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Raman and Infrared Spectroscopic Study of Ce1−xMxVO4−0.5x (M=Pb, Sr, and Ca) and Ce1−xBixVO4 Solid Solutions

✍ Scribed by T. Hirata; A. Watanabe

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
316 KB
Volume
158
Category
Article
ISSN
0022-4596

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✦ Synopsis

Raman and infrared spectroscopic studies of Ce 1؊x M x VO 4؊0.5x (M ‫؍‬ Pb, Sr, and Ca) and Ce 1؊x Bi x VO 4 solid solutions have been performed. When aliovalent or isovalent cations with similar/ di4erent ionic radii were substituted for Ce in CeVO 4 to form the substitutional solid solutions, it was found that the valence and/or ionic radii of the substitutes dominated the solid solubility limit, producing di4erent lattice parameter changes/distinctive spectral features with x in Ce 1؊x M x VO 4؊0.5x and Ce 1؊x Bi x VO 4 . Particularly, the substitution of aliovalent cations, which causes a change in oxygen stoichiometry to preserve the charge neutrality, led to the emergence of several broad bands in the Raman spectra of Ce 1؊x M x VO 4؊0.5x whereas they were absent in Ce 1؊x Bi x VO 4 . The x-dependence of frequency, linewidth, and intensity of the Raman/infrared modes is presented and discussed in order to draw a spectroscopic distinction between Ce 1؊x M x VO 4؊0.5x and Ce 1؊x Bi x VO 4 solid solutions.

📜 SIMILAR VOLUMES

Highly Conductive Oxides, CeVO4, Ce1−xMx
Highly Conductive Oxides, CeVO4, Ce1−xMxVO4−0.5x(M=Ca, Sr, Pb) and Ce1−yBiyVO4, with Zircon-Type Structure Prepared by Solid-State Reaction in Air
✍ Akiteru Watanabe 📂 Article 📅 2000 🏛 Elsevier Science 🌐 English ⚖ 190 KB

The zircon-type phases, CeVO 4 , Ce 1؊x M x VO 4؊0.5x (04x40.41 for M ‫؍‬ Ca, 04x40.21 for M ‫؍‬ Sr, and 04x40.1 for M ‫؍‬ Pb) and Ce 1؊y Bi y VO 4 (04y40.68), have been prepared in air by heating the stoichiometric mixture of CeO 2 , V 2 O 5 , CaCO 3 , SrCO 3 , PbO, and Bi 2 O 3 . During solidstate

A Comparison between the Raman Spectra o
A Comparison between the Raman Spectra of Ce1−xCaxVO4−0.5x (0≤x≤0.41) and Ce1−xBixVO4 (0≤x≤0.68)
✍ T. Hirata; A. Watanabe 📂 Article 📅 2001 🏛 Elsevier Science 🌐 English ⚖ 305 KB

The Raman spectra of Ce 1؊x Ca x VO 4+0.5x (04x40.41) and Ce 1؊x Bi x VO 4 (04x40.68) solid solutions, where aliovalent Ca 2؉ or isovalent Bi 3؉ cations are substituted for Ce 3؉ in the tetragonal cerium vanadate CeVO 4 , are presented as a function of x to compare with each other. There was a remar