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<p>Hydroxyapatite (Ca<sub>10</sub>(PO<sub>4</sub>)<sub>6</sub>(OH)<sub>2</sub>) is the major mineral component of human bone and teeth. As a result, synthetic hydroxyapatite is widely used as a material for bone tissue repair. In this work the synthesis process and thermal stability of Ag-substituted hydroxyapatite obtained by a mechanochemical method using silver orthophosphate as a source of a substituent ion are investigated. It was found that for this synthesis type, the limit of substitution of calcium cations by silver is <i>x</i> = 1.0. The thermal stability of the material depends on the concentration of silver introduced; the higher the concentration of the substituent, the lower the decomposition temperature. Degradation is associated with the release of the β-form of Ag-substituted Ca<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub> and metallic silver, which can significantly modify the properties of the obtained product. Recommendations for the application of this material are given.</p> Graphical abstract <p></p>

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Effect of silver substitution on thermal properties of hydroxyapatite

  • 期刊论文

  • 发表日期：

    2025年9月30日

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  • Svetlana V. Makarova,
  • Irina A. Borodulina,
  • Natalia V. Bulina,
  • Natalya V. Eremina,
  • Igor Yu. Prosanov

摘要

Hydroxyapatite (Ca10(PO4)6(OH)2) is the major mineral component of human bone and teeth. As a result, synthetic hydroxyapatite is widely used as a material for bone tissue repair. In this work the synthesis process and thermal stability of Ag-substituted hydroxyapatite obtained by a mechanochemical method using silver orthophosphate as a source of a substituent ion are investigated. It was found that for this synthesis type, the limit of substitution of calcium cations by silver is x = 1.0. The thermal stability of the material depends on the concentration of silver introduced; the higher the concentration of the substituent, the lower the decomposition temperature. Degradation is associated with the release of the β-form of Ag-substituted Ca3(PO4)2 and metallic silver, which can significantly modify the properties of the obtained product. Recommendations for the application of this material are given.

Graphical abstract