The effects of Cu2+ and La3+ doping on the sintering ability of sol-gel derived high silica bioglasses
| Autor: | Basam A.E. Ben–Arfa, José M.F. Ferreira, Isabel M. Miranda Salvado, Robert C. Pullar |
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| Rok vydání: | 2019 |
| Předmět: |
Density
Bioactive glass Copper Lanthanum Sintering Sol–gel Materials science Settore ING-IND/22 - Scienza e Tecnologia dei Materiali chemistry.chemical_element 02 engineering and technology 01 natural sciences law.invention law 0103 physical sciences Materials Chemistry Crystallization Sol-gel Settore CHIM/03 - Chimica Generale e Inorganica 010302 applied physics Process Chemistry and Technology Settore CHIM/07 - Fondamenti Chimici delle Tecnologie 021001 nanoscience & nanotechnology Microstructure Surfaces Coatings and Films Electronic Optical and Magnetic Materials Devitrification chemistry Chemical engineering Ceramics and Composites 0210 nano-technology |
| Zdroj: | Ceramics International. 45:10269-10278 |
| ISSN: | 0272-8842 |
| Popis: | This paper reports the hierarchical influence of co-doping copper and lanthanum in a sol–gel derived quaternary (Si, Ca, Na, P) bioactive glass on its sintering ability. The mutual effects of Cu & La on density, crystallisation and sinterability were investigated using Taguchi analysis. Thermal properties of bioglasses were assessed by DTA/TGA and dilatometry, while crystallisation phase evolution of was monitored by X–ray diffraction. Ten glass compositions were sintered at two temperatures (800 and 900 °C). The glass structure was analysed by MAS–NMR, the sintered density measured, and sintered microstructures observed by SEM/EDS. Results revealed that Cu promotes early densification, enhancing density at lower sintering temperatures. Oppositely, beneficial sintering effects of La might be observed at higher sintering temperatures (>1000 °C). These differences are induced by the distinct roles of doping elements on devitrification upon increasing their concentrations: crystallisation is promoted by Cu and is inhibited by La. |
| Databáze: | OpenAIRE |
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