Takuya Kurotaki

Abnormal Tc change of Bi1.6Pb0.4Sr2Ca2(Cu1−zTiz)3Ox (0.01<z<0.1)

Influence of Ti addition (substitution for Cu) on Tc is studied for high Tc Bi1.6Pb0.4Sr2Ca2(Cu1−zTiz)3Ox. An abnormal Tc change is found between z=0.01 and 0.1. Based on results of the electrical resistivity and x‐ray diffraction, the abnormal Tc change is discussed.

Influence of Ti addition on Tc of Bi1.6Pb0.4Sr2Ca2Cu3Ox

Abstract Dependences of Ti addition on T off c are investigated for Bi 1.6 Pb 0.4 Sr 2 Ca 2 Cu 3 O x . Limits of Ti addition ( (compositional substitution for Cu, Pb, Bi, Sr and Ca) to maintain the high T off c are defined. Using the X-ray diffraction and electrical results, the dependences of Ti addition on T off c are discussed.

Critical addition of Ti to maintain the Tc of (Bi1-zTiz)1.6Pb0.4Sr2Ca2Cu3Ox above 100 K

Influence of Ti addition (substitution for Bi) on Tc is studied for high Tc (Bi1-zTiz)1.6Pb0.4Sr2Ca2Cu3Ox. We found a critical Ti addition to keep high Tc (above 100 K) of the (Bi1-zTiz)1.6Pb0.4Sr2Ca2Cu3Ox. The high-Tc phase can be found up to 0.5 of z. It is explained by an abnormal Tc change which is found from 0.3 to 0.5 of z. Based on results of the electrical resistivity and x-ray diffraction, an abnormal Tc change is discussed.

Formation of high-T c Bi1.6Pb0.4Sr2Ca2(Cu0.9Ti0.1)3O x

Influences of sintering conditions onTc are studied for Bi1.6Pb0.4Sr2Ca2(Cu0.9Ti0.1)3Ox. HighTc values are obtained at 1123±5 K sintering temperature and over 50 h sintering time. In order to explain theTc changes, morphological discussion is attempted.

Effects of Ti Addition for Bi1.6Pb0.4Sr2Ca2Cu3Ox

Influence of Ti addition on Tc is studied for high Tc Bi1.6Pb0.4Sr2Ca2Cu3Ox. Although the large amount of Ti is added, the high Tc (above 100 K) samples are found. In order to explain the Tc changes, electronic and morphological discussions are attempted.