Issue 18, 2000
From the journal:

Physical Chemistry Chemical Physics

Structure of vanadate in calcium phosphate and vanadate apatite solid solutions

Carlos Bauer Boechat,a   Jean-Guillaume Eon,b   Alexandre Malta Rossi,c   Carlos André de Castro Perezd  and  Rosane Aguiar da Silva San Gile  

a Instituto de Química, Uniersidade Federal Fluminense, Rio de Janeiro, Brazil

b Instituto de Química, Uniersidade Federal do Rio de Janeiro, Cidade Uniersitária, Ilha do Fundão, Rio de Janeiro, Brazil
E-mail: jgeon@iq.ufrj.br

c Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro, Brazil

d Núcleo de Catálise, Programa de Engenharia Química, Uniersidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil

e Departamento de Química Orgânica, Instituto de Química, Uniersidade Federal do Rio de Janeiro, Departamento de Ciências Naturais, Uniersidade do Rio Janeiro, Brazil

Abstract

Polycrystalline solid solutions of phosphate and vanadate calcium apatites were synthesized and studied by XRD, XPS, 31P and 51V NMR, FTIR and UV spectroscopies. Homogeneous distributions of vanadium within the solid and the surface were obtained. While 51V NMR spectra suggest an axial symmetry of the vanadate group, FTIR spectra indicate distortion from essentially C3v symmetry in solid solutions with low vanadium content to Cs for pure vanadate apatite, in agreement with the site symmetry group of phosphate in hydroxyapatite. Refinements of XRD pattern of vanadate apatite by Rietveld method confirm the Cs point group attribution. Three vanadium oxygen bond lengths were found around 168 pm and one close to 174 pm, suggesting that the Cs point group could be generated by a small distortion from C3v symmetry. Analysis of UV spectra confirms that distortion from Td symmetry increases with vanadium content and suggests some contraction of the vanadate ion in the apatite lattice.

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Article information

DOI
https://doi.org/10.1039/B004339G
Article type
Paper
Submitted
30 May 2000
Accepted
21 Jul 2000
First published
22 Aug 2000

Phys. Chem. Chem. Phys., 2000,2, 4225-4230

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Structure of vanadate in calcium phosphate and vanadate apatite solid solutions

C. B. Boechat, J. Eon, A. M. Rossi, C. A. de Castro Perez and R. A. da Silva San Gil, Phys. Chem. Chem. Phys., 2000, 2, 4225 DOI: 10.1039/B004339G

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