STRUCTURAL AND ELECTRICAL PROPERTIES

IN Pr0.7-x xBa0.3MnO3 MANGANITES

W. Boujelben1, A. Cheikh-Rouhou1*, M. Ellouze1, J. C. Joubert2

1 Laboratoire de Physique des Matériaux, Faculté des Sciences de Sfax,

B. P. 802, 3018 Sfax -Tunisie

2 Laboratoire 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

Abstract

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.

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