Hernández Aristeo Garrido, Miranda Joan Reyes, De La Torre Sebastián Diaz, Domínguez Giovanni García
Departamento de Materiales, Universidad Autónoma Metropolitana Azcapotzalco, Av. San Pablo No. 420 Col. Nueva el Rosario, Alcaldía Azcapotzalco, C.P. 02128, CD, Mexico.
Instituto Politécnico Nacional, CIITEC IPN, Cerrada de Cecati S/N, Col. Santa Catarina, Azcapotzalco, Ciudad de México, 02250, Mexico.
J Fluoresc. 2025 Sep 17. doi: 10.1007/s10895-025-04538-x.
This study investigates the microstructure, phase stability, hardness, and luminescent properties of europium-doped hydroxyapatite (HA: Eu) powders synthesized via the hydrothermal method and sintered by spark plasma sintering (SPS) at 900 °C. The morphology of the powders was controlled using different glycerol concentrations, yielding plate-like (L/D = 2.09), rod-like (L/D = 1.61), and elongated spherical morphologies. X-ray diffraction confirmed the retention of the hexagonal HA phase after sintering, with crystallite sizes ranging from 47.5 nm to 75.5 nm. The densification of sintered samples reached up to 96.45%, with HA3S (plate-like morphology) achieving the highest value. Photoluminescence analysis revealed characteristic emission peaks of Eu³⁺ at 574-631 nm under 394 nm excitation, with a migration fraction from Ca²⁺(I) to Ca²⁺(II) of 67% for the smallest particle size. Mechanical testing showed that the microhardness varied significantly with porosity and morphology, with HA3S reaching a maximum hardness of 5.67 GPa, compared to 2.1 GPa for HA1S. These results highlight the importance of morphological control in tailoring the optical and mechanical properties of Eu³⁺-doped HA for biomedical applications.
本研究调查了通过水热法合成并在900℃下通过放电等离子体烧结（SPS）烧结的掺铕羟基磷灰石（HA:Eu）粉末的微观结构、相稳定性、硬度和发光性能。使用不同甘油浓度控制粉末的形态，得到了板状（长径比L/D = 2.09）、棒状（长径比L/D = 1.61）和细长球形形态。X射线衍射证实烧结后六方HA相得以保留，微晶尺寸范围为47.5nm至75.5nm。烧结样品的致密化程度高达96.45%，其中HA3S（板状形态）达到最高值。光致发光分析表明，在394nm激发下，Eu³⁺在574 - 631nm处有特征发射峰，对于最小粒径，从Ca²⁺(I)到Ca²⁺(II)的迁移分数为67%。力学测试表明，显微硬度随孔隙率和形态有显著变化，HA3S达到最大硬度5.67GPa，而HA1S为2.1GPa。这些结果突出了形态控制在调整用于生物医学应用的Eu³⁺掺杂HA的光学和力学性能方面的重要性。
