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Substitution effects on the ruthenium, strontium and gadolinium sites in the RuSr2GdCu2O8 compound.

Published online by Cambridge University Press:  01 February 2011

E. Chavira ,
M. Abatal ,
C. Filippini ,
J. L. Tholence ,
V. García-Vázquez ,
J. C. Pérez ,
A. Sulpice  and
Henri Noël
E. Chavira
Affiliation:
IIM-UNAM, AP 70–360, 04510, MEXICO
M. Abatal
Affiliation:
IIM-UNAM, AP 70–360, 04510, MEXICO
C. Filippini
Affiliation:
LEPES-CNRS, 25, Av. Des Martyrs B. P. 166 38042 Grenoble, FRANCE
J. L. Tholence
Affiliation:
LEPES-CNRS, 25, Av. Des Martyrs B. P. 166 38042 Grenoble, FRANCE
V. García-Vázquez
Affiliation:
IF-LRT, BUAP, AP J-48, 72570 Puebla, MEXICO
J. C. Pérez
Affiliation:
IF-LRT, BUAP, AP J-48, 72570 Puebla, MEXICO
A. Sulpice
Affiliation:
CRTBT-CNRS, 25, Av. Des Martyrs B. P. 166 38042 Grenoble, FRANCE
Henri Noël
Affiliation:
LCSIM-CNRS, Av. du Général Leclere, 35042 Rennes, FRANCE.
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Abstract

We present the more relevant results of various cationic substitutions in the RuSr2GdCu2O8 (Ru-1:2:1:2 ) compound. The substitutions were synthesized by solid-state reaction at ambient pressure in the following systems: Ru1−xSr2GdCu2+xO8 (0.0 < x < 1.0), Ru(Sr2-xCax)GdCu2O8 (0 < x < 2.0) and RuSr2(Gd1-xLnx)Cu2O8 (0 < x < 0.9) with Ln = Dy, Ho, Er, Yb and Lu. All of them were isostructural to Ru-1:2:1:2 compound with tetragonal unit cells. The phases have been characterized by X-Ray powder Diffraction (XRD), observing a solid solution (ss ) up to x = 0.4 for Ru ions replaced by Cu ions, x = 0.1 when we substitute Sr atoms by Ca atoms, and x = 0.7 changing Gd ions by Ln ions. As a result of the Scanning Electron Microscopy (SEM), the grain sizes were discovered to be 1 – 10 μm. The Energy Dispersive X-ray spectroscopy (EDX) analysis permitted us to analyze the impurities that we did not detect with XRD. We observed semiconducting, isolated and ferromagnetic behaviors. No superconducting transition could be observed for these ambient preparation conditions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 848: Symposium FF – Solid-State Chemistry of Inorganic Materials V , 2004 , FF6.22
Copyright
Copyright © Materials Research Society 2005

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References

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