Influence of y substitution in gd2-xyxfe17 compounds
Artículo de revista
2014
Universidad de la Costa CUC
Gd2−xYxFe17 (x = 0; 0.6; 1.0) compounds were prepared by standard arc melting
method. Thereafter, samples were subjected to annealing for two days at T=1273 K,
finishing with quenching to 273 K. The samples were cut into small portions to
perform structural, electrical, and thermal characterization. Heat flow and Curie
temperature (Tc) arise from measurements of thermal properties through Differential
Scanning Calorimetry (DSC), structural properties were tested via X-ray diffraction
(XRD) at T=273 K, electrical characterization was carried out through the Impedance
Spectrometry (IS) method, upon zero applied magnetic field and temperature range
between 300 K<T<500 K. Results show that Tc decreases when Y concentration
increases. Tc is obtained as the maximum temperature variation of heat flux. The
Gd2Fe17 compound shows two endothermic heat flux peaks; this fact can be
attributed to not identifying an impurity phase from X-ray diffraction measurements.
From Rietveld refined data, the crystal structure for all compounds is established,
resulting in a hexagonal Th2Ni17-type structure. Measurements of impedance
spectrometry as function of frequency were analyzed in terms of equivalent circuit
method, finding that for temperatures below Tc they fit according to the model
composed of one RL and two RC parallel circuits, in contrast to temperatures above
Tc given by the model that consists of only two RC parallel circuits.
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INFLUENCE OF Y SUBSTITUTION IN GD2-XYXFE17 COMPOUNDS.pdf
Título: INFLUENCE OF Y SUBSTITUTION IN GD2-XYXFE17 COMPOUNDS.pdf
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Título: INFLUENCE OF Y SUBSTITUTION IN GD2-XYXFE17 COMPOUNDS.pdf
Tamaño: 65.08Kb
PDFLEER EN FLIP