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A Comparison between the Raman Spectra of Ce1−xCaxVO4−0.5x (0≤x≤0.41) and Ce1−xBixVO4 (0≤x≤0.68)

✍ Scribed by T. Hirata; A. Watanabe

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

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✦ Synopsis

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 remarkable di4erence in that the three broad features appeared in the Raman spectra of Ce 1؊x Ca x VO 4+0.5x whereas they were absent for Ce 1؊x Bi x VO 4 . The appearance of the broad features could be attributed to the 99charge transfer:: e4ect on the aliovalent Ca 2؉ substitution, which is responsible for a substantial enhancement in electrical conductivity in Ce 1؊x Ca x VO 4+0.5x relative to Ce 1؊x Bi x VO 4 with x. From the changes in the modes: frequency with unit-cell volume, which exhibit a di4erent decrease with x between Ce 1؊x Ca x VO 4+0.5x and Ce 1؊x Bi x VO 4 , we could estimate mode GruK neisen parameters that vary in magnitude and/or sign as well as between Ce 1؊x Ca x VO 4+0.5x and Ce 1؊x Bi x VO 4 ; this re6ects the fact that di4erent lattice distortions are induced when aliovalent or isovalent cations with similar/di4erent ionic radii are substituted to form both the solid solutions.

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