A New Synthetic Route to Calcium Polyphosphates

Lauren E. Jackson; Adrian J. Wright

doi:10.4028/www.scientific.net/KEM.284-286.71

Paper Titles

The Effect of Different Surface Modification Agents on the Dispersion of Nano-Hydroxyapatite (n-HA) Crystallites
p.55

Synthesis and Characterisation of Hydroxyapatite Nano-Rods/Whiskers
p.59

Protein Loading and Solubility of Apatite Hydrogel
p.63

A Method for Simultaneously Precipitating and Dispersing Nano-Sized Calcium Phosphate Suspensions
p.67

A New Synthetic Route to Calcium Polyphosphates
p.71

Control of Crystal Orientation of Hydroxyapatite by Imposing a High Magnetic Field
p.75

Preparation and Properties of Lanthanide Phosphates
p.79

Si, Zn-Modified Tricalcium Phosphates: A Phase Composition and Crystal Structure Study
p.83

Indentation Testing of a Bone Defect Filled with Two Different Injectable Bone Substitutes
p.89

HomeKey Engineering MaterialsKey Engineering Materials Vols. 284-286A New Synthetic Route to Calcium Polyphosphates

A New Synthetic Route to Calcium Polyphosphates

Abstract:

This study describes the use of flux methods as a novel synthetic route to some known and new calcium polyphosphates, with a view to developing new biomaterials. Calcium acid pyrophosphate, CaH2P2O7, which is a known precursor in the preparation of many other calcium polyphosphates, has been synthesized as a pure crystalline phase in a single step synthesis at temperatures between 190-250 °C. Reaction temperatures between 250 and 400 °C led to the synthesis of γ-Ca(PO3)2, a previously uncharacterised polymorph of calcium metaphosphate. Lattice parameters of a = 10.3682(1) Å, b = 9.5001(1) Å, c = 9.5552(1) Å, with β angle of 93.45(4)° were obtained from powder X-ray diffraction data. A subsequent increase in reaction temperature to 550 °C was found to produce a calcium polyphosphate glass. A detailed study of thermal stability of CaH2P2O7 was also performed to determine phase stability and decomposition pathways.

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Periodical:

Key Engineering Materials (Volumes 284-286)

Pages:

71-74

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.284-286.71

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Online since:

April 2005

Authors:

Lauren E. Jackson, Adrian J. Wright

Keywords:

Beta Calcium Metaphosphate, Calcium Acid Pyrophosphate, Calcium Polyphosphate, Gamma Calcium Metaphosphate

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