Structural and Magnetic Properties of Microwave Assisted Sol-Gel Synthesized La0.9Sr0.1MnO3

Abstract

The structural and magnetic properties of nanoparticles of La 0.9 Sr 0.1 MnO 3 (LSMO) were studied using powder X-ray diffraction (XRD), transmission electron microscope (TEM), and magnetic measurements. The XRD refinement result indicates that samples crystallize in the rhombohedral structure with R-3C space group. The dc magnetization measurements revealed that samples exhibit no hysteretic behavior at room temperature, symptomatic of the superparamagnetic (SPM) behavior. The results of ac magnetic susceptibility measurements show that the susceptibility data are not in accordance with the Néel-Brown model for SPM relaxation but fit well with conventional critical slowing down model which indicates that the dipole-dipole interactions are strong enough to cause superspin-glass-like phase in LSMO samples.

Preparation of La0.7Ca0.3−xSrxMnO3 Manganites by Four Synthesis Methods and Their Influence on the Magnetic Properties and Relative Cooling Power

“…The solution was transferred to vials of an Anton Paar Multiwave PRO microwave system (Anton Paar, Graz, Austria), and the controlled-temperature reaction option was set at 250 °C for 1 hour. Subsequently, the reaction product was heated with a heating rate of 2 °C/min and maintained at 110 °C for 1 h; then, it was heated with a heating rate of 30 °C/min and maintained at 800 °C for 3 h. Finally, the powders were milled, pressed, and sintered at 900 °C/3h, 1000 °C/3h, 1100 °C/3h, and 1200 °C/3h [25].…”