Crystal structure and spectroscopic studies of NaGd(PO{sub 3}){sub 4}
- Laboratoire des Materiaux, Institut National de Recherche Scientifique et Technique, B.P. 95, Hammam Lif 2050 (Tunisia)
- Faculte des Sciences de Bizerte, 7021 Zarzouna (Tunisia)
Single crystals of gadolinium-sodium polyphosphate NaGd(PO{sub 3}){sub 4} were grown for the first time using a flux method and characterized by X-ray diffraction. This phosphate crystallizes in a monoclinic system with P2{sub 1}/n space group and with the following unit-cell dimensions: a=9.767(3)A, b=13.017(1)A, c=7.160(2)A, {beta}=90.564(5){sup o}, V=910.3(4)A{sup 3} and Z=4. The crystal structure was solved from 3451 X-ray independent reflections with final R(F{sup 2})=0.0219 and R{sub w}(F{sup 2})=0.056 refined with 164 parameters (F{sub 0}{sup 2}>4{sigma}(F{sub 0}{sup 2})). The atomic arrangement can be described as a long chain polyphosphate organization. Two infinite (PO{sub 3}){proportional_to} chains with a period of eight tetrahedra run along the [011] direction. The structure of NaGd(PO{sub 3}){sub 4} consists of GdO{sub 8} polyhedra sharing oxygen atoms with phosphoric group PO{sub 4}. Each Na{sup +} ion is bonded to eight oxygen atoms.
- OSTI ID:
- 20889813
- Journal Information:
- Materials Research Bulletin, Vol. 40, Issue 12; Other Information: DOI: 10.1016/j.materresbull.2005.07.005; PII: S0025-5408(05)00244-8; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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