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

doi:10.1021/cg050519c

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 journal › Article › peer-review

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 language	English
Pages (from-to)	1761-1765
Number of pages	5
Journal	Crystal Growth and Design
Volume	6
Issue number	8
DOIs	https://doi.org/10.1021/cg050519c
Publication status	Published - 2006 Aug
Externally published	Yes

ASJC Scopus subject areas

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

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10.1021/cg050519c

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title = "Growth and structural characterization of needlelike crystals in the Y-Ba-Cu-O system",

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.",

author = "P. Mele and A. Ubaldini and Carnasciali, {M. M.} and Costa, {G. A.} and M. Scavini",

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T1 - Growth and structural characterization of needlelike crystals in the Y-Ba-Cu-O system

AU - Mele, P.

AU - Ubaldini, A.

AU - Carnasciali, M. M.

AU - Costa, G. A.

AU - Scavini, M.

PY - 2006/8

Y1 - 2006/8

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AB - 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.

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

Abstract

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