title: Influence of magnesium doping on the phase transformation temperature of beta-TCP ceramics examined by Rietveld refinement.
abstract: The influence of Mg doping in Ca(3)(PO(4))(2) on the transformation temperature of beta-tricalcium phosphate (beta-TCP) to alpha-tricalcium phosphate (alpha-TCP) was examined. A maximum substitution by 14 mol% of Mg(2+) on Ca(2+) sites in the beta-TCP structure was determined for powders calcinated at 1025+/-10 degrees C. X-ray powder diffraction analysis (XRPD) in combination with Rietveld method (TOPAS 2.1) was employed for quantitative phase analysis and structural refinement. The synthesized and characterized Mg-doped samples were sintered in air atmosphere in a vertical tube furnace at suitable temperatures ranging from 1460 to 1680 degrees C and subsequently quenched to room temperature, in order to stabilize alpha-TCP. The beta to alpha transformation temperatures were determined by differential temperature analysis and XRPD analysis.
authors.affiliation: Department of Mineralogy, University of Erlangen-Nuernberg, Schlossgarten 5a, 91054 Erlangen, Germany. enderle@geol.uni-erlangen.de
authors.forename: R
authors.initials: R
authors.lastname: Enderle
authors.forename: F
authors.initials: F
authors.lastname: Götz-Neunhoeffer
authors.forename: M
authors.initials: M
authors.lastname: Göbbels
authors.forename: F A
authors.initials: FA
authors.lastname: Müller
authors.forename: P
authors.initials: P
authors.lastname: Greil
mesh_terms: D001672:Biocompatible Materials / Q000032:analysis / Q000737:chemistry*; D002130:Calcium Phosphates / Q000032:analysis / Q000737:chemistry*; D008274:Magnesium / Q000032:analysis / Q000737:chemistry*; D008422:Materials Testing; D044367:Phase Transition; D013696:Temperature; D044366:Transition Temperature; D014961:X-Ray Diffraction
chemical_list: D001672:Biocompatible Materials; D002130:Calcium Phosphates; C485817:beta-tricalcium phosphate; D008274:Magnesium