TY - JOUR
T1 - The High-Tc Phase with Tc=117K in the Bi,Pb-Sr-Ca-Cu-O System
AU - Takada, Jun
AU - Kitaguchi, Hitoshi
AU - Oda, Kiichi
AU - Miura, Voshinari
AU - Mazaki, Hiromasa
AU - Ito, Hiroyuki
AU - Ikeda, Yasunori
AU - Takano, Mikio
PY - 1990
Y1 - 1990
N2 - Samples with various compositions, (Bi1-α Pbα)nSr1.0Ca1.0CuYOX, where 0.16≤α≤0.36, n=l.l and 1.2, and 1.50≤Y<1.80, were heated in the temperature range from 840 to 860°C for 24 to 300h. Superconducting properties were studied by the measurements of the dc electrical resistivity as well as the ac magnetic susceptibility. Furthermore, lattice parameters were determined by the powder X-ray diffraction method. For the Pb-rich samples with α≥0.30 heated at 850°C for 120 to 192h, Tc(R=0) was found to be 116K and the Meissner effect was confirmed below 117K. The samples consist mainly of the high-Tc phase, although a small amount of Ca2PbO4 was observed. Tc(R=0) does not exceed 110K for α≤0.24, whereas the samples with α≥0.26 show Tc≥110K. n and Y seem to have no influence upon Tc(R=0). In comparison with the lattice parameters in the Pb-poor samples (α=0.18 and 0.20) with Tc(R=0)~107K, the c axis was found to be longer in the Pb-rich samples with α=0.34 and 0.36 showing Tc(R=0) around 115K, though the a axis was unchanged. The expansion of the c axis may result from an increase in Pb content substituted in the high-Tc phase.
AB - Samples with various compositions, (Bi1-α Pbα)nSr1.0Ca1.0CuYOX, where 0.16≤α≤0.36, n=l.l and 1.2, and 1.50≤Y<1.80, were heated in the temperature range from 840 to 860°C for 24 to 300h. Superconducting properties were studied by the measurements of the dc electrical resistivity as well as the ac magnetic susceptibility. Furthermore, lattice parameters were determined by the powder X-ray diffraction method. For the Pb-rich samples with α≥0.30 heated at 850°C for 120 to 192h, Tc(R=0) was found to be 116K and the Meissner effect was confirmed below 117K. The samples consist mainly of the high-Tc phase, although a small amount of Ca2PbO4 was observed. Tc(R=0) does not exceed 110K for α≤0.24, whereas the samples with α≥0.26 show Tc≥110K. n and Y seem to have no influence upon Tc(R=0). In comparison with the lattice parameters in the Pb-poor samples (α=0.18 and 0.20) with Tc(R=0)~107K, the c axis was found to be longer in the Pb-rich samples with α=0.34 and 0.36 showing Tc(R=0) around 115K, though the a axis was unchanged. The expansion of the c axis may result from an increase in Pb content substituted in the high-Tc phase.
UR - http://www.scopus.com/inward/record.url?scp=0025451270&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0025451270&partnerID=8YFLogxK
U2 - 10.2497/jjspm.37.734
DO - 10.2497/jjspm.37.734
M3 - Article
AN - SCOPUS:0025451270
VL - 37
SP - 734
EP - 738
JO - Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
JF - Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
SN - 0532-8799
IS - 5
ER -