STRUCTURAL AND ELECTRICAL PROPERTIES
IN Pr0.7-x xBa0.3MnO3 MANGANITES
W. Boujelben1, A. Cheikh-Rouhou1*, M. Ellouze1, J. C. Joubert2
1Laboratoire de Physique des Matériaux, Faculté des Sciences de Sfax,
B. P. 802, 3018 Sfax -Tunisie
2Laboratoire de Matériaux et du Génie Physique ENSPG, B. P. 46,
38402 Saint Martin d’Hères Cedex, France
* Corresponding author. E-mail :Abdel.Cheikhrouhou@fss.rnu.tn
Received 20 November 2000 ; revised version accepted 02 May 2001
Deficiency effects in the A site upon structural and electrical properties in lacunar perovskite manganite oxides Pr0.7-x xBaxMnO3 (0 £ x £ 0.23) were investigated. Powder X-ray diffraction patterns, at room temperature showed that our samples were in single phase and could be indexed in rhombohedral perovskite system with Rc space group. Resistivity measurements as a function of temperature showed that all samples exhibit a semiconducting-metallic transition when the temperature decreases. The transition temperature shifted to higher values with increasing deficiency content.
Keywords : Ferromagnetism; Manganites; Lacunar; Perovskite.