Order–Disorder Structural Transformations in Nanocrystalline Highly Imperfect Gd2MO5 (M = Zr and Hf) Fluorite Derivatives

Order–Disorder Structural Transformations in Nanocrystalline Highly Imperfect Gd2MO5 (M = Zr... Order–disorder phenomena in nanocrystalline Gd2ZrO5 and Gd2HfO5 with highly imperfect fluorite- derived structures in the range 1000–1600°C have been studied using monochromatic synchrotron X-ray diffraction and Raman spectroscopy. The results demonstrate that the synthesis process leads to the formation of two coherent phases identical in composition: a nanocrystalline disordered fluorite-like (F) phase (Fm3m) and a nanoparticulate ordered fluorite derivative (C 1) (Ia3). Their lattice parameters have been determined. In the range 1000–1600°C, the Raman spectra of the Gd2ZrO5 and Gd2HfO5 materials contain broad bands in low- and high-frequency regions, at ~118 (108), 362 (353), and 670 (665) cm–1, which characterize the C 1 and F phases, respectively. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Inorganic Materials Springer Journals

Order–Disorder Structural Transformations in Nanocrystalline Highly Imperfect Gd2MO5 (M = Zr and Hf) Fluorite Derivatives

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Publisher
Pleiades Publishing
Copyright
Copyright © 2018 by Pleiades Publishing, Ltd.
Subject
Chemistry; Inorganic Chemistry; Industrial Chemistry/Chemical Engineering; Materials Science, general
ISSN
0020-1685
eISSN
1608-3172
D.O.I.
10.1134/S0020168518030093
Publisher site
See Article on Publisher Site

Abstract

Order–disorder phenomena in nanocrystalline Gd2ZrO5 and Gd2HfO5 with highly imperfect fluorite- derived structures in the range 1000–1600°C have been studied using monochromatic synchrotron X-ray diffraction and Raman spectroscopy. The results demonstrate that the synthesis process leads to the formation of two coherent phases identical in composition: a nanocrystalline disordered fluorite-like (F) phase (Fm3m) and a nanoparticulate ordered fluorite derivative (C 1) (Ia3). Their lattice parameters have been determined. In the range 1000–1600°C, the Raman spectra of the Gd2ZrO5 and Gd2HfO5 materials contain broad bands in low- and high-frequency regions, at ~118 (108), 362 (353), and 670 (665) cm–1, which characterize the C 1 and F phases, respectively.

Journal

Inorganic MaterialsSpringer Journals

Published: Mar 14, 2018

References

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