Journal of the Society of Inorganic Materials, Japan
Online ISSN : 2185-4378
ISSN-L : 1345-3769
Preparation of RBa2Cu3Oy (R=Y, La, Nd, Sm, Eu, Gd, Dy, Ho, Er and Yb) Superconductors Using a Microwave Oven
Kazutada KAWANOKaori NAITOUToshimasa TAKAOMasato OHTAKatsuhiko HIRANOTakayasu KIMURA
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2002 Volume 9 Issue 301 Pages 511-516


The rapid preparation of a series of RBa2Cu3Oy (R=Y, La, Nd, Sm, Eu, Gd, Dy, Ho, Er and Yb) superconductors on the microwave processing was studied. All of the RBa2Cu3Oy superconductors were prepared as orthorhombic compounds and it was found that these compounds, except for the case of La, have revealed the superconductivities with the superconducting transitions, (Tcmag), ranging from 83 to 93 K. The Tcmag for compounds RBa2Cu3Oy (R=Dy, Y and Ho) remained essentially constant at 93 K, independent of R. However, the Tcmag decreased with increasing R radius andwith decreasing R radius. Further we have attempted to prepare NdxYb1-xBa2Cu3Oy of two rare earth elements with different ionic radii and also have investigated the superconducting properties of the synthesized compounds in various compositions of x (0≤x≤1). The cell parameters showed linear dependence on the composition (x). In the range of x=0.2-0.4, a homogeneous phase superconductor with Tcmag=93 K was formed, while for the range of x≥0.5, the Tcmag clearly decreased with increasing x and reached a value of 83 K in the sample with composition of NdBa2Cu3Oy.

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