Calcium Metaphosphate Fibers for Biomedical Use

Ota, Yoshio; Iwashita, Tetsushi; Kasuga, Toshihiro; Spiecker, Erdmann; Seki, Azusa

doi:10.4028/www.scientific.net/kem.192-195.421

Cited by 2 publications

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“…In particular, calcium phosphates have been under study as biocompatible glasses, glass ceramics and fibres due to their chemical similarity to the hydroxyapatite found in bone [7][8][9][10]. It has been found that the properties of these glasses are more highly dependant on the local atomic environment of calcium than on the phosphate network [1].…”

Section: Introductionmentioning

confidence: 99%

The structure of calcium metaphosphate glass obtained from x-ray and neutron diffraction and reverse Monte Carlo modelling

Wetherall

Pickup

Newport

et al. 2008

J. Phys.: Condens. Matter

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The short range structure of (CaO)(0.5)(P(2)O(5))(0.5) glass has been studied using x-ray and neutron diffraction and modelled using the reverse Monte Carlo method. Using this combination of techniques has allowed six interatomic correlations to be distinguished and fitted to obtain a set of bond lengths and coordination numbers that describe the structure of the glass. The glass consists of metaphosphate chains of phosphate tetrahedra and each phosphate unit has two non-bridging oxygen atoms available for coordination with Ca. The Ca-O correlation was fitted with two peaks at 2.35 and 2.86 Å, representing a broad distribution of bond lengths. The total Ca-O coordination is 6.9 and is consistent with distorted polyhedral units such as capped octahedra or capped trigonal prisms. It is found that most non-bridging oxygen atoms are bonded to two calcium atoms. All of these observations are consistent with Hoppe's model for phosphate glasses. Furthermore, the medium range order is revealed to consist of phosphate chains intertwined with apparently elongated clusters of Ca ions, and the Ca-O and Ca-P correlations contributed significantly to the first sharp diffraction peak in x-ray diffraction.

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Section: Introductionmentioning

confidence: 99%