Growth and characterization of REBa2Cu3O7-δsuperconductor single crystals obtained from xenotime mineral

  • Jurelo A
  • Flemming J
  • Serbena F
 et al. 
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Abstract

Single crystals of REBa2Cu3O7-δ(RE=natural mixture of Y and heavy lanthanides in the single crystals) superconductor were successfully grown using rare-earth oxides extracted from xenotime mineral, allowing an alternative and simple route for superconductor single-crystal production. The methodology to extract the rare-earth mixed oxides from the xenotime mineral has three main steps: alkaline fusion, acid lixiviation and oxalic precipitation. Large single crystals with a typical 5×5×0.03 mm3size were obtained by using a CuO-BaO self-flux and were characterized by scanning electron microscopy (SEM), energy-dispersive electron spectroscopy, X-ray diffraction, magnetic measurements and nanoindentation. The composition of the rare-earth elements of the crystal was different from the starting mixture, possibly due to the different solubilities of the elements in the melt. The final crystal stoichiometry was RE:Ba:Cu=1:2:3. X-ray diffraction analysis showed highly oriented c-axis (c=11.716±0.002 Å). The critical temperature was determined to be around TC≅88-89 K after the crystals have been submitted to oxygen annealing. Hardness and elastic modulus for ab- and b(a)c-planes were 8.5±0.5 and 160±20 GPa, respectively. © 2009 Elsevier B.V. All rights reserved.

Author-supplied keywords

  • A1. Characterization
  • A2. Single crystal growth
  • B1. Cuprates
  • B2. Oxide superconducting material

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Authors

  • Alcione Roberto Jurelo

  • Júlio Flemming

  • Francisco Carlos Serbena

  • Célia Regina Carubelli

  • Pedro Rodrigues

  • Carlos Eugênio Foerster

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