TY - JOUR
T1 - Synthesis and superconductivity of oxycarbonates of the Tl-1201 phase
AU - Kikuchi, M.
AU - Ohshima, E.
AU - Ohnishi, N.
AU - Muraoka, Y.
AU - Nakajima, S.
AU - Aoyagi, E.
AU - Ogawa, M.
AU - Akimitsu, J.
AU - Oku, T.
AU - Hiraga, K.
AU - Syono, Y.
N1 - Funding Information:
The authors are grateful to Y. Hayasaka, high-voltage electron microscopic center, Tohoku University, for technical supports, and H. Yamane, T. Atou and Y. Miyazaki, IMR Tohoku University, for helpful discussions. This work was partly supported by a Grant-in-Aid for Scientific Research on Priority Areas, "Science of High-Tc Superconductivity" given by the Ministry of Education, Science and Culture, Japan.
PY - 1994/1/1
Y1 - 1994/1/1
N2 - TlBaxSr4-xCu2(CO3)Oy oxycarbonates with the Tl-1201 structure were synthesized over a wide range of x (1.0≤x ≤3.2) and examined by X-ray powder diffraction, electron diffraction, high-resolution electron microscopy and magnetometry methods. New phases with the Tl-1201 structure having 6 and 7 times periodicities along the b-axis were isolated. The former was stable for a wide Ba-rich range (1.8≤x≤3.2), and the latter was observed for a smaller Ba content range (1.2≤x≤1.6). The phase stability was found to depend on the synthesis condition. The maximum Tc of the as-synthesized specimen in this series occurred at about 70 K around x=2.0. The Meissner volume fraction of the as-synthesized specimen (x=2.4) was 30% at 5 K.
AB - TlBaxSr4-xCu2(CO3)Oy oxycarbonates with the Tl-1201 structure were synthesized over a wide range of x (1.0≤x ≤3.2) and examined by X-ray powder diffraction, electron diffraction, high-resolution electron microscopy and magnetometry methods. New phases with the Tl-1201 structure having 6 and 7 times periodicities along the b-axis were isolated. The former was stable for a wide Ba-rich range (1.8≤x≤3.2), and the latter was observed for a smaller Ba content range (1.2≤x≤1.6). The phase stability was found to depend on the synthesis condition. The maximum Tc of the as-synthesized specimen in this series occurred at about 70 K around x=2.0. The Meissner volume fraction of the as-synthesized specimen (x=2.4) was 30% at 5 K.
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U2 - 10.1016/0921-4534(94)90035-3
DO - 10.1016/0921-4534(94)90035-3
M3 - Article
AN - SCOPUS:43949152729
VL - 219
SP - 200
EP - 204
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - 1-2
ER -