Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Semiconductor ceramic composition and PTC thermistor
A BaTiO3-based semiconductor ceramic composition with small resistivity at room temperature and large temperature coefficient [alpha] of resistance is provided; the composition is represented by formula, (Ba<1-x-y-w>BixAyREw)m(Ti<1-z>TMz)O3 (1), (wherein, A is at least one element from Na or K, RE is at least one element from the group consisting of Y, La, Ce, Pr, Nd, Sm, Gd, Dy and Er, TM is at least one element from the group consisting of V, Nb and Ta, and w, x, y, z (each in mol) and the mole ratio m of Ba site to Ti site satisfy the following in equations, 0.007<=x<=0.125 (2) x<=(w+z)<=0.010 (4) 0.940<=m<=0.999 (5)), and further includes Sr in a proportion of 0.010 mol or more and 0.050 mol or less relative to 1 mol of Ti site, and the mole ratio u of Sr and the mole ratio x of Bi satisfy the following in equation, u<=1.8x-0.008 (6).
Semiconductor ceramic composition and PTC thermistor
A BaTiO3-based semiconductor ceramic composition with small resistivity at room temperature and large temperature coefficient [alpha] of resistance is provided; the composition is represented by formula, (Ba<1-x-y-w>BixAyREw)m(Ti<1-z>TMz)O3 (1), (wherein, A is at least one element from Na or K, RE is at least one element from the group consisting of Y, La, Ce, Pr, Nd, Sm, Gd, Dy and Er, TM is at least one element from the group consisting of V, Nb and Ta, and w, x, y, z (each in mol) and the mole ratio m of Ba site to Ti site satisfy the following in equations, 0.007<=x<=0.125 (2) x<=(w+z)<=0.010 (4) 0.940<=m<=0.999 (5)), and further includes Sr in a proportion of 0.010 mol or more and 0.050 mol or less relative to 1 mol of Ti site, and the mole ratio u of Sr and the mole ratio x of Bi satisfy the following in equation, u<=1.8x-0.008 (6).
Semiconductor ceramic composition and PTC thermistor
SHIMURA YOSHIKAZU (Autor:in) / ITOH KAZUHIKO (Autor:in) / FUJITA KAZUTAKA (Autor:in)
10.02.2016
Patent
Elektronische Ressource
Englisch