, Volume 19, Issue 4, pp 607-613

Synthesis, structure and IR absorption studies of LnBaCuCoO5 (Ln=rare earth) oxides

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Abstract

A series of oxides LnBaCuCoO5 (Ln=Pr, Nd, Sm, Dy, Gd, Ho and Er) have been synthesized by ceramic method. The oxides crystallize in a tetragonal structure, isostructural to YBaCuCoO5. All the oxides in the series are semiconducting. IR spectra of these oxides show distinct absorption bands at 630 cm−1, 550 cm−1 and 330 cm−1 which are assigned toE,A 2 andA 1 modes respectively. Doping of holes in these oxides, by calcium substitution in Er1−x Ca x BaCuCoO5−x (up tox ⋍ 0·3) was done but, these oxides did not show metallic behaviour.

Contribution no 1175 from Solid State and Structural Chemistry Unit.