Arsenate substitution in hydroxylapatite: Structural characterization of the ca5(pxas1-x04)30h solid solution

Young Jae Lee, Peter W. Stephens, Yuanzhi Tang, Wei Li, Brian L. Phillips, John B. Parise, Richard J. Reeder

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

Arsenate (As5+) substitution in the hydroxylapatite structure was examined using a combination of crystallographic and spectroscopic techniques. Samples of hydroxylapatite, the As5+-substituteł analog (synthetic johnbaumite), and five intermediate compositions were synthesized from solution. Synchrotron X-ray diffraction data show that all samples are single-phase, confirming complete substitution. No evidence is found for lowering of symmetry below P63/m. Rietveld structure refinements show progressive expansion of the unit cell with increasing As substitution, which can be accounted for primarily by an average expansion of the tetrahedral site. Sizes of Ca polyhedra show little variation as a result of As substitution. NMR results show no evidence for local clustering of P0 4 tetrahedra. EXAFS confirms that the size of As-centered tetrahedra remains constant across the solid-solution series.

Original languageEnglish
Pages (from-to)666-675
Number of pages10
JournalAmerican Mineralogist
Volume94
Issue number5-6
DOIs
Publication statusPublished - 2009 May 1

Fingerprint

arsenates
arsenate
Durapatite
solid solution
Solid solutions
substitution
Substitution reactions
solid solutions
substitutes
tetrahedrons
Synchrotrons
expansion
nuclear magnetic resonance
symmetry
polyhedrons
X-ray diffraction
Nuclear magnetic resonance
synchrotrons
X ray diffraction
arsenic acid

Keywords

  • Apatite
  • Arsenate
  • Arsenic
  • EXAFS
  • Hydroxylapatite
  • Johnbaumite
  • NMR

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Arsenate substitution in hydroxylapatite : Structural characterization of the ca5(pxas1-x04)30h solid solution. / Lee, Young Jae; Stephens, Peter W.; Tang, Yuanzhi; Li, Wei; Phillips, Brian L.; Parise, John B.; Reeder, Richard J.

In: American Mineralogist, Vol. 94, No. 5-6, 01.05.2009, p. 666-675.

Research output: Contribution to journalArticle

Lee, Young Jae ; Stephens, Peter W. ; Tang, Yuanzhi ; Li, Wei ; Phillips, Brian L. ; Parise, John B. ; Reeder, Richard J. / Arsenate substitution in hydroxylapatite : Structural characterization of the ca5(pxas1-x04)30h solid solution. In: American Mineralogist. 2009 ; Vol. 94, No. 5-6. pp. 666-675.
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