(PLT) nanocrystalline powders were obtained by polymeric precursor method.
The samples were analyzed by differential scanning calorimetry (DSC) and thermogravimetry
(TG) techniques to characterize properly the distinct thermal events occurring
during synthesis. The X-ray diffraction patterns show a tetragonal structure
for the samples with x=0.10 and 0.15. An
increase of the lanthanum concentration to x=0.20
led to a highly symmetric structure, cubic on average. The powders obtained
at the end of the synthesis had an average particle size of 30 to 70 nm.