Magnetic and electrical behaviour of La<subscript>0.67</subscript>Ba<subscript>0.33</subscript>Mn<subscript>1− x </subscript>Fe<subscript> x </subscript>O<subscript>3</subscript> perovskites
In: Materials Letters, Jg. 63 (2009-10-15), Heft 24/25, S. 2167-2170
Online
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Zugriff:
Abstract: (La0.67Ba0.33)Mn1− x Fe x O3 manganites compounds have been prepared by doping up to 20% of Fe at the Mn site. As previously reported in the literature paramagnetic (PM) to ferromagnetic (FM) phase transition has been observed in materials with low Fe doping (≤10%). In our x =0 and x =0.05 compounds the Curie temperature (T C) is close to room temperature. Above 10% Fe amount, specimens exhibit a glass magnetic behaviour with a spin- or cluster-like freezing process that can be related to a loss of ferromagnetic double exchange interaction. Below 10% of Fe3+ doping electrical-resistivity measurement shows metal – semiconductor transition with a maximum peak of resistivity (ρ max ) at a temperature T P close to T C. Above 10% of Fe3+ doping amount the materials exhibit only semiconductor behaviour. Both T C and T P decrease with doping rates with an increasing difference in temperature (T P being lower than T C). Results are consistent with a reduction of the number of available hopping sites for the Mn eg(↑) electron due to substitution of Mn3+ by Fe3+ that suppress the double exchange (DE) interactions. [Copyright &y& Elsevier]
Titel: |
Magnetic and electrical behaviour of La<subscript>0.67</subscript>Ba<subscript>0.33</subscript>Mn<subscript>1− x </subscript>Fe<subscript> x </subscript>O<subscript>3</subscript> perovskites
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Autor/in / Beteiligte Person: | Baazaoui, M. ; Zemni, S. ; Boudard, M. ; Rahmouni, H. ; Gasmi, A. ; Selmi, A. ; Oumezzine, M. |
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Zeitschrift: | Materials Letters, Jg. 63 (2009-10-15), Heft 24/25, S. 2167-2170 |
Veröffentlichung: | 2009 |
Medientyp: | academicJournal |
ISSN: | 0167-577X (print) |
DOI: | 10.1016/j.matlet.2009.07.019 |
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