Growth and structural characterization of needlelike crystals in the Y-Ba-Cu-O system

P. Mele, A. Ubaldini, M. M. Carnasciali, G. A. Costa, M. Scavini

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A system formed by a bar of Y2BaCuO5 (Y211) phase supported on two YBa2Cu3O1 (Y123) pellets was processed by thermal treatment at high temperature. The first effect was a change in chemical composition inside the bar, yielding new phases: mostly Y123 and BaCuO2. Their concentrations were higher near the bar ends. A second, very interesting result was the growth of two kinds of acicular crystals underneath the whole bar: green, transparent Y211 needles and needles with a green core of Y211, covered by a Y123 layer. Micro Raman and SEM analyses clearly identified the two different phases. XRD inspection has confirmed that Y211 crystals are high-quality single crystals. The preferential growth direction for Y211 needles is along the crystallographic b axis. A possible explanation, based on the VLS mechanism, for their growth is suggested.

Original languageEnglish
Pages (from-to)1761-1765
Number of pages5
JournalCrystal Growth and Design
Volume6
Issue number8
DOIs
Publication statusPublished - 2006 Aug 1

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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