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Journal of Materials Science

, Volume 41, Issue 21, pp 7119–7129 | Cite as

Structural characterization of a novel spatially coherent crystalline nanocomposite obtained from a melt of KBr, RbCl, RbBr, KI and RbI salts

  • A. E. Cordero-Borboa
  • R. R. Mijangos
  • P. S. Schabes-Retchkiman
Article

Abstract

Large transparent bulks, grown by a pulling technique from a melt prepared by mixing equal molar fractions of KBr, RbCl, RbBr, KI and RbI salts, are characterized by X-ray diffractometry, Laue photography and low-current-field-emission high-resolution electron microscopy. The bulks consist of a multiphase crystalline material made of nanocrystallites (with a size distribution range of 5–60 nm) of three different fcc-phases. One of these phases is identified as single RbBr while the other two are discussed to be binary KI(39%):RbI(61%) and ternary KBr(47%):RbCl(39%):RbBr(14%), respectively, with unit-cell sizes of 6.889 ± 0.007, 7.234 ± 0.025 and 6.631 ± 0.005 Å, respectively. The lattices of the crystallites, no matter the particular phase they belong to, are spatially coherent to each other so that the normal vectors to a lattice (HKL)-plane, in different crystallites, are confined in the space within a narrow circular cone around the lattice [HKL]-direction. For this cone, the semi-apical angle was determined for the cases of HKL equal to 301, 411, 331, 401, 311, 511, 221 and 321. The ternary phase crystallites contribute mainly to the observed departure of the composite crystallographic texture from a condition of full spatial coherence.

Keywords

RbCl Crystallographic Texture Alkali Halide RbBr Card Line 

Notes

Acknowledgements

The authors wish to thank Prof. José Manuel Hernández for his advice on mixed crystals, Prof. Héctor Riveros Rotge and Mr. Ricardo Guerrero for growing the crystals, Mr. Luis Rendón for his aid on electron microscopy, Mr. R. Unda-Angeles for preparing the figures, Ing. Samuel Tehuacanero for his advice on image treatment and Dr. Miguel Cervantes for taking the picture shown in Fig. 1.

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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • A. E. Cordero-Borboa
    • 1
  • R. R. Mijangos
    • 2
  • P. S. Schabes-Retchkiman
    • 1
  1. 1.Instituto de FísicaUniversidad Nacional Autónoma de MéxicoMéxico DFMéxico
  2. 2.Centro de Investigación en FísicaUNISONHermosilloMéxico

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