# Siam Physics Congress 2015

20-22 May 2015
Asia/Bangkok timezone
The Centennial Celebration of General Relativity Theory and 80 Years of Thai Physics Graduate

## Effect of Gd substitution for La on the structure and magnetic properties of the La${}_{1-x-y}$Sr${}_x$Gd${}_y$MnO${}_3$ nanoparticle

20 May 2015, 14:00
3h 30m
Board: MAG-03
Poster presentation Magnetic and Semiconductor Physics

### 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).

### Primary 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)

### Presentation Materials

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