Essehli, R. and Bali, B.E. and Benmokhtar, S. and Bouziane, K. and Manoun, B. and Abdalslam, M.A. and Ehrenberg, H. (2011) Crystal structures and magnetic properties of iron (III)-based phosphates: Na4NiFe(PO4)3 and Na2Ni 2Fe(PO4)3. Journal of Alloys and Compounds, 509 (4). pp. 1163-1171.

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Crystal structures from two new phosphates Na4NiFe(PO 4)3 (I) and Na2Ni2Fe(PO 4)3 (II) have been determined by single crystal X-ray diffraction analysis. Compound (I) crystallizes in a rhombohedral system (S. G: R-3c, Z = 6, a = 8.7350(9) , c = 21.643(4) , R1 = 0.041, wR2=0.120). Compound (II) crystallizes in a monoclinic system (S. G: C2/c, Z = 4, a = 11.729(7) , b = 12.433(5) , c = 6.431(2) , β = 113.66(4)°, R 1 = 0.043, wR2=0.111). The three-dimensional structure of (I) is closely related to the Nasicon structural type, consisting of corner sharing (Ni/Fe)O6 octahedra and PO4 tetrahedra forming NiFe(PO4)34+ units which align in chains along the c-axis. The Na+ cations fill up trigonal antiprismatic sites within these chains. The crystal structure of (II) belongs to the alluaudite type. Its open framework results from Ni2O10 units of edge-sharing NiO6 octahedra, which alternate with FeO6 octahedra that form infinite chains. Coordination of these chains yields two distinct tunnels in which site Na+. The magnetization data of compound (I) reveal antiferromagnetic (AFM) interactions by the onset of deviations from a Curie-Weiss behaviour at low temperature as confirmed by Mössbauer measurements performed at 4.2 K. The corresponding temperature dependence of the reciprocal susceptibility χ-1 follows a typical Curie-Weiss behaviour for T > 105 K. A canted AFM state is proposed for compound (II) below 46 K with a field-induced magnetic transition at H ≈ 19 kOe, revealed in the hysteresis loop measured at 5 K. This transition is most probably associated with a spin-flop transition. © 2010 Elsevier B.V. All rights reserved.

Item Type: Article
Uncontrolled Keywords: Chains; Chromium compounds; Crystal structure; Magnetic materials; Magnetism; Nickel compounds; Phosphates; Single crystals; Sodium compounds; Synthesis (chemical); Temperature distribution; X ray diffraction analysis, Alluaudite; Antiferromagnetic interaction; Curie-Weiss behaviour; Hyperfine interactions; Nasicon; Single crystal X-ray diffraction analysis; Temperature dependence; Three-dimensional structure, Iron compounds
Subjects: Engineering
Divisions: SCIENTIFIC PRODUCTION > Engineering
Depositing User: Administrateur Eprints Administrateur Eprints
Last Modified: 31 Jan 2020 15:47

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