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Crystallographic study of mixture Ba 0.6 Nd 0.4 CuO y , in the range of annealing temperatures 860 o - 910 o C

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posted on 08.02.2016, 15:37 by Danis Kerasiotis
A powder mixture of BaCO3, Nd2O3 and CuO was prepared according to the chemical formula Ba0.6Nd0.4CuOy. The mixture was heated successively for several hours (52 to 75h) in free atmosphere at temperatures 860 oC, 870 oC, 880 oC, 890 oC, 900 oC and 910 oC. The products were cooled at room temperature and measured by an X-Ray powder diffractometer with Bragg-Brentano geometry and CuKα radiation. Each of the samples was characterized with the help of the “Powder Diffraction File” (PDF). The initial crystal structure parameters of found crystalline phases were taken from ICSD data base and refined, using the Rietveld’s method, “Powder Profile Analysis”. The refinement took place progressively, with constant temperature factors for all atoms. Six phases were found for whole of the samples: A=Ba1.78Nd1.22Cu3O6.70, B=BaCO3, C=BaCuO2, D=BaCuNd2O5, E=CuO, F=Nd2CuO4. All phases, except the A, decrease progressively and disappear in 910 oC. The phase A is the main phase, and is the unique phase in the sample of 910 oC. Its space group is P4/mmm and the mean unit cell constants are a=b=3.893 Å, c=11.690 Å. The percentage of the main phase varies from 38.78% to 100% (w/w), as the temperature increases from 860 oC to 910 oC.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS

Citation

KERASIOTIS, I., 2007. Crystallographic study of mixture Ba 0.6 Nd 0.4 CuO y , in the range of annealing temperatures 860 o - 910 o C. Journal of Optoelectronics and Advanced Materials, 9(9), pp. 2799 - 2803.

Publisher

© Journal of Optoelectronics and Advanced Materials

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2007

Notes

This paper was Published in the journal Journal of Optoelectronics and Advanced Materials and the definitive published version is available at : http://joam.inoe.ro/index.php?option=magazine&op=view&idu=912&catid=17

ISSN

1454-4164

Language

en