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2005
Magnetic properties
D 9000
Nuclear and Magnetic Structures and Magnetic Properties of
Co3(OH)2(SO4)2(H2O)2. Comparison to the Mn and Ni Analogues. — The title
32- 012 compound
is prepared by hydrothermal treatment of an aqueous suspension of
CoSO4·7H2O and NaOH (autoclave, 245 °C, 10 h). Co3(OH)2(SO4)2(H2O)2 is characterized by single crystal XRD (space group Pbcm, Z = 4) and neutron powder diffraction at 300 K, IR, TG, and magnetic measurements. The structure consists of corrugated
metal-hydroxide layers with intralayer µ6-SO4 groups, and the layers are connected to
one another by µ4-SO4 groups. The compound shows a transition from a paramagnet to
a canted-antiferromagnet at 42 K and displays an unusual hysteresis in the spontaneous
magnetization with temperature.The magnetic moments lie along the c-axis with complete compensation of the moments within one layer. The temperature dependence of
the magnetic moments of the two cobalt atoms also reflects the hysteresis observed in
magnetization. — (BEN SALAH, M.; VILMINOT*, S.; ANDRE, G.;
BOUREE-VIGNERON, F.; RICHARD-PLOUET, M.; MHIRI, T.; KURMOO, M.;
Chem. Mater. 17 (2005) 10, 2612-2621; Groupe Mater. Inorg., Inst. Phys. Chim.
Mater. Strasbourg, CNRS, Univ. Louis Pasteur, F-67037 Strasbourg, Fr.; Eng.) —
Schramke
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