Patent ID: 7990678
Filing Date: 2011-08-02
Classification: B82Y,C04B,H01G,Y10T

Abstract:
1. A SrTiO 3 -based grain boundary insulation type semiconductor ceramic in which the molar ratio m between the Sr site and the Ti site satisfies the relationship 1.000≦m<1.020; 0.8 to 2.0 moles relative to 100 moles of the Ti element of a donor element having a higher valency than the Sr element is dissolved in the Sr site to form a solid solution; a transition metal element is present in an amount of 0.3 to 1.0 mole relative to 100 moles of the Ti element so as to be segregated in grain boundaries; and the average grain size of crystal grains is 1.0 μm or less, and said ceramic being a grain boundary insulation type semiconductor ceramic.