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Please use this identifier to cite or link to this item: http://hdl.handle.net/10651/8608

Title: Decoupled structural and non-collinear magnetic phase transitions in Fe(ND3)(2)PO4
Author(s): Fernández Alfonso, María Belén Aurora
Trobajo Fernández, María del Camino
Piqué Rami, María del Carmen
Fernández Díaz, María Teresa
Rodríguez Fernández, Jesús
Salvado Sánchez, Miguel Ángel
Pertierra Castro, María del Pilar
García-Granda, Santiago
Blanco Rodríguez, Jesús Ángel
García Menéndez, José Rubén
Keywords: Iron Phosphates; Structural Phase Transition; Heat Capacity Measurements; Magnetic Properties
Issue date: 2010
Publisher version: http://dx.doi.org/10.1016/j.actamat.2009.11.016
Citation: Acta Materialia, 58(5), p. 1741-1749 (2010); doi:10.1016/j.actamat.2009.11.016
Format extent: p. 1741-1749
Abstract: Interest in Fe(ND3)2PO4, one of the first three-dimensional structurally linked solids forming Fe–ND3 bonds, has been renewed recently due to the observation of structural and magnetic phase transitions. This paper reports powder neutron diffraction experiments which show that Fe(ND3)2PO4 crystallizes at room temperature in an orthorhombic (Pnma) crystal structure, but that below Tt = 226(5) K the crystal progressively adopts a monoclinic (P21/n) structure via a continuous phase transition, as observed from heat capacity measurements in the temperature range 250–100 K. In addition, neutron diffraction experiments suggest that the magnetic structure is non-collinear with an incommensurate propagation vector View the MathML source, with τ ∼ 0.04 reciprocal lattice units (rlus), and that the magnitude of the Fe(III) magnetic moments is close to μFe = 4.5 μB at T = 2 K, describing a helimagnetic arrangement. To the best of our knowledge, this is an unprecedented magnetic ordering in an iron phosphate lattice. We argue that the proposed magnetic ordering can be explained by means of a model of superexchange interactions involving Fe–O–P–O–Fe paths.
URI: http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6TW8-4Y1W3VK-1-28&_cdi=5556&_user=971488&_pii=S1359645409007952&_origin=search&_coverDate=03%2F31%2F2010&_sk=999419994&view=c&wchp=dGLzVtb-zSkWb&md5=5184b3763526e8850e2a8726264aa812&ie=/sdarticle.pdf
ISSN: 1359-6454
Local identifier: 20100269
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