Structural and magnetic properties of nanocrystalline compounds of the general formula La1-xMnO3+δ have been investigated combining x-ray diffraction and x-ray absorption spectroscopy in order to achieve an accurate description of the sample atomic structure in relation with its magnetic properties. The study reveals the segregation of different phases instead of a homogeneous sample composition. Interesting is the segregation of a vacancy-doped phase LayMnO3 whose composition is the same (y∼0.9) for all the investigated samples, independently of the average sample composition. Since this phase is found to be principally responsible for the magnetic properties of these compounds, such a phase separation explains the largely composition-independent magnetic properties observed in the range 0.9>~La/Mn>~0.7.
G., D., M., A., H., V., Meneghini, C., E., D. (2004). Structural characterization of La_{1-x}MnO_{3-d} nanopowders by X-ray diffraction and X-ray absorption spectroscopy. PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, 69, 014412 [10.1103/PhysRevB.69.014412].
Structural characterization of La_{1-x}MnO_{3-d} nanopowders by X-ray diffraction and X-ray absorption spectroscopy
MENEGHINI, CARLO;
2004-01-01
Abstract
Structural and magnetic properties of nanocrystalline compounds of the general formula La1-xMnO3+δ have been investigated combining x-ray diffraction and x-ray absorption spectroscopy in order to achieve an accurate description of the sample atomic structure in relation with its magnetic properties. The study reveals the segregation of different phases instead of a homogeneous sample composition. Interesting is the segregation of a vacancy-doped phase LayMnO3 whose composition is the same (y∼0.9) for all the investigated samples, independently of the average sample composition. Since this phase is found to be principally responsible for the magnetic properties of these compounds, such a phase separation explains the largely composition-independent magnetic properties observed in the range 0.9>~La/Mn>~0.7.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
