Rao, C N R; Nagarajan, R; Mahesh, R; Kulkarni, G U; Ayyappan, S; Subbanna, G N
(Pergamon-Elsevier Science Ltd, 1993-12)
When the Cu(1) site in orthorhombic YBaSrCu3O7−δ (Tc = 80 K), is partly substituted by the carbonate ion (upto 50%), the crystal structure becomes tetragonal and the electron diffraction pattern shows evidence for 2a × 2c ...