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Structural and magnetic phases of Fe(ND3)(2)PO4

Author:
Fernández Alfonso, María Belén AuroraUniovi authority; Trobajo Fernández, María del CaminoUniovi authority; Salvado Sánchez, Miguel ÁngelUniovi authority; Pertierra Castro, María del PilarUniovi authority; García-Granda, SantiagoUniovi authority; Rodríguez Fernández, Jesús; Fernández Díaz, María Teresa; Blanco Rodríguez, Jesús ÁngelUniovi authority; García Menéndez, José RubénUniovi authority
Publication date:
2008
Publisher version:
http://dx.doi.org/10.1088/0953-8984/20/10/104227
Citación:
Journal of Physics-Condensed Matter, 20(10), (2008); doi:10.1088/0953-8984/20/10/104227
Abstract:

Polycrystalline samples of Fe(ND3)2PO4 were prepared by means of a hydrothermal route and characterized using powder x-ray diffraction, scanning electron microscopy, chemical and thermal analysis, magnetic measurements, specific heat and neutron diffraction experiments. This material orders within an orthorhombic (Pnma space group) crystal structure at room temperature, but below 220 K the crystal structure changes towards a monoclinic P 21/n structure through a phase transition with almost no latent heat. Furthermore, the magnetic cell at 2 K is twice the size of the crystallographic cell observed at 80 K. The magnetic structure associated with the Fe(III) ions is thus commensurate with the crystal lattice having a propagation vector \vec k=(1/2, 0, 0) , the magnetic moments lying in the yz plane of the crystallographic cell.

Polycrystalline samples of Fe(ND3)2PO4 were prepared by means of a hydrothermal route and characterized using powder x-ray diffraction, scanning electron microscopy, chemical and thermal analysis, magnetic measurements, specific heat and neutron diffraction experiments. This material orders within an orthorhombic (Pnma space group) crystal structure at room temperature, but below 220 K the crystal structure changes towards a monoclinic P 21/n structure through a phase transition with almost no latent heat. Furthermore, the magnetic cell at 2 K is twice the size of the crystallographic cell observed at 80 K. The magnetic structure associated with the Fe(III) ions is thus commensurate with the crystal lattice having a propagation vector \vec k=(1/2, 0, 0) , the magnetic moments lying in the yz plane of the crystallographic cell.

URI:
http://hdl.handle.net/10651/5991
ISSN:
0953-8984
Identificador local:

630

DOI:
10.1088/0953-8984/20/10/104227
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