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ChemInform Abstract: Synthesis, Crystal Structure and Optical Investigation of the New Phosphates: Na7Mg13Ln(PO4)12 (Ln: La, Eu).

✍ Scribed by Hasna Jerbi; Mourad Hidouri; Benoit Glorieux; Jacques Darriet; Alain Garcia; Veronique Jubera; Mongi Ben Amara

Publisher
John Wiley and Sons
Year
2010
Weight
20 KB
Volume
41
Category
Article
ISSN
0931-7597

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✦ Synopsis

Synthesis, Crystal Structure and Optical Investigation of the New Phosphates: Na7Mg13Ln(PO4)12 (Ln: La, Eu). -Single crystals of the new title compounds are prepared by reaction of Na2CO3, MgCO3, Ln2O3 (Ln: La, Eu), and NH4H2PO4 using Na2MoO4 as a flux (Pt crucible, 1273 K, 2 h). The isotypic compounds crystallize in the orthorhombic space group Cmc21 with Z = 4. Their three-dimensional covalent framework basically consists of [Mg 4 MP 4 O 22 ] ∞ (M: Mg, Na) layers which are interconnected by [Mg4LnP4O32]∞ undulating chains. The resulting framework contains six distinct cavities which are occupied by Na + cations. The compounds Na7Mg13La1-x Eux(PO4)12 (x = 0, 0.02, 0.1, 1) are further characterized by diffuse reflectance and pho-

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