Title : Optical properties of Trivalent doped perovskite R1-xAxMnO3
Abstract:
The effect of gallium doping on the structural and optical properties of the La0.7K0.3Mn(1-x)GaxO3 (0≤x≤0.25) ceramics has been synthesized by pechini sol-gel method. The Rietveld refinements data revealed that all the samples have a rhombohedral structure with the space group R3 ?c. The SEM images recorded at different magnification levels reveal uniform grain shapes with flat surfaces .The optical properties indicated that the band gap of La0.7K0.3Mn(1-x)GaxO3 (0≤x≤0.25) ceramics was shifted from 3.2 to 3.08 eV with dopant concentration. These findings suggest that our material is highly preferred for practical applications like optoelectronic devices
Audience Take Away Notes :
- Recently, numerous investigations have been carried out on the mixed valence manganese perovskite R1-xAxMnO3 (R refers to rare earth elements and A to alkali elements) due to its attractive properties like the colossal magnetoresistance (CMR) effect and possible applications in uncooled infrared bolometers,microelectronic devices ,magnetic refrigeration ,supercapacitors and magnetic sensors .
- In order to understand the relation between the structural, magnetic, electrical and optical properties and the CMR of manganites doped with non-magnetic ions. In this context, we want to know how the presence of a nonmagnetic metal (Ga3+) at the Mn site affects the structural and optical properties of the compounds obtained by the Pechini method.
