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Crystal Structure of Sodium Rare Earth Oxyborates Na2Ln2(BO3)2O (Ln=Sm, Eu, and Gd) and Optical Analysis of Na2Gd2(BO3)2O:Eu3+

✍ Scribed by G. Corbel; M. Leblanc; E. Antic-Fidancev; M. Lemaı̂tre-Blaise

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
542 KB
Volume
144
Category
Article
ISSN
0022-4596

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✦ Synopsis

A new structural family of rare earth oxyborates Na 2 Ln 2 (BO 3 ) 2 O (Ln ‫؍‬ Sm, Eu and Gd) is evidenced. The structure, determined by single crystal X-ray diffraction, is monoclinic, space group P2 1 /c, Z ‫؍‬ 4, with a ‫؍‬ 10.695(6) A s , b ‫؍‬ 6.320(4) A s , c ‫؍‬ 10.328(6) A s , ‫؍‬ 117.80(4)°, V ‫؍‬ 617.5(9) A s 3 , R ‫؍‬ 0.039, wR 2 ‫؍‬ 0.101 for Na 2 Gd 2 (BO 3 ) 2 O. The three-dimensional network is built up from infinite sheets of LnO 8 polyhedra in the (b, c) plane, which are separated by sodium ions. The luminescence of trivalent europium in polycrystalline Na 2 Gd 2 (BO 3 ) 2 O: Eu 3؉ is analysed at 77K. The low symmetry of the rare earth sites, deduced from the X-ray diffraction study, is confirmed. The crystal field strength is high for both europium sites.

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