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Title: Structure and Physical Properties of the LnBa2Cu2MO7+� System (Ln = Rare Earth and Y; M = Ga, Co)
Authors: Mary, T.A.
Kumar, N.R.S.
Varadaraju, U.V.
Issue Date: 1993
Citation: Journal of Solid State Chemistry, 107(2), 524-538
Abstract: A series of compounds with the general formula Ln Ba2Cu2GaO7+� (Ln = La-Gd, Y) and LnBa2Cu2 CoO7+� (Ln = La-Yb, Y) have been synthesized and characterized. The phase formation is found to be sensitive to the size of the rare earth ion in both the series. For Ln = La-Eu, the Ga-substituted compounds are single phase and possess tetragonal Y-123 structure. In the Ln Ba2Cu2CoO7+� series, single-phase formation is noted for all the Ln's studied except Yb. An orthorhombic-to-tetragonal transition occurs across the rare earth series. For Ln = La-Er and Y, the phases are orthorhombic, and for Ln = Tm the phase is tetragonal. Oxygen content of the phases is found to be ?7.0 for the LnBa2Cu2GaO7+� series, whereas for the LnBa2Cu2CoO7+� system, the value increases to ?7.25 as expected. Electrical resistivity studies show that all the phases are semiconducting with activation energies in the range 0.03-0.28 eV. IR spectra and magnetic susceptibility of select compounds have been studied and discussed. ? 1993 Academic Press. All rights reserved.
ISSN: 224596
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