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

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....

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Bibliographic Details
Published in:Solid state sciences 2014-09, Vol.35, p.28-32
Main Authors: Latshaw, Allison M., Smith, Mark D., zur Loye, Hans-Conrad
Format: Article
Language:English
Subjects:
Apatite
Apatite structure
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Crystal growth
Crystal structure
Crystallization
Exact sciences and technology
Flux
Flux growth
Growth from melts
zone melting and refining
Materials science
Methods of crystal growth
physics of crystal growth
Oxyfluorides
Physics
Rare earth metals
Silicates
Single crystals
Structure of solids and liquids
crystallography
Structure of specific crystalline solids
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Summary: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. [Display omitted] •Three Nd containing silicates have been synthesized and characterized.•Na0.50Nd4.50(SiO4)3O, Na0.63Nd4.37(SiO4)3O0.74F0.26 are apatite structures.•Eutectic flux crystal growth was used to synthesize these new silicate structures.
ISSN:1293-2558
1873-3085
DOI:10.1016/j.solidstatesciences.2014.06.005