The role of the chemical composition of monetite on the synthesis and properties of α-tricalcium phosphate

Jo Duncan, James F MacDonald, John V Hanna, Yuki Shirosaki, Satoshi Hayakawa, Akiyoshi Osaka, Jan M S Skakle, Iain R Gibson (Corresponding Author)

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)
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Abstract

There has been a resurgence of interest in alpha-tricalcium phosphate (α-TCP), with use in cements, polymer composites and in bi- and tri-phasic calcium phosphate bone grafts. The simplest and most established method for preparing α-TCP is the solid state reaction of monetite (CaHPO4) and calcium carbonate at high temperatures, followed by quenching.

In this study, the effect of the chemical composition of reagents used in the synthesis of α-TCP on the local structure of the final product is reported and findings previously reported pertaining to the phase composition and stability are also corroborated. Chemical impurities in the monetite reagents were identified and could be correlated to the calcium phosphate products formed; magnesium impurities favoured the formation of β-TCP, whereas single phase α-TCP was favoured when magnesium levels were low. Monetite synthesised in-house exhibited a high level of chemical purity; when this source was used to produce an α-TCP sample, the α-polymorph could be obtained by both quenching and by cooling to room temperature in the furnace at rates between 1-10 °C/min, thereby simplifying the synthesis process. It was only when impurities were minimised that the 12 phosphorus environments in the α-TCP structure could be resolved by 31P nuclear magnetic resonance; samples containing chemical impurity showed differing degrees of line-broadening. Reagent purity should therefore be considered a priority when synthesising / characterising the α-polymorph of TCP.

Original languageEnglish
Pages (from-to)123-129
Number of pages7
JournalMaterials Science and Engineering C
Volume34
Early online date6 Sep 2013
DOIs
Publication statusPublished - 1 Jan 2014

Keywords

  • solid state
  • impurities
  • x-ray diffraction
  • tricalcium phosphate
  • 31P NMR
  • magnesium
  • silicon
  • DCPA
  • monetite

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