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Synthesis, Structure and Magnetic Behaviour of Mixed Metal Leucophosphite

Authors: Fa Nian Shi, António Moreira dos Santos, Luís Cunha-Silva, Benilde F. O. Costa, Jacek Klinowski, Filipe A. Almeida Paz, Vítor S. Amaral, João Rocha and Tito Trindade

Ref.: Journal of Solid State Chemistry 181, 1330-1336 (2008)

Abstract: A synthetic analogue of leucophosphite, an iron phosphate, was synthesized hydrothermally at 180 degrees C and its chemical composition determined to be {K[(FeV)(PO4)(2)(OH)(H2O)] center dot H2O}. The compound crystallizes in the monoclinic P2(1)/c space group, with a = 9.7210(19)angstrom, b = 9.6500(19)angstrom, c = 12.198(4)angstrom and beta = 128.569(18)degrees. While the original all-iron compound is reported to be antiferromagnetic, the inclusion of substitutional varradium(III) ions renders the structure ferrimagnetic. Diffraction studies and magnetic characterization show that iron and vanadium are disordered throughout the crystallographic sites. The magnetic behaviour of this system was interpreted in terms of a classic ferrimagnetic mean field model, consisting of two antiferromagnetically coupled non-crystallographic "sub lattices". (c) 2008 Elsevier Inc. All rights reserved.

DOI: 10.1016/j.jssc.2008.02.027