Abstract
Abstract In this paper, the synthesis of the La3Ba5Cu8O18-δ and Sm3Ba5Cu8O18-δ superconductors using the combustion method is reported for the first time. Besides, a comparison with the solid-state reaction method was performed. The materials were synthesized at 870 °C for 24 h under oxygen flow. Rietveld refinement showed materials with the main crystal phase corresponding to the orthorhombic structure of space-group Pmm2 (25), with purity in the range 51-85%, which had not reported for the RE358 systems. On the other hand, the magnetic measurements under external fields (30 and 100 Oe) confirmed the diamagnetic response associated with the Meissner effect, and Tc values between 24 and 58 K.
Highlights
The YBCO family of superconductors is constituted by the materials YBa2Cu3O7-δ (Y123) with a critical temperature (Tc) of 90 K1,2, YBa2Cu4O8 (Y124), Y2Ba4Cu7O15 (Y247) and Y3Ba5Cu8O18 (Y358), which differ on the number of CuO2 planes and CuO chains[3]
Y123 superconductor is constituted by two CuO2 planes and a CuO chain, Y124 by a double CuO chain, while Y247 has a CuO2 plane and a double CuO chain
The X-ray diffraction (XRD) patterns of the samples were similar, with a slight shift of peaks towards higher 2θ angles. This is attributed to the distortion of the unit cell generated by the difference between the ionic radius of Sm3+ (1.04 Å) and La3+ (1.16 Å), the main XRD peak shifted from 38,01° 2θ (La358) to 38,33° 2θ (Sm358) for the samples obtained by the combustion method, and from 38,00° 2θ (La358) to 38,28° 2θ (Sm358) for those obtained by the solid-state reaction method
Summary
The YBCO family of superconductors is constituted by the materials YBa2Cu3O7-δ (Y123) with a critical temperature (Tc) of 90 K1,2, YBa2Cu4O8 (Y124), Y2Ba4Cu7O15 (Y247) and Y3Ba5Cu8O18 (Y358), which differ on the number of CuO2 planes and CuO chains[3]. These superconductors have electronic and magnetic applications, such as electric motors, particle accelerators, magnetic levitation devices, and cables[4]. The Y358 superconductor is similar to Y123, has five CuO2 planes and three CuO chains per unit cell. The greater number of planes and chains in the Y358 system generates an increase in the Tc due to a greater amount of electron pairs[7,8]
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