Characterization and Properties of Novel Gallium-Doped Calcium Phosphate Ceramics

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• 作者：Charlotte Mellier ; Franck Fayon ; Verena Schnitzler ; Philippe Deniard ; Mathieu Allix ; Sophie Quillard ; Dominique Massiot ; Jean-Michel Bouler ; Bruno Bujoli ; Pascal Janvier
• 刊名：Inorganic Chemistry
• 出版年：2011
• 出版时间：September 5, 2011
• 年：2011
• 卷：50
• 期：17
• 页码：8252-8260
• 全文大小：1032K
• 年卷期：v.50,no.17(September 5, 2011)
• ISSN：1520-510X

文摘

Addition of a gallium (Ga) precursor in the typical reaction protocols used for the preparation of 尾-tricalcium phosphate (尾-TCP) led to novel Ga-doped 尾-TCP ceramics with rhombohedral structures (R3c space group). From the refinement of their X-ray diffraction patterns, it was found that the incorporation of Ga in the 尾-TCP network occurs by substitution of one of the five calcium (Ca) sites, while occupation of another Ca site decreases in inverse proportion to the Ga content in the structure. The Ga local environment and the modification of the phosphorus environments due to the Ga/Ca substitution in Ga-doped 尾-TCP compounds are probed using ³¹P and ⁷¹Ga magic-angle spinning NMR. A decrease of the unit cell volume is observed with increasing Ga content, together with improved mechanical properties. Indeed, the compressive strength of these new bioceramics is enhanced in direct proportion of the Ga content, up to a 2.6-fold increase as compared to pure 尾-TCP.