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Praseodymium Deficiency Effects on the Physical Properties of Pr0.7−x□Sr0.3MnO3 Perovskite Manganites

✍ Scribed by W. Boujelben; A. Cheikh-Rouhou; J.C. Joubert

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
173 KB
Volume
156
Category
Article
ISSN
0022-4596

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✦ Synopsis

The praseodymium de5ciency e4ects on the structural, magnetic, and electrical properties of the lacunar perovskite manganite oxides Pr 0.7؊x ) x Sr 0.3 MnO 3 (04x40.23) have been investigated. This study is of great interest because it gives more information on the role of the Mn cation oxidation degree. Powder X-ray di4raction patterns are indexed in the rhombohedral perovskite structure with the R3 c space group for x ‫؍‬ 0 to 0.1 and in the orthorhombic one with the Pbnm space group for x ‫؍‬ 0.15 to 0.23. Magnetization and resistivity measurements versus temperature show that all of our samples exhibit a semiconducting paramagnetic+metallic ferromagnetic transition when the temperature decreases.

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