University of Khartoum

Mössbauer Investigation of the Compounds YBa2 Fe3 O7+x Fe-Based 1-2-3 Ceramic Oxides

Mössbauer Investigation of the Compounds YBa2 Fe3 O7+x Fe-Based 1-2-3 Ceramic Oxides

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Title: Mössbauer Investigation of the Compounds YBa2 Fe3 O7+x Fe-Based 1-2-3 Ceramic Oxides
Author: Muhammad Ali, Rizgalla
Abstract: The YBa2Fe3O7+x (x = 0.69) compound, synthesized through The normal ceramic routes, is found to have an orthorhombic structure [Pmmm, a=3.9078(11) Å, b=3.9406(4) Å, c=11.7292(37) Å] with Fe3+ occupying two nonequivalent sites (1a and 2q). Mössbauer studies (MES) reveal an Anti- Ferromagnetic (AFM) order with a Beff that follows a s = 5/2 Brillouin function, giving Beff (T=0) = (48.5 .5) T and TN = (l020 0)K. Due to their highly symmetric character, the (6S) Fe3+ ions are insensitive to their surrounding electronic environment, consequently a single set (rather than two sets) of hyperfine parameters, is reflected in MES spectra. Based on the above results, as well as on data published, some comments are given regarding the interpretation of the MES results of the intensively studied YBa2(Cu1-yFey)3O7-z system
URI: http://khartoumspace.uofk.edu/handle/123456789/14293
Date: 2015-06-23


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