Hydrothermal synthesis and magnetic studies of transition metal nocerites M3(BO3)F3 (M=Fe,Co, Ni) |
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| Affiliation: | 1. Instituto de Nanociencia y Materiales de Aragón, Departamento de Física de la Materia Condensada, CSIC-Universidad de Zaragoza, C/ Pedro Cerbuna 12, 50009 Zaragoza, Spain;2. Institut Laue-Langevin, Boîte Postale 156, 38042 Grenoble, France;3. Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193, Bellaterra, Spain |
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| Abstract: | Polycrystalline samples of M3(BO3)F3 (M=Fe, Co, Ni), isostructural with nocerite Mg3(BO3)(OH,F)3, have been prepared in supercritical hydrothermal conditions. These compounds represent with boracites, M3B7O13F (M=Mg, Cr, Mn, Fe, Co, Zn), the only transition metal fluoride borates known to date. Co3(BO3)F3 and Ni3(BO3)F3 are antiferromagnetic with TN=17(2) and 40(2) K, respectively. Spin-flop transitions at BC1=4.0 T and BC2=7.5 T occur at 1.6 K in Co3(BO3)F3, while a parasitic ferromagnetism (0.02 μB/Ni2+ at 1.6 K) appears below TN in Ni3(BO3)F3. The magnetic structures consist of three spin sub-lattices of double rutile-type ferromagnetic chains. |
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