TY - JOUR
T1 - Synthesis and crystal structure of Pb (Ba,Sr)2(Ln,Ce)2Cu3Oy (Ln
T2 - lanthanoid, y=9-10.4), a new member of the Pb system
AU - Tokiwa, A.
AU - Oku, T.
AU - Nagoshi, M.
AU - Shindo, D.
AU - Kikuchi, M.
AU - Oikawa, T.
AU - Hiraga, K.
AU - Syono, Y.
N1 - Funding Information:
The authors thank Drs. T. Kajitani and S. Hosoya for the high oxygen pressure experiment and their thanks are also due to Prof. Y. Muto for warm encouragement.T his work was partly supported by a Grant-in-Aid for Scientific Researcho n Priority Area “Mechanism of Superconductivity” given by the Ministry of Education, Culture and Science, Japan.
PY - 1990/12/1
Y1 - 1990/12/1
N2 - Pb(Ba, Sr)2(Ln, Ce)2Cu3Oy (Ln: lanthanoid, y=9.0-10.4) with (Pb, Cu) double layers and (Ln, Ce) fluorite layers was designed and obtained as a single phase. The structure of Pb(Ba, Sr)2(Ln, Ce)2Cu3Oy, which was derived from Pb(Ba, Sr)2YCu3O y by replacing oxygen-defect Y layers with (Ln, Ce)2O2 layers, was confirmed by high-resolution electron microscopy. The microstructure of (Pb, Cu) double layers of a quenched specimen was examined by means of high-resolution image with an imaging plate. A slowly cooled specimen with an oxygen content of y=10.2 lost 1.2 oxygen atoms above 580°C with an abrupt and reversible transition. The nature of this phase transition was similar to that of PbBaSrYCu3Oy described in our previous paper. No superconductivity was found in Pb(Ba, Sr)2(Ln, Ce)2Cu3Oy in spite of the CuO2 doublet sheets, similar to Pb2Sr2LnCe Cu3Oy with (Ln, Ce) fluorite layers.
AB - Pb(Ba, Sr)2(Ln, Ce)2Cu3Oy (Ln: lanthanoid, y=9.0-10.4) with (Pb, Cu) double layers and (Ln, Ce) fluorite layers was designed and obtained as a single phase. The structure of Pb(Ba, Sr)2(Ln, Ce)2Cu3Oy, which was derived from Pb(Ba, Sr)2YCu3O y by replacing oxygen-defect Y layers with (Ln, Ce)2O2 layers, was confirmed by high-resolution electron microscopy. The microstructure of (Pb, Cu) double layers of a quenched specimen was examined by means of high-resolution image with an imaging plate. A slowly cooled specimen with an oxygen content of y=10.2 lost 1.2 oxygen atoms above 580°C with an abrupt and reversible transition. The nature of this phase transition was similar to that of PbBaSrYCu3Oy described in our previous paper. No superconductivity was found in Pb(Ba, Sr)2(Ln, Ce)2Cu3Oy in spite of the CuO2 doublet sheets, similar to Pb2Sr2LnCe Cu3Oy with (Ln, Ce) fluorite layers.
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U2 - 10.1016/0921-4534(90)90655-X
DO - 10.1016/0921-4534(90)90655-X
M3 - Article
AN - SCOPUS:0025675061
SN - 0921-4534
VL - 172
SP - 155
EP - 165
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - 1-2
ER -