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Identification of Nd163 phase in melt-textured NdBa2Cu3O7−δ bulk samples

Published online by Cambridge University Press:  31 January 2011

Marcello Gombos ,
Vicente Gomis ,
Anna Esther Carrillo ,
Antonio Vecchione ,
Sandro Pace  and
Xavier Obradors
Marcello Gombos*
Affiliation:
INFM-coherentia and Università degli Studi di Salerno, Dipartimento di Fisica E. R. Caianiello, Baronissi (SA) Italy
Vicente Gomis
Affiliation:
Universitat Politecnica de Catalunya, Barcelona, Catalunya, Spain
Anna Esther Carrillo
Affiliation:
Institut de Ciencia de Materials de Barcelona, CSIC, Bellaterra, Catalunya, Spain
Antonio Vecchione
Affiliation:
INFM-coherentia and Università degli Studi di Salerno, Dip. di Fisica E. R. Caianiello, Baronissi (SA) Italy
Sandro Pace
Affiliation:
INFM U.dR SA and Università degli Studi di Salerno, Dipartimento di Fisica E. R. Caianiello, Baronissi (SA) Italy
Xavier Obradors
Affiliation:
Institut de Ciencia de Materials de Barcelona, CSIC, Bellaterra, Catalunya, Spain
*
a) Address all correspondence to this author. e-mail: gombos@libero.it and gombos@sa.infn.it
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Abstract

In this work, we report on the observation of Nd1Ba6Cu3O10,5 (Nd163) phase of the NdBaCuO system in melt-textured Nd123 bulk samples grown from a mixture of Nd123 and Nd210 phase powders. The observation was performed with polarized light optical microscopy and scanning electron microscopy–energy dispersive x-ray analyses. Images of the identified phase crystals show an aspect quite different from Nd422 crystals. Unexpectedly, Nd163 was individuated, even in “pure” Nd123 samples. Moreover, after long exposure to air, Nd163 disappeared completely in samples synthesized from powders containing Nd210. Thermogravimetry analyses of powders show that the stability of this phase in air is limited to temperatures higher than 900 °C, so Nd163 is unstable and highly reactive at room temperature. Moreover, an explanation of the observation of Nd163 in Nd210 free samples, based on the spontaneous formation of Nd163 phase in a Nd123 melt, is proposed.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 9 , September 2003 , pp. 2050 - 2054
Copyright
Copyright © Materials Research Society 2003

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References

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