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DOI: 10.1039/A708080H (Paper) Reference Section for: J. Mater. Chem., 1998, 8, 1043-1050

Crystal structures and luminescence properties of La3Zr4F25 and α-LaZr3F15

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Jeannette Dexpert-ghys, Sidney J. L. Ribeiro, Pierre Dugat and Daniel Avignant

Abstract

During a study of the LaF3–ZrF4 system, both La3Zr4F25 and α-LaZr3F15 compounds have been evidenced. Their crystal structures have been determined from single-crystal X-ray diffraction data. La3Zr4F25 crystallises in the cubic system with a=12.384 Å and I[4 with combining macron]3d space group (no. 220). Its crystal structure is built up of (ZrF6)2– octahedra and (LaF8)5– dodecahedra sharing corners. The low temperature form, α , of LaZr3F15 is orthorhombic (space group Pmmn, no. 59) with a=15.721 Å, b=16.299 Å, c=8.438 Å. Its structure is built of corner-sharing tricaped trigonal prisms surrounding the La3+ ions and both octahedra and monocapped trigonal prisms encompassing the Zr4+ ions. This structure is characterised by dynamically disordered (ZrF6)2– complex anions.

The Eu3+ luminescence properties of these phases have been investigated and are discussed in relationship with their crystal structures.

References

  1. S. J. L. Ribeiro, P. Dugat, D. Avignant and J. Dexpert-Ghys, J. Non-Cryst. Solids, 1996, 8, 197.
  2. B. A. Frenz, Computing in crystallography, ed. H. Shenk, R. Olthof-Hazekamp, H. Van Koningveld and G. C. Bassi, Delft University Press, Delft, The Netherlands, 1982 Search PubMed.
  3. A. Zalkin, D. Eimerl and S. P. Velsko, Acta Crystallogr., Sect. C, 1988, 44, 2050 CrossRef.
  4. R. Papiernik and B. Frit, Mater Res. Bull., 1984, 19, 509 CAS.
  5. A. Mikou, J. P. Laval and B. Frit, Rev. Chim. Miner, 1987, 24, 315 CAS.
  6. G. Brunton, Acta Crystallogr., Sect. B, 1971, 27, 245 CrossRef CAS.
  7. R. D. Shannon, Acta Crystallogr., Sect. A, 1976, 32, 751 CrossRef.
  8. J. P. Laval and B. Frit, Acta Crystallogr., Sect. B, 1980, 36, 2533 CrossRef.
  9. J. P. Laval, B. Frit and J. Lucas, J. Solid State Chem., 1988, 72, 181 CAS.
  10. E. G. Steward and H. P. Rookby, Acta Crystallogr., 1953, 6, 49 CrossRef CAS.
  11. H. J. Hurst and J. C. Taylor, Acta Crystallogr., Sect. B, 1970, 26, 417 CrossRef CAS.
  12. H. J. Hurst and J. C. Taylor, Acta Crystallogr., Sect. B, 1970, 26, 2136 CrossRef CAS.
  13. E. Caignol, J. Metin, R. Chevalier, J. C. Cousseins and D. Avignant, Eur. J. Solid State Inorg. Chem., 1988, 25, 399 CAS.
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