Magnetic properties of KNaMSi4O10 compounds (M = Mn, Fe, Cu)
authors Brandao, P; Rocha, J; Reis, MS; dos Santos, AM; Jin, R
nationality International
journal JOURNAL OF SOLID STATE CHEMISTRY
author keywords Manaksite; Fenaksite; Litidionite; Magnetic properties; Dimers; Hydrothermal synthesis
keywords CRYSTAL-STRUCTURE; COMPLEXES; TRANSITION; DIMER
abstract In the present work the synthesis and magnetic properties of three compounds with formula KNaMSi4O10 (M = Mn, Fe, Cu) are described. These compounds are synthetic analogs to natural occurring minerals: fenaksite-Fe2+, litidionite-Cu2+ and manaksite-Mn2+. The crystal structure consists of complex silicate chains interconnected by edge-sharing MO5 square pyramids dimerized in M2O8 units. This charged metal-silicate framework is compensated by monovalent alkali metals (K+, Na+). Despite the isostructural nature of these compounds, and the consequent similarity of the M-O topology, that rules the magnetic properties, these are quite different. While there are antiferromagnetic (AF) interactions within the Mn and Cu dimers (exchange interaction J = -3.83(1) and -2.86(3) K, respectively) with no long range order, a ferromagnetic interaction within Fe dimers (J = +7.6(1) K) is observed with a three-dimensional transition at 9K to an AF ground state. The magnetic behaviour is analyzed using the HDVV (Heisenberg-Dirac-Van Vleck) formalism and discussed in the light of the crystal structure. (C) 2008 Elsevier Inc. All rights reserved.
publisher ACADEMIC PRESS INC ELSEVIER SCIENCE
issn 0022-4596
year published 2009
volume 182
issue 2
beginning page 253
ending page 258
digital object identifier (doi) 10.1016/j.jssc.2008.10.024
web of science category Chemistry, Inorganic & Nuclear; Chemistry, Physical
subject category Chemistry
unique article identifier WOS:000263124700008
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journal impact factor 2.726
5 year journal impact factor 2.31
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