Pub Date : 2022-02-04DOI: 10.5772/intechopen.102410
K. Kthiri, M. Mehnaoui, S. Jebahi, K. Boughzala, M. Hidouri
Britholites derivatives of apatite’s that contain lanthanium and neodymium in the serial compounds Sr8La2−xNdx(PO4)4(SiO4)2F2 with 0 ≤ x ≤ 2 were subject of the present investigation. The solid state reaction was the route of preparing these materials. Several techniques were employed for the analysis and characterization of the synthesized powders. The chemical analysis results indicated that molar ratio Sr+La+NdP+Si was of about 1.67 value of a stoichiometric powder. The X-ray diffraction data showed single-phase apatites crystallizing in hexagonal structure with P63/m space group were successively obtained. Moreover, the substitution of lanthanium by neodymium in strontium phosphosilicated fluorapatite was total. This was confirmed by the a and c lattice parameters contraction when (x) varies coherently to the sizes of the two cations. The infrared spectroscopy and the 31P NMR (MAS) exhibited the characteristic bands of phosphosilicated fluorapatite. The pressureless sintering of the material achieved a maximum of 89% relative density. The sintered specimens indicated that the Nd content as well as the heating temperature affected the ionic conduction of the materials and the maximum was 1.73 × 10−6 S cm−1 obtained at 1052 K for x = 2.
本文研究了含镧和钕的磷灰石系列化合物Sr8La2−xNdx(PO4)4(SiO4)2F2中0≤x≤2的钡绿岩衍生物。固相反应是制备这些材料的主要途径。采用多种技术对合成的粉末进行了分析和表征。化学分析结果表明，Sr+La+NdP+Si的摩尔比约为1.67。x射线衍射数据显示，得到了具有P63/m空间群的六方晶型单相磷灰石。此外，磷硅化锶氟磷灰石中镧被钕完全取代。当(x)随两个阳离子的大小相干变化时，a和c晶格参数的收缩证实了这一点。红外光谱和31P核磁共振(MAS)显示出磷硅化氟磷灰石的特征波段。材料的无压烧结最大达到89%的相对密度。烧结试样表明，Nd含量和加热温度对材料的离子导电性都有影响，在1052 K时，x = 2的离子导电性最大值为1.73 × 10−6 S cm−1。
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