The rapid preparation of a series of RBa
2Cu
3O
y (R=Y, La, Nd, Sm, Eu, Gd, Dy, Ho, Er and Yb) superconductors on the microwave processing was studied. All of the RBa
2Cu
3O
y 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 RBa
2Cu
3O
y (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 Nd
xYb
1-xBa
2Cu
3O
y 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 NdBa
2Cu
3O
y.
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