Abstract: Provided is a thermistor sintered body which stably provides a desired B constant even if a composition deviation of an additive element has occurred. The thermistor sintered body-includes a Y2O3 phase and a YMnO3 phase, wherein a chemical composition of Cr, Mn, Ca and Y excluding oxygen includes Cr: 3 mol % or less (while including 0%), Mn: 5 to 18 mol %, Ca: 1 to 18 mol %, and Sr: 1 to 25 mol %, with the balance being unavoidable impurities and Y. In the thermistor sintered body, Ca and Sr may be dissolved in the YMnO3 phase.

Abstract: A temperature sensor element includes: an element main body including a heat sensitive body including a thermistor sintered body of which the electrical characteristics change with temperature, and a pair of lead wires that is connected to the heat sensitive body through electrodes; and a protective layer that protects the heat sensitive body. The protective layer has an inner protective layer covering the heat sensitive body and an outer protective layer covering the outer side of the inner protective layer. The inner protective layer is formed of an aggregate of particles that are chemically stable with respect to the thermistor sintered body and made of non-metal.

Abstract: A thermistor sintered body and a temperature sensor element that can adjust a resistance value in a wider range while suppressing an influence on a B constant. A thermistor sintered body of the present invention includes: a Y2O3 phase as a main phase; and a Y(Cr/Mn)O3 phase as a subphase, wherein a chemical composition of Cr, Mn, Ca, Pr and Y excluding oxygen includes one or two of Cr: 20 mol % or less and Mn: 20 mol % or less, Ca: 1 to 15 mol %, and Pr: 0.5 to 30 mol %, with the balance being unavoidable impurities and Y. In the present invention, preferably, the subphase is a Y(Cr,Mn)O3 phase or a YCrO3 phase, and Pr is dissolved in the Y(Cr,Mn)O3 phase or the YCrO3 phase.

Abstract: A thermistor sintered body and a temperature sensor element that can adjust a resistance value in a wider range while suppressing an influence on a B constant. A thermistor sintered body of the present invention includes: a Y2O3 phase as a main phase; and a Y(Cr/Mn)O3 phase as a subphase, wherein a chemical composition of Cr, Mn, Ca, Pr and Y excluding oxygen includes one or two of Cr: 20 mol % or less and Mn: 20 mol % or less, Ca: 1 to 15 mol %, and Pr: 0.5 to 30 mol %, with the balance being unavoidable impurities and Y. In the present invention, preferably, the subphase is a Y(Cr,Mn)O3 phase or a YCrO3 phase, and Pr is dissolved in the Y(Cr,Mn)O3 phase or the YCrO3 phase.

Abstract: A thermistor sintered body stably provides a desired B constant even if a composition deviation of an additive element has occurred. The thermistor sintered body includes a Y2O3 phase and a Y(Cr, Mn)O3 phase, wherein a chemical composition of Cr, Mn, Ca, and Y excluding oxygen is Cr: 3 to 12 mol %, Mn: 5 to 15 mol %, Ca: 1 to 8 mol %, and Sr: 1 to 25 mol %, with the balance being unavoidable impurities and Y. In the thermistor sintered body, Ca and Sr may be dissolved in the Y(Cr, Mn)O3 phase.

Abstract: A thermistor sintered body that can control a B constant at 1000° C. to the same level as that of a conventional wide range type. The thermistor sintered body according to the present invention has a composite structure that includes a Y2O3 phase and a Y(Cr, Mn)O3 phase or a YMnO3 phase. In the thermistor sintered body according to one aspect of the present invention, a chemical composition of Cr, Mn, Ca and Y excluding oxygen is Cr: 3 to 9 mol %, Mn: 5 to 15 mol %, Ca: 1 to 8 mol % (where Cr/Mn<1.0), and the balance being unavoidable impurities and Y. In the thermistor sintered body, the B constant (B(0/1000)) determined by the following Expression (1) is 2400 K or lower; B=(lnRm?lnRn)/(1/Tm?1/Tn) . . . (1). Rm: resistance value at 0° C., Rn: resistance value at 1000° C., Tm: 0° C., and Tn: 1000° C.

Abstract: A thermistor sintered body that can control a B constant at 1000° C. to the same level as that of a conventional wide range type. The thermistor sintered body according to the present invention has a composite structure that includes a Y2O3 phase and a Y(Cr, Mn)O3 phase or a YMnO3 phase. In the thermistor sintered body according to one aspect of the present invention, a chemical composition of Cr, Mn, Ca and Y excluding oxygen is Cr: 3 to 9 mol %, Mn: 5 to 15 mol %, Ca: 1 to 8 mol % (where Cr/Mn<1.0), and the balance being unavoidable impurities and Y. In the thermistor sintered body, the B constant (B(0/1000)) determined by the following Expression (1) is 2400 K or lower; B=(ln Rm?ln Rn)/(1/Tm?1/Tn) . . . (1). Rm: resistance value at 0° C., Rn: resistance value at 1000° C., Tm: 0° C., and Tn: 1000° C.