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Ball milling-induced pyrochlore-to-tungsten bronze phase transition in RbNbWO6

Published online by Cambridge University Press:  31 January 2011

Janete E. Zorzi ,
Cintia L.G. de Amorim ,
Raquel Milani ,
Carlos A. Figueroa ,
J.A.H. da Jornada  and
Claudio A. Perottoni
Carlos A. Figueroa
Affiliation:
Universidade de Caxias do Sul, 95070-560 Caxias do Sul–RS, Brazil
J.A.H. da Jornada
Affiliation:
Inmetro, 25250-020 Xerém, Duque de Caxias–RJ, Brazil; and Universidade Federal do Rio Grande do Sul, Instituto de Física, 91501-970 Porto Alegre–RS, Brazil
Claudio A. Perottoni*
Affiliation:
Universidade de Caxias do Sul, 95070-560 Caxias do Sul–RS, Brazil; and Universidade Federal do Rio Grande do Sul, Instituto de Física, 91501-970 Porto Alegre–RS, Brazil
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

A set of Bragg peaks consistent with a hexagonal Bravais lattice was observed in the x-ray powder diffraction pattern of cubic pyrochlore rubidium tungstoniobate (RbNbWO6) subjected to high-energy ball milling. The calculated lattice parameters for this hexagonal phase are similar to those of compounds with tungsten bronze structure. In fact, the powder pattern of the hexagonal phase could be refined with a structural model based on the tungsten bronze structure. The hexagonal phase produced by high-energy ball milling of RbNbWO6 transforms back to the pyrochlore structure upon heating to 773 K in air. A similar phase was obtained by ball milling the mixture RbNbWO6 + WO3, but, in this case, the stoichiometric hexagonal tungsten bronze compound thus obtained remained stable up to 1273 K.

Keywords

Phase transformationReactive ball millingX-ray diffraction (XRD)
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 6 , June 2009 , pp. 2035 - 2041
Copyright
Copyright © Materials Research Society 2009

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