 or 0.0003 a 0.3, DOLLAR A b = 0 or 0.0003 b 0.3 DOLLAR A whereby the case a = 0 and at the same time b = 0 is excluded, DOLLAR A 0.8 c 1,2, DOLLAR A 0 d 0,2, DOLLAR A 0 e 0,2, and DOLLAR A - the temperature coefficient of the electrical resistance is in the temperature range from -50 ° C to 250 ° C long positive, DOLLAR A - the specific resistance rho at room temperature can be set in the range from 10 · -6 · OMEGAm to 3 x 10 · -1 · OMEGAm, DOLLAR A - the Curie temperature of the material is below the temperature range of -50 DEG C to 250 DEG C. |