Sol–Gel Synthesis, Characterization, and Magnetic Properties of Double-Layered Perovskite Manganite La1.25Sr1.75Mn2O7

Bilayered perovskite manganites of the composition La
_1.25
Sr
_1.75
Mn
₂
O
₇
(LSMO) were synthesized successfully by the sol–gel method. The effects of pH concentration, calcination temperature, and time on the phase formation, structure, and magnetic properties of the material were systematically investigated. X-ray diffraction and Rietveld refinement analysis revealed that the single phase of LSMO was only obtained in samples sintered at a temperature as high as 1250 °C. The best magnetic properties were achieved in samples with
\({\rm pH} = 7\)
, calcinated at 1450 °C for 10 h. Our studies show that the pH concentration, calcination temperature, and time are important factors in tailoring the magnetic properties of double-layered perovskite manganites.