Improvement of some spectroscopic and physical properties of La1-xSrxFe1-yCoyO3 nanometric multiferroic

Abstract

structural, spectroscopic and physical properties of nano-sized particles of La1-xSrxFe1-yCoyO3; (x=0.3), (0≤y≤0.6) prepared using the flash auto combustion method reveled the following remarkable conclusion: 1- XRD assured that the samples of 0.0≤y≤0.3 annealed at 700 ̊C crystallized in a single phase perovskite orthorhombic structure. 2- The formation of the samples at 0.4≤y≤0.6 were accompanied by secondary phases of La3Co3O8, La2CoO4. Increasing the annealing temperature after 700 ̊C for this group of samples lead to chemical decomposition of the orthoferrite rather than forming single phase. 3- FTIR showed vibration modes of the compound which changed theire position and intensity depending on Co concentration. 4- Electrical conductivity increased with increasing Co concentration. 5- A notable increase in the conductivity at y=0.2 in presence of laser reached to 14% at 1000 kHz due to low porosity of this sample. 6- No remarkable change in the conductivity of samples y=0.1 and 0.3 was detected in presence of laser. 7- The magnetic parameters increased with Co2+doping for 0.0≤y≤0.2 due to increasing the canting angle; which enhances the ferromagnetic components obtained from (M-H) results. 8- By increasing Co2+content beyond y≥0.3, both cM and MS decrease due to the decrease of the tolerance factor and the formation of secondary Conclusion 217 phases which have paramagnetic character. 9- Electric and magnetic properties of this group showed that, the sample of y=0.2 is characterized by enhanced electrical conductivity in presences of laser than without laser, largest MS and smallest HC, accordingly, it is recommended for solid oxide fuel cells applications, and in many magnetic memory devices and modern hard disk drives.