NDLI: Synthesis, X-ray structure analysis, and Raman spectroscopy of R$_{2}$TiO$

Content Provider	Springer Nature Link
Author	Lyashenko, L. P. Shcherbakova, L. G. Karelin, A. I. Smirv, V. A. Kulik, E. S. Svetogorov, R. D. Zubavichus, Ya. V.
Copyright Year	2016
Abstract	Order–disorder transitions in xR$_{2}$O$_{3}$ · (1 − x)TiO$_{2}$ (R = Sc, 0.4 ≤ x ≤ 0.5; R = Y, 0.5 ≤ x ≤ 0.6) solid solutions with highly imperfect fluorite-derived structures have been studied using monochromatic synchrotron X-ray diffraction and Raman spectroscopy. The results demonstrate that the synthesis process leads to the formation of a fluorite-like (Fm3m) disordered phase and a nanoscale (~10–100 nm) pyrochlore-like (Fd3m) ordered phase of the same composition, coherent with the disordered phase. We have determined their lattice parameters. The Raman spectra of Sc$_{2}$TiO$_{5}$ (Y$_{2}$TiO$_{5}$) contain broad lines in low- and high-frequency regions: at 190, 350, and 775 (134, 188, 365, 404, and 727) cm$^{−1}$. These lines are characteristic of a pyrochlore-like phase with a varying degree of order and a disordered fluorite-like phase, respectively. The pyrochlore-like phase Y$_{2}$Ti$_{2}$O$_{7}$ has two strong Raman peaks in the low-frequency region: at 312 and 527 cm$^{−1}$. The formation of nanodomains with different degrees of order is caused by the internal stress that arises from the high density of structural defects in the unit cells of the solid solutions.
Starting Page	483
Ending Page	489
Page Count	7
File Format	PDF
ISSN	00201685
Journal	Inorganic Materials
Volume Number	52
Issue Number	5
e-ISSN	16083172
Language	English
Publisher	Pleiades Publishing
Publisher Date	2016-05-13
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	synchrotron X-ray diffraction Raman spectra fluorite- and pyrochlore-like Sc(Y)$_{2}$TiO$_{5}$-based solid solutions Inorganic Chemistry Industrial Chemistry/Chemical Engineering Materials Science
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Metals and Alloys Chemical Engineering Inorganic Chemistry

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