abstract
Zinc substituted beta-tricalcium phosphate [beta-Ca(3)(PO(4))(2)] was formed by substituting a zinc precursor in calcium-deficient apatite through aqueous precipitation technique. Heat treatment at 1000 degrees C led to the formation of well crystalline beta-Ca(3)(PO(4)). Refinement technique was used to determine the influence of incorporated zinc in the beta-Ca(3)(PO(4)) structure. The structural data for all the four different zinc substituted beta-Ca(3)(PO(4)) ranging from 0-9 mol% of zinc investigated in the present study confirmed the rhombohedral structure of beta-Ca(3)(PO(4)) in the hexagonal setting (space group R3c). The incorporation of lower sized Zn(2+) (0.745 A for sixfold coordination with O) at the higher sized Ca(2+) (1.00 A for sixfold coordination with O) site in the beta-Ca(3)(PO(4)) structure led to the contraction of unit cell parameters. The added zinc prefers to occupy the Ca(5) site of beta-Ca(3)(PO(4)) structure.
keywords
CRYSTAL-STRUCTURE ANALYSIS; DEFICIENT APATITE; PROTEIN-SYNTHESIS; CERAMICS; DIFFRACTION; ACTIVATION; STRONTIUM; CELLS; MG
subject category
Materials Science
authors
Kannan, S; Goetz-Neunhoeffer, F; Neubauer, J; Ferreira, JMF
our authors
José Maria da Fonte Ferreira
Retired Professoracknowledgements
Thanks are due to the fellowship grants of S. Kannan (SFRH/BPD/18737/2004). The authors thank Daniele Lutz for performing the ICP analysis.