Crystal data for some sodium rare earth silicates |
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| Authors: | R. D. Shannon T. E. Gier C. M. Foris J. A. Nelen D. E. Appelman |
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| Affiliation: | 1. Central Research and Development Department, E. I. du Pont de Nemours and Company. Experimental Station, 19898, Wilmington, Delaware, USA
2. Department of Mineral Sciences, Smithsonian Institution, NHB 119, 20560, Washington, D. C., USA
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| Abstract: | Single crystal synthesis, X-ray powder diffraction data, and electron microprobe data are given for some Na rare earth silicates of the types NaMSiO4, Na3MSi2O7, Na3MSi3O9, and Na5MSi4O12. NaYSiO4 is orthorhombic with SG Pbn21, a=5.132, b=11.156, anc c=6.405 Å. NaGdSiO4 is tetragonal with SG I4 or I (bar 4) with a=11.743 and c=5.444 Å. A second form of NaGdSiO4 is orthorhombic with SG P21 nb or Pmmb, a=9.179, b=27.29, and c=5.472 Å. Na3YSi2O7 is hexagonal with a=9.416 and c=13.776 Å. Na3YSi3O9 is orthorhombic with a=15.215, b=15.126, and c=15.036 Å. Na ion conductivities of Na3YSi2O7 and Na3YSi3O9 at 300° C of 5×10?6 (Θ-cm)?1 and 6×10?6 (Θ-cm)?1, respectively, are substantially less than that for Na6YSi4O12, 1×10?1 (Θ-cm)?1. |
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