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Title of Journal: J Supercond Nov Magn

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Abbravation: Journal of Superconductivity and Novel Magnetism

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Springer US

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DOI

10.1007/978-3-319-17076-3_7

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ISSN

1557-1947

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Physical and Mechanical Properties of GdBaSubscri

Authors: R Awad A I Abou Aly N H Mohammed H A Motaweh D ElSaid Bakeer
Publish Date: 2014/02/09
Volume: 27, Issue: 7, Pages: 1757-1767
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Abstract

Superconductor samples of type CoFe2O4 x GdBa2Cu3O7−δ 00≤x≤01 wt were synthesized by the conventional solidstate reaction technique The prepared samples were investigated using Xray diffraction XRD scanning electron microscope SEM electrical resistivity AC magnetic susceptibility and Vickers microhardness Phase examination by XRD indicated that the orthorhombic structure of Gd123 is not affected by nanosized ferrite CoFe2O4 addition whereas the volume fraction of Gd123 increased with x up to 001 wt Morphological investigations by SEM revealed that the porosity among grains decreased as x increased from 00 to 01 wt The superconducting transition temperature T c was estimated from electrical resistivity and the AC magnetic susceptibility measurements A reduction in T c was observed as x increased from 00 to 01 wt consisting with the effect of adding magnetic impurities to HTSCs Room temperature microhardness measurements were carried out at different applied loads 05–10 N for the study of the mechanical performance of the studied samples The experimental results were analyzed using Meyer’s law Hays–Kendall approach elastic/plastic deformation model and proportional specimen resistance model The results showed that all the samples exhibited normal indentation size effect and Vickers microhardness values were increased as nanosized CoFe2O4 addition increased The analysis showed that the proportional specimen resistance model is the best model for computing the loadindependent microhardness values of our samples

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