Spectroscopic and Magnetic Properties of Fe(II)3Fe(III)4(AsO4)6

RC MERCADER; ENRIQUE JOSE BARAN; M.WEIL

Journal of Physics and Chemistry of Solids

Elsevier

Lugar: Amsterdam, Holanda; Año: 2006 vol. 67 p. 1781 - 1785

0022-3697

   The infrared (IR) and (57)Fe-Mössbauer spectra of Fe(II)3Fe(III)4(AsO4)6 were recorded and analyzed on the basis of its structural characteristics. The IR spectrum presents a high complexity, showing an important number of bands and splittings, as a consequence of the presence of three structurally independent AsO4(3-) groups. The analysis of the four quadrupole signlas shown by the Mössbauer spectrum allowed to attain a detailed insight into the cation distribution over the available crystallographic sites. The alternating current susceptibility measurements indicate a paramagnetric to ferrimagnetic transition in the material at about 59 K.