Speaker
Ms
Saowalak Saengplot
(Program of Materials Science and Nanotechnology, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand)
Description
Magnetic nanocrytalline of La${}_{1-x-y}$Sr${}_x$Gd${}_y$MnO${}_3$ (LSGM) with $y$ = 0, 0.05, 0.10, 0.15 and 0.20 are synthesized by a thermal-hydro decomposition method at 800 ºC in air for 6 h. All samples are characterized by TG-DTA, XRD, SEM and VSM. The XRD result shows that all the prepared samples have perovskite structure with rhombohedral phase. The crystalline sizes are in the range of 18.1 – 21.1 nm, which increases with decreasing Gd content (y value). The SEM images of prepared samples show the spherical nanoparticles shape with agglomeration of particles. The VSM result shows soft-ferromagnetic behavior for all samples with the magnetization (M) value of 9.3– 34.6 emu/g. The M value decreases with increasing Gd content. The substitution for La by Gd with a smaller ionic size than La usually leads to a decreases of lattice parameters and decreases of crystalline sizes. The decrease of magnetization value with increasing Gd concentration associated distortion structure with high mismatch factor (σ2).
Author
Ms
Saowalak Saengplot
(Program of Materials Science and Nanotechnology, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand)
Co-author
Ms
Sujitra Daengsakul
(Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand)
