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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Hampshire, Stuart
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (24/24 displayed)
- 2023Mechanical properties of oxynitride glassescitations
- 2018Mechanical properties, structure, bioactivity and cytotoxicity of bioactive Na-Ca-Si-P-O-(N) glassescitations
- 2017Types of ceramics: Material classcitations
- 2017Types of ceramics : material class
- 2015Effect of Nitrogen on Properties of Na 2 O-CaO-SrO-ZnO-SiO 2 Glassescitations
- 2015Waste-to-resource preparation of a porous ceramic membrane support featuring elongated mullite whiskers with enhanced porosity and permeancecitations
- 2015Silicon Nitride Ceramicscitations
- 2012Glass reactive sintering as an alternative route for the synthesis of NZP glass-ceramicscitations
- 2011Silicon Nitride Grain Boundary Glasses: Chemistry, Structure and Propertiescitations
- 2011Comparison of Microwave and Conventionally Sintered Yttria-Doped Zirconia Ceramicscitations
- 2008Controlled Crystallisation of a Y-Si-Al-O-N Glass Typical of Grain Boundary Glasses Formed in Silicon Nitride-Based Ceramicscitations
- 2008Developments in SiAlON Glasses and their Derivatives: Effects of Chemistry on Properties
- 2008SiAlON B-Phase Glass-Ceramic Microstructures
- 2008Silicon Nitride Ceramicscitations
- 2007Ca-SiAlON Glasses: Effects of Fluorine on Glass Formation and Propertiescitations
- 2007An Introduction to the Glass Formation and Properties of Ca-Si-Al-O-N-F Glassescitations
- 2007Effect of Cooling Rate on Glass Formation for Some Oxynitride Glassescitations
- 2007The Intergranular Oxynitride Microstructure in Silicon Nitride Based Ceramicscitations
- 2007Oxynitride Glasses: Preparation, Properties and Implications for Mechanical Behaviour of Silicon Nitridecitations
- 2006Oxynitride Glasses and Their Properties - Implications for High Temperature Performance of Silicon Nitride-Based Ceramicscitations
- 2006The Crystallisation of B-Phase Glass-Ceramicscitations
- 2005Properties and Crystallization of Rare-Earth Si-Al-O-N Glasses Containing Mixed Trivalent Modifiers
- 2005Viscosities of Oxynitride Glass and the Effects on High Temperature Behaviour of Silicon Nitride-Based Ceramicscitations
- 2005Comparison of Silicon Nitrides with Carbon Additions Prepared by Two Different Sintering Methodscitations
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article
Mechanical properties, structure, bioactivity and cytotoxicity of bioactive Na-Ca-Si-P-O-(N) glasses
Abstract
International audience ; Bioactive glasses are able to bond to bone through formation of carbonated hydroxyapatite in body fluids. However, because of their poor strength their use is restricted to non-load-bearing applications. The effects of nitrogen addition on the physical and mechanical properties and structure of bioactive oxynitride glasses in the system Na–Ca–Si–P–O–N have been studied. Glasses with compositions (mol.%): 29Na 2 O–13.5CaO–2.5P 2 O 5 –(55 −3x)SiO 2 –xSi 3 N 4 (x is the no. of moles of Si 3 N 4 ) were synthesised with up to 1.5 at% P and 4.1 at% N. A novel 3-step process was used for addition of P and N and this proved successful in minimising weight losses and producing homogeneous glasses with such high SiO 2 contents. The substitution of 4.12 at% N for oxygen results in linear increases in density (1.6%), glass transition temperature (6%), hardness (18%) and Young's modulus (74%). Vickers Indentation Fracture (VIF) resistance (K ifr ) was calculated from various relationships depending on the load, indent diagonal, crack lengths and Young's modulus to hardness (E/H) ratio. Firstly, Meyer's index n is calculated from the slope of the logarithmic plot of load versus indent diagonal. Then by comparing the experimental slopes of the logarithmic plots of crack lengths versus load it is concluded that the cracking mode is Radial Median type. The substitution of 4.12 at% N for oxygen results in an increase in K ifr of 40%. These increases in properties are consistent with the incorporation of N into the glass structure in three-fold coordination with silicon which results in extra cross-linking of the glass network. The structure of these bioactive oxynitride glasses was investigated by solid state nuclear magnetic resonance (MAS NMR) of 31 P and 29 Si. The structure reveals that all the N atoms are bonded to Si atoms with the formation of SiO 3 N, SiO 2 N 2 and Q 4 structural units with extra bridging anions at the expense of Q 3 units. The bioactivity of the glasses has been evaluated by ...