INFLUENCE OF BALL MILLING PROCESS ON STRUCTURAL AND MAGNETIC PROPERTIES OF La sub( 0.7)Sr sub( 0.3)MnO sub( 3) MANGANITE

• Published in: Revista EIA no. 1; p. E31
• Main Authors: Figueroa, Gloria Campillo, Olmos, oscar Arnache, Garces, Andres Gil, Velez, Jaime Alberto Osorio, Beltran, Jailes Joaquin, Miranda, Eval Baca, Castillo, Roberto
• Format: Journal Article
• Language: English
• Published: 01.05.2014
• Subjects: Ball milling; Crystallites; Ferromagnetism; Homogeneity; Magnetic properties; Magnetization; Manganites; Scanning electron microscopy
• ISSN: 1794-1237; 1794-1237

This investigation presents the magnetic and structural properties of ferromagnetic manganite La0.7Sr0.3MnO3, (LSMO), subjected to ball milling processes. The LSMO powder sample was obtained by solid state reaction from high purity precursors. From X-ray diffraction (XRD), the sample showed the characteristic peaks of this phase. By means of thermogravimetric analysis assisted by magnetic field, used as first method to measure the Curie temperature TC, the NM (non-milling) LSMO powders exhibited a TC=369.69 K, which agrees with the magnetization measurements. In order to study size dependent properties, LSMO powder was subjected to mechanical milling processes during 3, 6 and 12 hours. From Rietveld refinement of XRD patterns, a reduction in crystallite average size and a stabilization of crystalline structure (the R3c space group), with milling time, were observed. These results are consistent with the Scanning Electron Microscopy (SEM) images, which showed more homogeneity in the grain distribution with longer milling times.