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<p>Calcium phosphate, zinc phosphate, and mixed calcium zinc phosphate glass ceramics in the systems 50CaO-50P₂O₅, 50ZnO-50P₂O₅, and xZnO.(100-x)(CaO-P₂O₅), x = 0–50&#xa0;mol% have been prepared via wet-hydrothermal technique, yielding polycrystalline materials as confirmed by XRD and SEM-EDX analyses. The sharp XRD patterns correspond to crystalline Ca₃(PO₄)₂, Zn₃(PO₄)₂, and Zn₂Ca(PO₃)₂ phases in their respective systems. FTIR spectroscopy enabled calculation of relative areas proportional to different phosphate species (Qⁿ) concentrations, with peaks and relative areas corresponding to (Q⁰+Q¹) and Q² assigned using Gaussian function referencing. Physical properties including hardness, surface morphology, and density were analyzed in relation to structural changes. The substitution of CaO and P₂O₅ with ZnO increases bridging oxygen (BO) concentration up to 20&#xa0;mol% ZnO, enhancing glass ceramic hardness, demonstrating ZnO’s network former role in this concentration range. Further ZnO addition (&gt; 20&#xa0;mol%) decreases BO content and hardness, indicating a transition to a modifier role. The reduction in P₂O₅ and CaO contents increases non-bridging oxygen (NBO) bonds in the phosphate network, leading to increased free volumes (Vf) and oxygen molar volume in the studied glass ceramics.</p>

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Structure and properties of zinc calcium phosphate glass ceramics: mixed former effect

  • 期刊论文

  • 发表日期：

    2025年12月2日

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  • N. Elbassiony,
  • Y. M. Moustafa,
  • A. Elgarayhi,
  • A. M. Abdelghany,
  • G. El-Damrawi

摘要

Calcium phosphate, zinc phosphate, and mixed calcium zinc phosphate glass ceramics in the systems 50CaO-50P₂O₅, 50ZnO-50P₂O₅, and xZnO.(100-x)(CaO-P₂O₅), x = 0–50 mol% have been prepared via wet-hydrothermal technique, yielding polycrystalline materials as confirmed by XRD and SEM-EDX analyses. The sharp XRD patterns correspond to crystalline Ca₃(PO₄)₂, Zn₃(PO₄)₂, and Zn₂Ca(PO₃)₂ phases in their respective systems. FTIR spectroscopy enabled calculation of relative areas proportional to different phosphate species (Qⁿ) concentrations, with peaks and relative areas corresponding to (Q⁰+Q¹) and Q² assigned using Gaussian function referencing. Physical properties including hardness, surface morphology, and density were analyzed in relation to structural changes. The substitution of CaO and P₂O₅ with ZnO increases bridging oxygen (BO) concentration up to 20 mol% ZnO, enhancing glass ceramic hardness, demonstrating ZnO’s network former role in this concentration range. Further ZnO addition (> 20 mol%) decreases BO content and hardness, indicating a transition to a modifier role. The reduction in P₂O₅ and CaO contents increases non-bridging oxygen (NBO) bonds in the phosphate network, leading to increased free volumes (Vf) and oxygen molar volume in the studied glass ceramics.