Crystal structure and magnetic properties of Co7(TeO3)4Br6—a new cobalt tellurite bromide. Becker, R., Johnsson, M., Berger, H., Prester, M., Zivkovic, I., Drobac, D., Miljak, M., & Herak, M. Solid State Sciences, 8(7):836-842, 7, 2006. Website abstract bibtex The crystal structure of the new compound Co7(TeO3)4Br6 is described together with the magnetic properties. The new compound crystallizes in the monoclinic space group C2/c with the unit cell parameters a=20.6532(5) Å, b=8.6533(2) Å, c=14.7262(5) Å, β=124.897(3)°, Z=4. The crystal structure was solved from single crystal data, R=0.0242. The structure can be considered as layered and the building units are [CoO4Br2] and [CoO2Br4] octahedra and [TeO3E] tetrahedra, E being the 5s2 lone pair on the Te(IV) ions. The magnetic properties of the compound are characterised by antiferromagnetic correlations at high temperatures, strong deviation from the Curie–Weiss behaviour in a broad intermediate temperature range and long range magnetic ordering setting-in at low temperatures. Magnetic ordering takes place in stages, being represented by two susceptibility anomalies, at TN=33 K and TC=27 K. The magnetic transition at TC is ferromagnetic (or ferrimagnetic) in character.
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title = {Crystal structure and magnetic properties of Co7(TeO3)4Br6—a new cobalt tellurite bromide},
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year = {2006},
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abstract = {The crystal structure of the new compound Co7(TeO3)4Br6 is described together with the magnetic properties. The new compound crystallizes in the monoclinic space group C2/c with the unit cell parameters a=20.6532(5) Å, b=8.6533(2) Å, c=14.7262(5) Å, β=124.897(3)°, Z=4. The crystal structure was solved from single crystal data, R=0.0242. The structure can be considered as layered and the building units are [CoO4Br2] and [CoO2Br4] octahedra and [TeO3E] tetrahedra, E being the 5s2 lone pair on the Te(IV) ions. The magnetic properties of the compound are characterised by antiferromagnetic correlations at high temperatures, strong deviation from the Curie–Weiss behaviour in a broad intermediate temperature range and long range magnetic ordering setting-in at low temperatures. Magnetic ordering takes place in stages, being represented by two susceptibility anomalies, at TN=33 K and TC=27 K. The magnetic transition at TC is ferromagnetic (or ferrimagnetic) in character.},
bibtype = {article},
author = {Becker, Richard and Johnsson, Mats and Berger, Helmuth and Prester, Mladen and Zivkovic, Ivica and Drobac, Djuro and Miljak, Marko and Herak, Mirta},
journal = {Solid State Sciences},
number = {7}
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