1,2,4-Triazole Complexes XII * . Magnetic properties of Fe (1, 2, 4-triazole)2 (NCS)2, a quasi two-dimensional S = ½. antiferromagnet with hidden canting
| Autor: | D. W. Engelfriet, W. L. Groeneveld, G. M. Nap |
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| Rok vydání: | 1980 |
| Předmět: | |
| Zdroj: | Zeitschrift für Naturforschung A. 35:852-864 |
| ISSN: | 1865-7109 0932-0784 |
| DOI: | 10.1515/zna-1980-0811 |
| Popis: | Fe(trz)2(NCS)2 has been investigated by means of magnetic susceptibility and magnetization measurements on single crystals at temperatures 1.8-300 K, heat capacity measurements at 1.5-90 K and neutron powder diffraction at 1.2 K. The compound orders antiferromagnetically at Tc = 8.46(2) K. The susceptibilities along the orthorhombic axes are strongly anisotropic, the a axis being the preferred direction. The susceptibility data along a and the heat capacity results are in reasonable agreement with the predictions for the quadratic layer, S = ½. Ising antiferromagnet, with an intralayer exchange constant J/k = - 7.2(2) K. Below Tc the magnetization curve along the a axis reveals a metamagnetic transition at 1.74 kOe. In accordance with the Ising-like properties, a direct transition from the antiferromagnetic to the paramagnetic state is observed along a at 50 kOe. Hidden canting is found to be present. At 1.2 K the compound appears to be monoclinically distorted with α = 88.3° (with respect to Aba2, the space group at 300 K). The magnetic structure consists probably of four sublattices with the magnetic moments lying in the planes z = 0 and z =½ (with respect to the distorted cell in Aba2) along directions that are at an angle of 8° with the a axis. Ligand bonding parameters are discussed in terms of the angular overlap model. |
| Databáze: | OpenAIRE |
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