Crystal Structure and Magnetic Properties of a New Two-Dimensional S = 1 Quantum Spin System Ni5(TeO3)4X2 (X = Cl, Br)
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- 作者：Mats Johnsson ; Karl W. Tö ; rnroos ; Peter Lemmens ; and Patrice Millet
- 刊名：Chemistry of Materials
- 出版年：2003
- 出版时间：January 14, 2003
- 年：2003
- 卷：15
- 期：1
- 页码：68 - 73
- 全文大小：188K
- 年卷期：v.15,no.1(January 14, 2003)
- ISSN：1520-5002
文摘
Two new transition-metal tellurium oxy-chlorides of the general formula NiB>5(TeO3)4X2 (X= Cl, Br) have been isolated during the investigation of the ternary phase diagram NiO-NiCl2-TeO2. They crystallize in the monoclinic system, space group C2/c, and for the caseof Ni5(TeO3)4Cl2 the unit cell is a = 19.5674(2) Å, b = 5.2457(1) Å, and c = 16.3084(1) Å,with 
beta2.gif" BORDER=0 ALIGN="middle"> = 125.289(1)
. The structure is layered and built up of corner-connected [Ni5O17X2]entities, made of five nickel(II) octahedra associated by edge and face sharing. The tellurium(IV) atoms are fixed upon the nickel layers. Their lone pairs E and the halogen atoms arepacked in a double layer perpendicular to the [010] direction. From the magnetic point ofview, this system provides a new 2D S = 1 quantum spin system with antiferromagneticsuperexchange interaction. The magnetic susceptibility shows anomalies pointing to magneticordering phenomena. The observed transition temperatures vary with the interlayerseparation.
beta2.gif" BORDER=0 ALIGN="middle"> = 125.289(1). The structure is layered and built up of corner-connected [Ni5O17X2]entities, made of five nickel(II) octahedra associated by edge and face sharing. The tellurium(IV) atoms are fixed upon the nickel layers. Their lone pairs E and the halogen atoms arepacked in a double layer perpendicular to the [010] direction. From the magnetic point ofview, this system provides a new 2D S = 1 quantum spin system with antiferromagneticsuperexchange interaction. The magnetic susceptibility shows anomalies pointing to magneticordering phenomena. The observed transition temperatures vary with the interlayerseparation.