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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Nucleation and growth of needle-like fluorapatite crystals in bioactive glass-ceramics
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Nucleation and growth of needle-like fluorapatite crystals in bioactive glass-ceramics

机译：生物活性玻璃陶瓷中针状氟磷灰石晶体的形核与生长

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摘要

The nucleation behaviors of glass-ceramics with different Ca-mica (Ca0.5Mg3AlSi3O10F2)/fluorapatite ratios were investigated. By using differential thermal analysis (DTA), X-ray diffraction (XRD) and scanning electron microscope with an energy dispersive spectrometer (SEM/EDS), the effect of CaO and P2O5 addition on the nucleation behaviors was studied. Results showed that the addition of CaO and P2O5 promoted nucleation process and led to the formation of different nucleation phases. After further heat treatment, Ca-5(PO4)(3)F crystals were of needle-like morphology, instead of particle-like reported in previous studies. This can be attributed to the one-dimensional rapid growth of fluorapatite along the c-axis. The values of the Avrami parameter, n, and the dimensionality of crystal growth, in, are found to be 2 and 1, respectively, which indicated that the bulk nucleation is the dominant mechanism in crystallization, and one-dimensional growth of fluorapatite is preferred. Since needle-like fluorapatite crystals are of the same morphology to hydroxyapatites in human bones, the glass-ceramics thus prepared show excellent bioactivity in vivo. (C) 2007 Elsevier B.V. All rights reserved.
机译：研究了不同Ca-云母（Ca0.5Mg3AlSi3O10F2）/氟磷灰石比例的玻璃陶瓷的成核行为。通过使用差热分析（​​DTA），X射线衍射（XRD）和带有能谱仪（SEM / EDS）的扫描电子显微镜，研究了CaO和P2O5添加对成核行为的影响。结果表明，CaO和P2O5的加入促进了成核过程，并导致形成不同的成核相。经过进一步热处理后，Ca-5（PO4）（3）F晶体呈针状形态，而不是先前研究中报道的颗粒状。这可以归因于氟磷灰石沿c轴的一维快速生长。 Avrami参数n的值和in的晶体生长维数分别为2和1，这表明本体成核是结晶的主要机制，并且优选一维萤石生长。由于针状氟磷灰石晶体与人骨骼中的羟基磷灰石具有相同的形态，因此制备的玻璃陶瓷在体内显示出优异的生物活性。 （C）2007 Elsevier B.V.保留所有权利。

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