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<p>This study primarily focused on the synthesis of diopside (CaMgSi₂O₆) through the solid-state sintering method. The process began with locally sourced dolomite (CaMg(CO₃)₂) and low-cost laboratory-grade silica (SiO₂). The preparation conditions involved sintering at a temperature of 1250&#xa0;°C for two hours using two approaches: one without additives and the other with the addition of 0.5% by weight sodium carbonate (Na₂CO₃). The sintered samples were characterized using X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR). The findings indicated that the addition of sodium carbonate enhanced both crystallinity and sintering behavior, and improved the mechanical properties. Furthermore, the incorporation of sodium into the diopside structure was confirmed without the formation of secondary phases. After synthesis, the samples were ground to a particle size of ≤ 200&#xa0;μm and subjected to bioactivity tests. These tests involved immersing the diopside granules in simulated body fluid (SBF) for varying durations of 4&#xa0;h, 1, 4, 7, and 11 days to study the formation and growth of apatite on their surfaces. The effects of sodium carbonate on the biological properties of diopside were analyzed using FTIR, XRD, and Scanning electron microscopy (SEM). The results demonstrated a significant improvement in the bioactivity of diopside with the addition of sodium carbonate compared to pure diopside without additives. This enhancement is attributed to the role of sodium cations as network modifiers. The study concluded that sodium carbonate acts as a bioactivity enhancer, significantly improving the biological properties of diopside.</p>

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Effect of Na2CO3 addition on the densification behavior and mechanical properties of diopside and its bioactivity

  • 期刊论文

  • 发表日期：

    2026年6月16日

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  • Souheila Zouai,
  • Roufaida Louali,
  • Asma Fares,
  • Anfel Benmehania,
  • Fatiha Guerfa,
  • Abdelhamid Harabi

摘要

This study primarily focused on the synthesis of diopside (CaMgSi₂O₆) through the solid-state sintering method. The process began with locally sourced dolomite (CaMg(CO₃)₂) and low-cost laboratory-grade silica (SiO₂). The preparation conditions involved sintering at a temperature of 1250 °C for two hours using two approaches: one without additives and the other with the addition of 0.5% by weight sodium carbonate (Na₂CO₃). The sintered samples were characterized using X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR). The findings indicated that the addition of sodium carbonate enhanced both crystallinity and sintering behavior, and improved the mechanical properties. Furthermore, the incorporation of sodium into the diopside structure was confirmed without the formation of secondary phases. After synthesis, the samples were ground to a particle size of ≤ 200 μm and subjected to bioactivity tests. These tests involved immersing the diopside granules in simulated body fluid (SBF) for varying durations of 4 h, 1, 4, 7, and 11 days to study the formation and growth of apatite on their surfaces. The effects of sodium carbonate on the biological properties of diopside were analyzed using FTIR, XRD, and Scanning electron microscopy (SEM). The results demonstrated a significant improvement in the bioactivity of diopside with the addition of sodium carbonate compared to pure diopside without additives. This enhancement is attributed to the role of sodium cations as network modifiers. The study concluded that sodium carbonate acts as a bioactivity enhancer, significantly improving the biological properties of diopside.