title: Structure and properties of bioactive eutectic glasses based on the Ca3(PO4)2-CaSiO3-CaMg(SiO3)2 system.
abstract: Taking into account the phase equilibrium relationships within the Ca3(PO4)2-CaSiO3-CaMg(SiO3)2 ternary system, three bioactive glasses with a eutectic composition and analogous amounts of Ca3(PO4)2 (∼40 wt.%) have been prepared. The structure of the glasses was investigated by 31P and 29Si magic angle spinning nuclear magnetic resonance (MAS-NMR) spectroscopy. The glasses exhibited thermal expansion coefficients (50-600 °C) of 11.8-13.3×10(-6) °C(-1), a glass transition temperature of 790-720 °C and a softening temperature of 811-750 °C. The mechanical properties of the glasses were as follows: bending strength ∼100 MPa, Young's modulus 94-83 GPa, Vickers microhardness 7.1-4.1 GPa and toughness 0.8 MPa m1/2. The bioactive properties were discussed in terms of their structure deduced by MAS-NMR spectroscopy and the field strength of the network modifiers (Mg2+ and Ca2+). A knowledge of the glass structure was important in predicting its bioactivity.
authors: Instituto de Cerámica y Vidrio, ICV-CSIC, C/Kelsen 5, 28049 Madrid, Spain.
authors: M
authors: M
authors: Magallanes-Perdomo
authors: A H
authors: AH
authors: De Aza
authors: I
authors: I
authors: Sobrados
authors: J
authors: J
authors: Sanz
authors: P
authors: P
authors: Pena
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D017610:Calcium Compounds / Q000737:chemistry*; D002130:Calcium Phosphates / Q000737:chemistry*; D004055:Differential Thermal Analysis; D055119:Elastic Modulus; D005898:Glass / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008422:Materials Testing; D055595:Mechanical Phenomena; D008855:Microscopy, Electron, Scanning; D008956:Models, Chemical; D044367:Phase Transition; D017640:Silicates / Q000737:chemistry*; D012825:Silicon; D013052:Spectrometry, X-Ray Emission; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D001672:Biocompatible Materials; D017610:Calcium Compounds; D002130:Calcium Phosphates; D017640:Silicates; C020243:calcium phosphate; C031293:calcium silicate; D012825:Silicon