Crystal growth and structure of three new neodymium containing silicates: Na0.50Nd4.50(SiO4)3O,Na0.63Nd4.37(SiO4)3O0.74F0.26 and Na4.74Nd4.26(O0.52F0.48)[SiO4]4 |
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| Institution: | 1. Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou City, Fujian Province 350002, PR China;2. College of Materials Science and Engineering, Fujian Normal University, Fuzhou City, Fujian Province 350007, PR China;3. College of Chemistry, Fuzhou University, Fuzhou City, Fujian Province 350116, PR China |
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| Abstract: | Single crystals of Na0.50Nd4.50(SiO4)3O, Na0.63Nd4.37(SiO4)3O0.74F0.26, and Na4.74Nd4.26(O0.52F0.48)SiO4]4 were synthesized via flux growth using a NaF/KF eutectic flux and the crystal structure was determined by single crystal X-ray diffraction. Na0.50Nd4.50(SiO4)3O and Na0.63Nd4.37(SiO4)3O0.74F0.26 adopt the apatite structure and crystallize in the hexagonal space group P63/m, while Na4.74Nd4.26(O0.52F0.48)SiO4]4 crystallizes in the tetragonal space group I-4 and exhibits rare-earth mixing on the sodium site. The unit cells of the crystals are a = 9.5400(3) Å and c = 7.0331(5) Å for Na0.50Nd4.50(SiO4)3O, a = 9.5533(3) Å and c = 7.0510(4) Å for Na0.63Nd4.37(SiO4)3O0.74F0.26, and a = 12.1255(3) Å and c = 5.4656(2) Å for Na4.74Nd4.26(O0.52F0.48)SiO4]4. These three compounds exhibit three-dimensional crystal structures that are discussed in detail in this paper. |
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| Keywords: | Crystal growth Flux growth Apatite structure Oxyfluorides Silicates |
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