Ferromagnetism in talc-like cobalt-phyllosilicates |
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| Affiliation: | 1. State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China;2. Department of Chemistry, Nanchang University, Nanchang 330031, China;3. School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, Brisbane 4001, Australia |
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| Abstract: | The synthetic layered 1:1 phyllosilicate, Co2.3Al0.7Si1.3Al0.7O5(OH)4, and 2:1 phyllosilicates Co3Si4O10(OH)0.7F1.3, Co3Si4O10(OH)1.2F0.8(Co(CH3COO)2)0.24, Co3Si4O10(OH)1.3F0.7 (TAEAH)0.12 and Co3Si4O10(OH)1.3F0.7 (TAEAH)0.24 have been obtained under hydrothermal conditions at ca. 200 °C (TAEA : (tris-aminoethyl)-amine). The compounds are characterized by interplanar distances of 7.0, 9.5, 11.1, 13.3 and 14.3 Å, respectively. They show long range magnetic ordering below 16 K, characterized by positive Weiss constants, imaginary component in the ac-susceptibility, spontaneous magnetisation in small applied field and coercive fields in the range 400 to 700 Oe. The magnetisation in field of 3 Tesla classifies them as 3D ferromagnet. |
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