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Ordering of Oxygen Vacancies and Magnetic Properties in La0.5Ca0.5MnO3−δ (0≤δ≤0.5)

✍ Scribed by J.M. González-Calbet; E. Herrero; N. Rangavittal; J.M. Alonso; J.L. Martı́nez; M. Vallet-Regı́

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
827 KB
Volume
148
Category
Article
ISSN
0022-4596

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✦ Synopsis

The study by electron di4raction and high resolution electron microscopy of several samples of the system La 0.5 Ca 0.5 MnO 3؊ , apart from strikingly con5rming the correctness of the orthorhombic perovskite-related unit cell of a+a c (2, b+a c (2, c+2a c for 04 40.25, points to the existence of three dimensional multitwinning which gives rise to an apparently double cubic cell. For ‫,5.0؍‬ the ordering of the anionic vacancies leads to a new material isostructural to Sr 2 FeO 5 and unit cell a ‫؍‬ 5.361(3), b ‫؍‬ 16.463(9), c ‫؍‬ 5.340(3) A s , space group Ibm2. The magnetic characterization of the three compositions has been carried out and related to the structure.

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Effects of the Oxygen Nonstoichiometry on the Physical Properties of La0.7Sr0.3MnO3−δ□δ Manganites (0≤δ≤0.15)
✍ N. Abdelmoula; K. Guidara; A. Cheikh–Rouhou; E. Dhahri; J.C. Joubert 📂 Article 📅 2000 🏛 Elsevier Science 🌐 English ⚖ 162 KB

We present the oxygen de5ciency e4ects on the structural, magnetic, and electrical properties in La 0.7 Sr 0.3 MnO 3؊ ) solution where ) is a vacancy and 04 40.15. Polycrystalline samples La 0.7 Sr 0.3 MnO 3؊ ) were synthesized by a new method. In this series of manganites the Mn 3؉ content is syste