Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1492158 | Materials Research Bulletin | 2007 | 13 Pages |
Abstract
Synthesis of apatites, Pb7.4Bi0.3Na2.3(PO4)6 (I), Pb7.36Bi0.32Na2.08Li0.24(PO4)6 (II) and Pb5.78Bi0.81Ca0.60Na2.81(PO4)6 (III), with anion vacancy were carried out during solid state reactions. The three compounds of apatite-type structure crystallize in the hexagonal system, space group P63/m. In every compound, a preferential occupation of the (6h) site by Pb and Bi cations is shown revealing the influence of their lone electronic pair. The introduction of calcium increases the quantity of bismuth in these apatites. Alkaline metals occupy mainly the (4f) site. Infrared spectroscopy is correlated to the bonding scheme. A connection between the cations occupying (4f) sites and the c cell parameters is presented.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Besma Hamdi, Hafed El Feki, Jean-Michel Savariault, Abdelhamid Ben Salah,